Zeitschriftenartikel: „FEA validation“

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Panagiotopoulou, O., S. D. Wilshin, E. J. Rayfield, S. J. Shefelbine und J. R. Hutchinson. „What makes an accurate and reliable subject-specific finite element model? A case study of an elephant femur“. Journal of The Royal Society Interface 9, Nr. 67 (13.07.2011): 351–61. http://dx.doi.org/10.1098/rsif.2011.0323.

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Finite element modelling is well entrenched in comparative vertebrate biomechanics as a tool to assess the mechanical design of skeletal structures and to better comprehend the complex interaction of their form–function relationships. But what makes a reliable subject-specific finite element model? To approach this question, we here present a set of convergence and sensitivity analyses and a validation study as an example, for finite element analysis (FEA) in general, of ways to ensure a reliable model. We detail how choices of element size, type and material properties in FEA influence the results of simulations. We also present an empirical model for estimating heterogeneous material properties throughout an elephant femur (but of broad applicability to FEA). We then use an ex vivo experimental validation test of a cadaveric femur to check our FEA results and find that the heterogeneous model matches the experimental results extremely well, and far better than the homogeneous model. We emphasize how considering heterogeneous material properties in FEA may be critical, so this should become standard practice in comparative FEA studies along with convergence analyses, consideration of element size, type and experimental validation. These steps may be required to obtain accurate models and derive reliable conclusions from them.

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Acar, Dogan, Mevlut Turkoz, Hasan Gedikli und Omer Necati Cora. „Finite Element Analysis and Experimental Validation of Warm Hydromechanical Deep Drawing Process“. Applied Mechanics and Materials 686 (Oktober 2014): 535–39. http://dx.doi.org/10.4028/www.scientific.net/amm.686.535.

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This study intended to establish finite element analysis (FEA) model of warm hydro mechanical deep drawing process (WHMD) of cylindrical cups by means of commercial FEA package Ls-Dyna The validity of established FEA model is verified by means of WHMD experiments through several studies. It was noted that the established model successfully simulated the real process leading to significant cost and time spent on trial-error stage in hydromechanical deep-drawing of lightweight alloys.

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Kořínek, Jan. „Validation of Sinus Filter Choke Temperature Model“. TRANSACTIONS ON ELECTRICAL ENGINEERING 5, Nr. 2 (30.03.2020): 53–58. http://dx.doi.org/10.14311/tee.2016.2.053.

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<span lang="EN-GB">This article discusses the relationship between the losses of a sinus filter choke. Its influence on the loaded sinus filter temperature field distribution within and on the surface, verification of these performance and temperature relationships. It includes three-dimensional transient finite element analysis (FEA) of the sinus filter choke temperature conditions based on a mathematical description of the conduction, free convection and losses and describing temperature field validation methodology. In addition, there is shown mutual evaluation of the validation measurement and FEA simulation. Finally, there are outlined further options for the future optimisation of the sinus filter choke thermal simulation.</span>

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P. Hassan, Mohamed, Abdullah Saad Mahmud, A. S. M. Rafie und Rizal Zahari. „Alternative Numerical Validation Methodology for Short-Term Development Projects“. Applied Mechanics and Materials 564 (Juni 2014): 638–43. http://dx.doi.org/10.4028/www.scientific.net/amm.564.638.

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Virtual prototyping has been increasingly taking over the process of sole physical tests. Companies are reporting up to 80% reduction in errors when using virtual tests through the design process. Conventional numerical validation methodology however, is not as beneficial for short-term projects because any new numerical scenario has to be validated before being used. Although during the conceptual stage, relative values can be sufficient. The alternative methodology proposed also uses realistic loads. It comprise applying these loads on a functioning structure to verify them. The modified version of the structure is then relatively validated by being tested under these verified loads. Thus, bypassing the physical tests requirement. Aerodynamic loads are acquired from simulating the Gulfstream IV-SP forward fuselage during climbing, cruising and landing. Mechanical loads are acquired from estimating structural weight and impact load during landing. In total, three finite element models were created. Autodesk softwares were used to perform CFD and FEA. Only greater loads were applied during FEA. Results simplified neglected cruising data for having lowest values. Comparing estimated weights of functional and modified structures showed a possible 15% weight savings. While the FEA results showed a promising 45% less inquired stress within the modified structure.

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De Strycker, Maarten, Pascal Lava, Wim Van Paepegem, Luc Schueremans und Dimitri Debruyne. „Validation of Welding Simulations Using Thermal Strains Measured with DIC“. Applied Mechanics and Materials 70 (August 2011): 129–34. http://dx.doi.org/10.4028/www.scientific.net/amm.70.129.

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Residual stresses can affect the performance of steel tubes in many ways and as a result their magnitude and distribution is of particular interest to many applications. Residual stresses in cold-rolled steel tubes mainly originate from the rolling of a flat plate into a circular cross section (involving plastic deformations) and the weld bead that closes the cross section (involving non-uniform heating and cooling). Focus in this contribution is on the longitudinal weld bead that closes the cross section. To reveal the residual stresses in the tubes under consideration, a finite element analysis (FEA) of the welding step in the production process is made. The FEA of the welding process is validated with the temperature evolution of the thermal simulation and the strain evolution for the mechanical part of the analysis. Several methods for measuring the strain evolution are available and in this contribution it is investigated if the Digital Image Correlation (DIC) technique can record the strain evolution during welding. It is shown that the strain evolution obtained with DIC is in agreement with that found by electrical resistance strain gauges. The results of these experimental measuring methods are compared with numerical results from a FEA of the welding process.

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Bright, Jen A. „A review of paleontological finite element models and their validity“. Journal of Paleontology 88, Nr. 4 (Juli 2014): 760–69. http://dx.doi.org/10.1666/13-090.

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Finite element analysis (FEA) is a powerful quantitative tool that models mechanical performance in virtual reconstructions of complex structures, such as animal skeletons. The unique potential of FEA to elucidate the function, performance, and ecological roles of extinct taxa is an alluring prospect to paleontologists, and the technique has gained significant attention over recent years. However, as with all modeling approaches, FE models are highly sensitive to the information that is used to construct them. Given the imperfect quality of the fossil record, paleontologists are unlikely to ever know precisely which numbers to feed into their models, and it is therefore imperative that we understand how variation in FEA inputs directly affects FEA results. This is achieved through sensitivity and validation studies, which assess how inputs influence outputs, and compare these outputs to experimental data obtained from extant species. Although these studies are restricted largely to primates at present, they highlight both the power and the limitations of FEA. Reassuringly, FE models seem capable of reliably reproducing patterns of stresses and strains even with limited input data, but the magnitudes of these outputs are often in error. Paleontologists are therefore cautioned not to over-interpret their results. Crucially, validations show that without knowledge of skeletal material properties, which are unknowable from fossilized tissues, absolute performance values such as breaking stresses cannot be accurately determined. The true power of paleontological FEA therefore lies in the ability to manipulate virtual representations of morphology, to make relative comparisons between models, and to quantitatively assess how evolutionary changes of shape result in functional adaptations.

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L'Anson, R., J. Peña, R. Postic und J.-P. Barret. „Finite Element Analysis Applied to Radial Aircraft Tyre Engineering“. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 210, Nr. 1 (Januar 1996): 109–16. http://dx.doi.org/10.1243/pime_proc_1996_210_349_02.

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The application of finite element analysis (FEA) to the design of radial aircraft tyres is shown to be an effective and efficient tool which can be used for conducting tyre and tyre wheel design studies. This paper describes the specific conditions under which FEA is applied by Michelin to the radial aircraft tyre, and presents an example of its application to the analysis of the tyre and wheel rim contact pressures. Model definition, calculated tyre displacement and rim contact pressure distributions are included. Validation of the FEA prediction against experimental results is demonstrated for a main landing gear tyre.

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Kim, Hong Seok, Muammer Koç, Jun Ni und Amit Ghosh. „Finite Element Modeling and Analysis of Warm Forming of Aluminum Alloys—Validation Through Comparisons With Experiments and Determination of a Failure Criterion“. Journal of Manufacturing Science and Engineering 128, Nr. 3 (19.09.2005): 613–21. http://dx.doi.org/10.1115/1.2194065.

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In this study, thermomechanically coupled finite element analysis (FEA) was performed for forming aluminum rectangular cups at elevated temperatures. In order to identify the onset of a failure during FEA, applicability, accuracy, and repeatability of three different failure criteria (maximum load, minimum thickness, and thickness ratio) were investigated. The thickness ratio criterion was selected since it resulted in accurate prediction of necking-type failure when compared with experimental measurements obtained under a variety of warm forming conditions. Predicted part depth values from FEA at various die-punch temperature combinations and blank holder pressures conditions were also compared with experiments, and showed good agreement. Forming limit diagrams were established at three different warm forming temperature levels (250°C, 300°C, and 350°C). An increasing limiting strain was observed with increasing forming temperature both in FEA and experiments. In addition, strain distributions on the formed part obtained under different die-punch temperature combinations were also compared to further validate the accuracy of FEA. A high temperature gradient between die and punch (Tdie>Tpunch) was found to result in increased formability; i.e., high part depths.

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Tarfaoui, Mostapha, und Papa Birame Gning. „Experimental Investigation and Finite Element Analysis of Dynamic Behavior and Damage of Glass/Epoxy Tubular Structures“. Key Engineering Materials 471-472 (Februar 2011): 951–56. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.951.

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This paper presents finite element analysis (FEA) of static and dynamic tests of thick filament wound glass/epoxy tubes. The first part involves the validation of elastic properties and identification of damage initiation and its development in dynamic tests. The results of FEA of the dynamic tests without damage appeared satisfactory. An impact model, including material property degradation, is used for damage prediction. The simulated damage is compared with that obtained experimentally. The sizes of projected and cumulated surfaces are of the same order of magnitude as in the experimental measurements.

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Zhang, Peng, Song He, Michael C. Muir und G. S. J. Gautam. „Eccentricity Effects on NVH Performance of Interior Permanent Magnets Machines for Hybrid and Electric Vehicles“. INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, Nr. 4 (01.08.2021): 2384–92. http://dx.doi.org/10.3397/in-2021-2124.

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For the hybrid electric vehicles (HEVs) and electric vehicles (EVs) applications, the electric machine drive unit system provides the main noise source, especially in the presence of faults. Eccentricity is one of the most common faults, which is mainly caused by the motors' package design and assembling process. There are four main types of eccentricity for motors: static offset, dynamic offset, static tilt and dynamic tilt, which are presented and analyzed. Both two-dimensional (2D) and 3-dimentional (3D) finite element analysis (FEA) are utilized in the electromagnetic field analysis for an Interior Permanent Magnet (IPM) motor. The corresponding methodologies for the mesh and force mapping to the mechanical FEA for the NVH analysis are presented. The NVH test shows that both 2D and 3D FEA can provide reasonable accuracy for the motor eccentricity fault analysis. The 2D FEA is the most common method used in the design optimization and early performance prediction for electrical. For the 3D FEA, due to the high requirement for the computer hardware and computation capability, it is usually used in the final validation for electrical machines' performance. The sensitivity of motor performance versus the airgap heights and eccentricities are studied.

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Manea, Ion, Ioan Sebesan, Mihai Matache, Gabriel Prenta und Catalin Firicel. „Use of the experimental modal analysis for analytical lifetime estimation of a bogie frame“. MATEC Web of Conferences 178 (2018): 06018. http://dx.doi.org/10.1051/matecconf/201817806018.

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The fatigue strength validation by tests of the railway bogie frames requires existence of an expensive laboratory and a long time for testing of about 6 to 10 months. Considering these aspects, the European norms admit that fatigue tests can be replaced by finite elements analysis (FEA), with the condition that analytical model to be correctly realized and validated by tests. Experimental modal analysis (EMA) provides a powerful tool for validation of the FEA model by experimental data. The article presents an application for assessment of the fatigue strength of a three-axle locomotive bogie frame. Using Ansys, was carried out the structural analysis of the bogie frame, resulting the modal model characterized by the modal parameters: Eigen frequencies and Eigen shapes. The analytical model was validated by an EMA application carried out on the bogie frame and correlation analysis of the EMA and FEA models. Using a special measuring wheel set, were determined the wheelrail interaction forces for various locomotive running conditions. The analytical structural model, validated through experimental data, and the data files containing the wheel-rail interaction forces, constitutes the input data for the nCode program that evaluates the bogie frame lifetime using appropriate stress curves and a recognized accumulation of damage hypothesis, e.g. the Palmgren-Miner.

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Acquaviva, Alessandro, Stefan Skoog, Emma Grunditz und Torbjörn Thiringer. „Electromagnetic and Calorimetric Validation of a Direct Oil Cooled Tooth Coil Winding PM Machine for Traction Application“. Energies 13, Nr. 13 (30.06.2020): 3339. http://dx.doi.org/10.3390/en13133339.

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Tooth coil winding machines offer a low cost manufacturing process, high efficiency and high power density, making these attractive for traction applications. Using direct oil cooling in combination with tooth coil windings is an effective way of reaching higher power densities compared to an external cooling jacket. In this paper, the validation of the electromagnetic design for an automotive 600 V, 50 kW tooth coil winding traction machine is presented. The design process is a combination of an analytical sizing process and FEA optimization. It is shown that removing iron in the stator yoke for cooling channels does not affect electromagnetic performance significantly. In a previous publication, the machine is shown to be thermally capable of 25 A/mm 2 (105 Nm) continuously, and 35 A/mm 2 (140 Nm) during a 10 s peak with 6 l/min oil cooling. In this paper, inductance, torque and back EMF are measured and compared with FEA results showing very good agreement with the numerical design. Furthermore, the efficiency of the machine is validated by direct loss measurements, using a custom built calorimetric set-up in six operating points with an agreement within 0.9 units of percent between FEA and measured results.

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Sharma, Dheeraj Kumar, Mainak Bandyopadhyay, Jaydeep Joshi und Arun K. Chakraborty. „Determination of Residual Stresses in Ceramic-Metal Brazed Joint using Finite Element Analysis (FEA) and Experimental Validation of the Results“. SAMRIDDHI : A Journal of Physical Sciences, Engineering and Technology 12, Nr. 01 (30.06.2020): 1–7. http://dx.doi.org/10.18090/samriddhi.v12i01.1.

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Ceramic vacuum feedthroughs are an inevitable requirement for any vacuum system which requires electrical feedlines to be inserted into the vacuum environment. These feedthroughs consist of metal-ceramic-metal transition and, therefore, require the brazing process as a joining technique. This process allows joining two base materials, i.e., Alumina and Kovar, for this case, which manifests different thermo-mechanical response. The difference between the coefficient of thermal expansion (CTE) of these materials causes the development of residual stresses during the cooling phase of the brazing process. Such residual stresses, if not addressed properly, can lead to the failure in the brazed joint even before the design limits. The purpose of this study is to assess these stresses by performing the thermo-mechanical analysis of the brazing process of ceramic-metal assembly through finite element analysis (FEA) technique. This study includes the assessment of non-linear behavior (due to temperature-dependent material properties) of Alumina and Kovar assembly. Further, X-ray diffraction (XRD) based residual stress measurement technique has been utilized to validate the FEA results. The paper shall present the FEA methodology (model, boundary condition, and results) followed by the experimental results and their comparison.

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Voskresenskiy, Michail, Victor Mikhaylov und Oleg Pakhmurin. „Modelling and validation of dynamic parameters and material heterogeneous damping properties of foundation structures and subsoils“. EPJ Web of Conferences 221 (2019): 01008. http://dx.doi.org/10.1051/epjconf/201922101008.

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In this paper, an integrated technology for performing finite element calculations in SCAD Office FEA-software with instrumental verification of actual dynamic characteristics of load-bearing structures and subsoils with the use of seismic hardware-software complex REGISTR is proposed.

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Xia, Lei, und Haobin Jiang. „Design and Steady-State Performance of a Novel Winding Type Permanent Magnet Coupling with Slip Power Recovery Function“. Mathematical Problems in Engineering 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/3141089.

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A novel winding type permanent magnet coupling (WTPMC) is proposed to work as an adjustable speed drive with slip power recovery function. As a kind of dual-mechanical-port electric machine with radial-flux configuration, the WTPMC consists of an outer rotor embedded with three-phase windings, an inner rotor populated with permanent magnets, and a slip power recovery circuit comprising a rectifier, a boost converter, and an ultracapacitor. The working principle of the WTPMC is presented, and its mathematical model is derived. To develop a WTPMC prototype for automotive applications, two-dimensional (2D) finite element analysis (FEA) is conducted using Ansoft Maxwell software to study the steady-state (constant slip speed) performance. For the experimental validation, the WTPMC prototype is manufactured and tested on a test bench. To show the accuracy of the 2D FEA, the computed results are compared with those obtained from experimental measurements. It is shown that the agreement between the 2D FEA and experimental results is good. Moreover, the WTPMC prototype can operate in the output speed range under different load torque conditions. The slip power recovery efficiency for the 2D FEA is 66.7%, while, for experimental measurements, it is 57.2%.

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Rai, Praveen Kumar, Vinod Yadava und Rabindra Kumar Patel. „Computer-Aided Design of Bezier Horns Using Finite Element Analysis for Rotary Ultrasonic Machine“. Journal of Advanced Manufacturing Systems 19, Nr. 03 (September 2020): 517–41. http://dx.doi.org/10.1142/s0219686720500250.

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In this paper, a finite element analysis (FEA) has been used for the design of horn with different Bezier profiles for rotary ultrasonic machine (RUM). First, for validation, the results are compared with available literature. FEA-based MATLAB code is developed for finding the stress components, axial amplitude, and resonance frequency over the domain of horn with different Bezier profiles. In domain of horn with different Bezier profiles, the component of stresses is studied and found that the stress generated is within the endurance strength of the selected material. The amplification of the proposed horns is 24%, and 18% higher than the traditional linear Bezier horn with same length and diameters of surface end. For RUM, effect of inertia (self-weight or gravity of horn) on domain has been studied for horn with different Bezier profiles using FEA. The effect of tool shape and size on the stress distribution for horn have also been studied.

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Mayank Laddha et al.,, Mayank Laddha et al ,. „The FEA Validation of Side Underrun Protection Device (SUPD) for Heavy Commercial Vehicles“. International Journal of Mechanical and Production Engineering Research and Development 9, Nr. 4 (2019): 263–68. http://dx.doi.org/10.24247/ijmperdaug201927.

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Desai, Sumit, Amit Desai und Vijaykumar Karande. „Design and weight optimization of buffer relief valve using FEA with experimental validation“. Materials Today: Proceedings 27 (2020): 1466–72. http://dx.doi.org/10.1016/j.matpr.2020.02.959.

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Liao, Y. Gene. „FEA-based prediction and experimental validation of clutch transient temperature in automatic transmission“. International Journal of Vehicle Design 43, Nr. 1/2/3/4 (2007): 1. http://dx.doi.org/10.1504/ijvd.2007.012292.

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Jónás, Szabolcs, und Miklós Tisza. „Determination of different parameters to high strength steel clinch joints by FEA“. International Journal of Engineering and Management Sciences 4, Nr. 1 (03.03.2019): 341–47. http://dx.doi.org/10.21791/ijems.2019.1.42.

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In this article the clinched joints were analyzed by finite element method (FEA). The base materials were advanced high strength steels (DP 600, DP 800 and DP 1000). The model validation procedure was done by the DP 600 type of steel sheets; the other two types of steel were only simulated. The goal was to determine the geometrical properties of the joints with different strength steels. The FEA model was the same in every mechanical point of view therefore the results are comparable. The main geometrical parameters of the clinch joints are the neck thickness (tN), the undercut (C), the bottom thickness (tB) and the height of the protrusion (h); these values were compared.

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Cecchel, Ferrario, Mega und Cornacchia. „Correlation between Numerical and Experimental Structural Resistance of a Safety Relevant Aluminum Automotive Component“. Metals 9, Nr. 9 (29.08.2019): 949. http://dx.doi.org/10.3390/met9090949.

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Accurate implementation of weight reduction for the development of innovative safety-relevant components, such as suspension assemblies, requires a careful evaluation of the structural resistance. The validation of these critical parts usually employs Finite Element Analysis (FEA) during the design phase and laboratory tests on prototypes during later stages. However, the results of these established methods have rarely been numerically compared. The present paper introduces a method for comparing FEA and testing, based on the elaboration of micro-strains acquired with strain gauges positioned in specific regions. The model was applied to the real case study of an innovative lightweight cross beam. FEA simulations and bench tests under different conditions that were representative of the operating environments were carried out. Two different relevant configurations of fatigue bench tests were considered. Then, the data obtained from testing were numerically elaborated in order to compare them with the analytical results. Real data from in-field measurements were used. The cross beam endured at the elevate mission loads reproduced at the bench test. The FEA and testing results were aligned. The correlation method was proven to be reliable, since it made it possible not only to numerically evaluate the testing output, but also to validate the calculation tools, and it could be extended to similar applications in future.

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Croitoru, Emilian Ionut, Gheorghe Oancea und Nicolae Constantin. „Impact Testing on Composite Panels of Fiberglass, Carbon and Kevlar-Carbon A comparison and validation study“. Materiale Plastice 54, Nr. 4 (30.12.2017): 700–707. http://dx.doi.org/10.37358/mp.17.4.4928.

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A validation study between finite element analysis and experimental testing considering an impact loading of Fiberglass, Carbon and Kevlar-Carbon composite panels of 150 x 100 mm2 was conducted by the authors. Using the design of experiments method and the Design Expert software tool, the data obtained in FEA environment is validated, through means of statistical distributions, by the experimental tests results.

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He, Jia Yuan, Yan Wang und Nabil Gindy. „Investigation of Fixture Design Exploring Pre-Tensioning Forces“. Advanced Materials Research 97-101 (März 2010): 3252–55. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.3252.

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Pre-tensioning forces are, in essence, the selective application of clamping forces applied prior to processess to create a “stress field” envelope that aids the processes of components. There are many potential functions of applying pre-tensioning forces, such as improvement of component rigidity, reduction of machining deflection, and holding of components to counteract the machining forces etc. However, the use of pre-tensioning forces has not been extensively and comprehensively investigated. The aim of this paper is to strengthen the understanding of the impact of applying pre-tensioning forces firstly on simple parts and specifically on the fixture design development by establishing a methodology of using pre-tensioning forces. To investigate the optimised fixture layout and clamping strategy, Finite Element Analyses (FEA) were established to show the effect of applying pre-tensioning forces on machining deflection. Meanwhile, the relevant model validation experiments were applied to verify the FEA models in this study appropriately. Eventually, the results show that the FEA simulations are sufficient and the use of pre-tensioning forces effectively reduces the machining deflection by using optimised clamping strategy.

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Mansour, Khaled F., James A. Rowley und M. Safwan Badr. „Measurement of pharyngeal cross-sectional area by finite element analysis“. Journal of Applied Physiology 100, Nr. 1 (Januar 2006): 294–303. http://dx.doi.org/10.1152/japplphysiol.00364.2005.

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A noninvasive measurement of pharyngeal cross-sectional area (CSA) during sleep would be advantageous for research studies. We hypothesized that CSA could be calculated from the measured pharyngeal pressure and flow by finite element analysis (FEA). The retropalatal airway was visualized by using a fiber-optic scope to obtain the measured CSA (mCSA). Flow was measured with a pneumotachometer, and pharyngeal pressure was measured with a pressure catheter at the palatal rim. FEA was performed as follows: by using a three-dimensional image of the upper airway, a mesh of finite elements was created. Specialized software was used to allow the simultaneous calculation of velocity and area for each element by using the measured pressure and flow. In the development phase, 677 simultaneous measurements of CSA, pressure, and flow from one subject during non-rapid eye movement (NREM) and rapid eye movement (REM) sleep were entered into the software to determine a series of equations, based on the continuity and momentum equations, that could calculate the CSA (cCSA). In the validation phase, the final equations were used to calculate the CSA from 1,767 simultaneous measurements of pressure and flow obtained during wakefulness, NREM, and REM sleep from 14 subjects. In both phases, mCSA and cCSA were compared by Bland-Altman analysis. For development breaths, the mean difference between mCSA and cCSA was 0.0 mm2 (95% CI, −0.1, 0.1 mm2). For NREM validation breaths, the mean difference between mCSA and cCSA was 1.1 mm2 (95% CI 1.3, 1.5 mm2). Pharyngeal CSA can be accurately calculated from measured pharyngeal pressure and flow by FEA.

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Ion, Manea, Sebesan Ioan, Matache Mihai, Prenta Gabriel und Firicel Catalin. „Analytical evaluation of the lifetime of a three-axle bogie frame using the analytical model validated through experimental modal analysis“. MATEC Web of Conferences 211 (2018): 06004. http://dx.doi.org/10.1051/matecconf/201821106004.

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The fatigue strength validation by tests of the railway bogie frames requires existence of an expensive laboratory and a long time for testing, of about 6 to 10 months. Considering these aspects, the european norms admit that fatigue tests can be replaced by finite elementes analysis, with condition that analytical model to be correctly realized and validated by tests. Experimental modal analysis provides a powerful tool for validation of the FEA model through experimental data. The article presents an application for analytical assessment of the fatigue strength for a three-axle locomotive bogie frame, before sending it to the laboratory fatigue tests. Using Ansys, it was carried out the structural analysis of the bogie frame, rezulting the modal model characterized by the modal parameters: eigenfrequencies and eigenshapes. The analytical model was validated through an EMA application carried out on the bogie frame and correlation analysis of the EMA and FEA models. The analytical model and data files containing the simulated vertical, transverse and twist loads, applied to the bogie frame according to EN13749/2011, constitutes the input data for nCode program, that evaluates the bogie frame lifetime using appropriate stress curves and a recognized hypothesis of damage accumulation.

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Abambres, Miguel, und Mário Rui Arruda. „Finite element analysis of steel structures – a review of useful guidelines“. International Journal of Structural Integrity 7, Nr. 4 (08.08.2016): 490–515. http://dx.doi.org/10.1108/ijsi-07-2015-0020.

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Purpose – Since the use of advanced finite element analysis (FEA) in the design of steel structures has been increasing its popularity in order to avoid unsafe or highly conservative designs, a solid know-how in computer-aided design (CAD) and engineering (CAE) codes is necessary. Therefore the purpose of this paper is to provide an extensive review of useful guidelines concerning modelling, simulation and result validation for the accurate performance of those analyses. Design/methodology/approach – Such guidelines are obtained from international steel design codes like Eurocode 3 and DNV, publications from experienced CAE engineers and renowned FE software companies like Ansys and Altair. Topics like mesh independence, the effect of the load sequence on the load bearing capacity and steel fracture criteria are underlined. Findings – Since the use of advanced FEA in the design of steel structures is becoming more and more traditional due to the increase of its competitiveness when compared to the use of (very) conservative design rules, a solid know-how in CAD and CAE codes is necessary. Practical implications – This work will be quite useful for structural steel stress engineers, contributing for a safer use of FEA in research and design. Originality/value – This work will be quite useful for structural steel stress engineers, contributing for a safer use of FEA in research and design.

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Viceconti, M., M. Baleani, A. De Lollis und A. Toni. „An FEA-based protocol for the pre-clinical validation of custom-made hip implants“. Journal of Medical Engineering & Technology 22, Nr. 6 (Januar 1998): 257–62. http://dx.doi.org/10.3109/03091909809010008.

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Tzotzis, Anastasios, César García-Hernández, José-Luis Huertas-Talón und Panagiotis Kyratsis. „CAD-Based Automated Design of FEA-Ready Cutting Tools“. Journal of Manufacturing and Materials Processing 4, Nr. 4 (01.11.2020): 104. http://dx.doi.org/10.3390/jmmp4040104.

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The resources of modern Finite Element Analysis (FEA) software provide engineers with powerful mechanisms that can be used to investigate numerous machining processes with satisfying results. Nevertheless, the success of a simulation, especially in three dimensions, relies heavily on the accuracy of the cutting tool models that are implemented in the analyses. With this in mind, the present paper presents an application developed via Computer-Aided Design (CAD) programming that enables the automated design of accurate cutting tool models that can be used in 3D turning simulations. The presented application was developed with the aid of the programming resources of a commercially available CAD system. Moreover, the parametric design methodology was employed in order to design the tools according to the appropriate standards. Concluding, a sample tool model was tested by performing a number of machining simulations based on typical cutting parameters. The yielded results were then compared to experimental values of the generated machining force components for validation. The findings of the study prove the functionality of the tool models since a high level of agreement occurred between the acquired numerical results and the experimental ones.

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Idris Abdalla, Izzeldin, Taib Ibrahim und Nursyarizal bin Mohd Nor. „Design Validation of a Moving-Magnet Tubular Linear Permanent Magnet Motor with a Trapezoidal Permanent Magnet Shape“. Applied Mechanics and Materials 793 (September 2015): 274–79. http://dx.doi.org/10.4028/www.scientific.net/amm.793.274.

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This paper presents the design validation and optimization of a moving-magnet tubular linear permanent magnet motor (TLPMM) with a trapezoidal permanent magnets shape. The design optimization was implemented by two-dimensional Finite-Element Analysis (2-D FEA) and the validation has been established by using Matlab M-file. The proposed motor has been designed to produce 85 W output power which is enough to operate the linear reciprocating compressor of a household refrigerator system. The purpose of optimization is to achieve maximum efficiency and minimum losses, where the angle of PMs (β) and split-ratio (Rm/Re) after optimization the motor produce the highest efficiency of 93.8 %.

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Ayub, Tehmina, Sadaqat Ullah Khan und Nasir Shafiq. „Flexural Modelling and Finite Element Analysis of FRC Beams Reinforced with PVA and Basalt Fibres and Their Validation“. Advances in Civil Engineering 2018 (2018): 1–18. http://dx.doi.org/10.1155/2018/8060852.

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A flexural capacity model for fibre-reinforced concrete (FRC) beams reinforced with PVA and basalt fibres is suggested for the rectangular beam sections. The proposed models are based on the concept of equivalent stress block parameters for both compressive and tensile stresses, similar to Eurocode and ACI code. The parameters are defined by allowing the conversion of the stress-strain models into equivalent rectangular stress blocks, similar to Eurocode 2. The flexural model is suggested to determine the loading capacity of 21 FRC beams containing up to 3% volume fraction of PVA and basalt fibres without reinforcing bars. In order to investigate the accuracy of the proposed flexure models, finite element analysis (FEA) of the same beams was carried out using the compressive and tensile stress-strain curves. Furthermore, 21 FRC beams subjected to three-point bending were tested. The results of the flexural models showed good agreement with the load-carrying capacity of the tested FRC beams, and the results of FEA of all beams showed a good correlation with the experimental results in terms of the maximum load, load versus midspan deflection patterns, and the maximum tensile strains.

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Yu, Xian Zhong, Gang Jie, Ping Hui Huang und Si Cheng Tang. „Fatigue Life Prediction of Driving Axle Housing Assemble Based on FEA“. Advanced Materials Research 179-180 (Januar 2011): 1217–22. http://dx.doi.org/10.4028/www.scientific.net/amr.179-180.1217.

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Based on the uncertain problem during the design of the fatigue life of drive axle housing assemble, entity model of drive axle housing assemble of some commercial vehicle is built by UG. According to national standard of the Bench Test, with finite element method, the finite element model is built and the static strength analysis is made by the FEM-software ABAQUS 6.8. On the base of the result of stress-strain analysis and the model validation, with the fatigue software FEMFAT 4.7D, the research on the cumulative damage and endurance limit safety factors is studied in terms of the Miner modified fatigue theory in the drive axle housing assemble. The results show that the model and method is reasonable and effective. It is helpful to optimize the structure parameter in the drive axle design through the optimization algorithm in the automobile.

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Xia, Jun Yong, Hong Xiao Hao, Xiang Liang Ning, Yu Xin Hu, Shi Heng Li und Xin Yun Leng. „The Principle of Equivalent Center of Mass of FPB & Superstructure“. Advanced Materials Research 594-597 (November 2012): 982–86. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.982.

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Elaborates on the differences between FPB structure in practical uses and classical models, and puts forward a principle of equivalent center of mass of FPB & superstructure by dynamic analysis. It conducts FEA and experimental validation based on the post yield stiffness and vertical displacement calculated in accordance with the principle. The conclusion states that calculating the post yield stiffness and vertical displacement of the bearing by the principle is more accurate than before.

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R., Prithvirajan, Sugavaneswaran M., Sathishkumar N. und Arumaikkannu G. „Metal bellow hydroforming using additive manufactured die: a case study“. Rapid Prototyping Journal 25, Nr. 4 (13.05.2019): 765–74. http://dx.doi.org/10.1108/rpj-07-2018-0182.

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Purpose Custom-designed metal bellows require alternate ways to produce the die to shorten lead time. The purpose of this study is to explore the possibility of using Additive Manufactured (AM) polymer die as direct rapid tool (RT) for metal bellow hydroforming. Design/methodology/approach Finite element analysis (FEA) was used to simulate bellow forming and to evaluate the compatibility of AM die. Fused deposition modelling (FDM) technique is used to fabricate die with Acrylonitrile Butadiene Styrene (ABS) material. To validate, the width of the metal bellow convolutions obtained from the FEA simulation is compared with convolution formed during the experiment. Findings FDM-made die can be used for a short production run of bellow hydroforming. FEA simulation shows that stress developed in some regions of die is less and these regions have potential for material reduction. Use of RT for this particular application is limited by the die material, forming pressure, width, convolution span and material of bellow. This supports the importance of FEA validation of RT before fabrication to evaluate and redesign die for the successful outcome of the tool. Research limitations/implications The given methodology may be followed to design a RT with minimum material consumption for bellow forming application. Whenever there is a change in bellow design or the die material, simulation has to be done to evaluate the capability of the die. As this study was focused on a short production run for manufacturing one or few bellows, the die life is not a significant factor. Originality/value This paper demonstrates about rapid tooling for metal bellow manufacturing using FDM technique for low volume production. Further, FEA is used to identify low stress regions and redesign the die for material reduction before die manufacturing. AM die can be used for developing customized metal bellow for applications such as defense, aerospace, automobiles, etc.

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Meguid, S. A., G. Shagal und J. C. Stranart. „Development and Validation of Novel FE Models for 3D Analysis of Peening of Strain-Rate Sensitive Materials“. Journal of Engineering Materials and Technology 129, Nr. 2 (17.08.2006): 271–83. http://dx.doi.org/10.1115/1.2712469.

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In this paper, we provide two different symmetry cells to describe the shot-peening process. In this multiple impingement model, we study the dynamic behavior of TI-6Al-4V targets subjected to a large number of shots. Three-dimensional elastoplastic finite element analysis (FEA) of the process was conducted using these two symmetry cells for strain-rate sensitive targets and rigid shots. The basic symmetry cell is assigned a target surface area C×C, where C is one half of separation distance between adjacent shots. The second “enhanced” symmetry cell is assigned a target surface area 2C×2C thus allowing higher density of impact point locations. Average residual stresses inside the target predicted by FEA were compared with experimental measurements using the hole-drilling technique. In order to do this, a new averaged technique was developed to obtain the stress distribution inside the symmetry cell. The results reveal that both symmetry cell models could be used for shot-peening modeling. However, the use of the enhanced symmetry cell leads to a better agreement with the measured residual stresses. In addition, the enhanced symmetry cell model allowed us to overcome some of the shortcomings of the basic symmetry cell for cases involving high peening velocity and intensity.

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M., SIVARAMAKRISHNAIAH, KUMAR P. NANDA und JANARDHANA G. RANGA. „Prediction of Cutting Forces in Turning of AISI-4140 Steel Using FEA and Experimental Validation“. i-manager’s Journal on Mechanical Engineering 6, Nr. 1 (2016): 24. http://dx.doi.org/10.26634/jme.6.1.3738.

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36

Patil, Mr Ranjeet. „Fea Based Validation of Weld Joints to Determine Effect of Overlap Length of Weld Strength“. IOSR Journal of Mechanical and Civil Engineering 2, Nr. 2 (2012): 38–43. http://dx.doi.org/10.9790/1684-0223843.

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37

Phadatare, V. D. „Performance Improvement of Bus Structure for Rollover Analysis Using FEA and Validation of Roll Bar“. IOSR Journal of Mechanical and Civil Engineering 17, Nr. 10 (März 2017): 16–19. http://dx.doi.org/10.9790/1684-17010041619.

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38

Rebhi, Rabeb, Amina Ibala und Ahmed Masmoudi. „FEA-based investigation of the generating capability of a novel hybrid excited claw pole alternator with improved cost-effectiveness“. COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, Nr. 5 (26.08.2014): 1642–52. http://dx.doi.org/10.1108/compel-10-2013-0337.

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Purpose – The purpose of this paper is to investigate the generating capability of a novel hybrid excited brushless claw pole alternator (HEBCPA) with improved cost-effectiveness gained thanks to the substitution the rotor NdFeB-made permanent magnet (PM) with ferrite ones. Design/methodology/approach – The investigation of the magnetic features of the novel HEBCPA has been carried out using a 3D finite element analysis (FEA). Findings – It has been found that the machine generating capability is not affected by the substitution of the single rotor NdFeB-made PM by stator and rotor ferrite-made ones, which represents a crucial cost benefit. Research limitations/implications – An experimental validation of the features computed by FEA shall be considered as an outlook of the present work. Practical implications – The novel HEBCPA could be of great interest for automotive generating systems. Originality/value – The proposed HEBCPA with ferrite-made PMs is a novel concept.

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Lee, Yong Taeg, Tae Soo Kim, Jin Seong Lim und Seung Hun Kim. „Finite Element Analysis on Structural Behaviours of Single Shear Cold-Formed Stainless Steel Bolted Connections with Two Bolts“. Key Engineering Materials 452-453 (November 2010): 613–16. http://dx.doi.org/10.4028/www.scientific.net/kem.452-453.613.

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The experimental research for single shear bolted connection of cold-formed stainless steel fabricated with two bolts (2×1 bolt arrangement) has been conducted by T.S. Kim etc. Plate thickness and end distance parallel to the direction of loading was considered as main variables. It is found that the curling occurred easily in bolted connections with a long end distance and thinner plate. In this paper, finite element analysis study has been performed in order to compare test results with the predicted results and to investigate in detail the ultimate strength and curling influence. Finite element analysis(FEA) procedures also were introduced. FE models of connections with restrained out of plane deformation were also simulated for comparison with the curled models. Therefore, the validation of FEA in predicting ultimate strength and curling behavior was verified and the strength reduction ratio caused by curling was estimated.

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Wang, Shijie, Zhidan Weng und Bo Jin. „A Performance Improvement Strategy for Solenoid Electromagnetic Actuator in Servo Proportional Valve“. Applied Sciences 10, Nr. 12 (25.06.2020): 4352. http://dx.doi.org/10.3390/app10124352.

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This study presents a simulation model, optimization strategy and the experimental validation of a solenoid electromagnetic actuator that is widely used in industry components, especially in pneumatic/hydraulic valves. In the preliminary design, a two-dimensional magnetostatic finite element analysis (FEA) model is proposed and verified by static push-force comparisons between the two-dimensional FEA model, the three-dimensional FEA model and the experimental results. Then, a static and dynamic performance improvement strategy is proposed. To optimize the static push-force of the actuator, a static multi-objective optimization strategy for actuator structure parameters was developed based on a genetic algorithm. An experimental analysis of dynamic performance was carried out to improve the dynamic response of the actuator. By using a high-precision measuring device in the static-push-force test and dynamic direct current-input-signal tests, the comparisons results between the manufactured conventional actuator and the manufactured optimal actuators showed that the proposed optimization strategy was feasible. Through the static optimization strategy, the average static push-force in the working stroke was improved by 21.8%. Moreover, through the dynamic optimization strategy, the cutoff frequency of the push force response was improved by 129.1%, 79.6% and 74.3%, respectively, at three key positions in the working stroke.

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Woronowicz, Konrad, Majd Abdelqader, Ryszard Palka und Jordan Morelli. „2-D quasi-static Fourier series solution for a linear induction motor“. COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, Nr. 3 (08.05.2018): 1099–109. http://dx.doi.org/10.1108/compel-06-2017-0247.

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Purpose This paper aims to present a method for calculating electromagnetic fields, eddy currents and forces for a quasi-static two-dimensional (2-D) model of linear induction motors (LIMs) where the primary side is modeled as a collection of individual coils. Design/methodology/approach An analytical solution using Fourier series is derived for a general source with current excitations residing in an airgap and moving relative to a conducting plate and back iron. Ideal magnetic material with infinite permeability is used to model the primary iron above the primary source and the back iron below the conducting plate. Findings The analytical solution is compared to a commercial 2-D finite element analysis (FEA) simulation for validation and then compared to a 2-D FEA model with a more detailed geometry of the LIM. The analytical model accurately predicts LIM thrust even though the geometry of the primary core is simplified as an infinitely long flat slab. 2-D frequency FEA can be used successfully to predict in motion LIM performance. Originality/value The analytical solution presented here models the primary excitations as individual discrete coils instead of current sheets, which all existing models are based on. The discrete coils approach provides a more intuitive and realistic model of the LIM.

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Masmoudi, Asma, und Ahmed Masmoudi. „Air gap MMF based prediction of eddy current loss in the PMs of concentrated winding brushless machines“. COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, Nr. 5 (26.08.2014): 1558–68. http://dx.doi.org/10.1108/compel-09-2013-0289.

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Purpose – The purpose of this paper is to an analytical approach-based prediction of the eddy current loss in the PMs of a concentrated winding machine equipped with 12 slots in the stator and ten poles in the rotor. Design/methodology/approach – The investigation of the PM eddy current loss has been carried out using an analytical model and a 2D time-stepped transient finite element analysis (FEA). Findings – It has been found, in the case of the treated machine, that just the subharmonic of rank 1 and the harmonic of rank 7 have significant contributions to the eddy current loss in the PMs. Research limitations/implications – A shift between the results yielded by the developed analytical model and those computed by FEA has been noticed. This limitation is mainly due to the slotting effect which has been omitted in the analytical model. Practical implications – Fractional slot PM machines are currently given an increasing attention in automotive applications. The prediction of their iron loss in an attempt to rethink their design represents a crucial efficiency benefit. Originality/value – The analytical prediction of the eddy current loss in each PM then in all PMs and their validation by FEA represent the major contribution of this work.

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Raza, Ali, Syyed Adnan Raheel Shah, Ahsan Rehman Khan, Muhammad Asif Aslam, Tanveer Ahmed Khan, Kinza Arshad, Sabahat Hussan, Asad Sultan, Gullnaz Shahzadi und Muhammad Waseem. „Sustainable FRP-Confined Symmetric Concrete Structures: An Application Experimental and Numerical Validation Process for Reference Data“. Applied Sciences 10, Nr. 1 (02.01.2020): 333. http://dx.doi.org/10.3390/app10010333.

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The use of fiber-reinforced polymer (FRP) jackets as external confinement is becoming popular, especially in seismic areas, because of its ability to enhance the strength and ductility of reinforced concrete to perform as a sustainable symmetric structural member. Therefore, various researchers have worked out for the prediction of strength and strain models of FRP-confined concrete. This study presents the improved strain models for the FRP confined cylindrical concrete members. Different previously proposed models of axial strain of FRP-confined concrete were evaluated based on a large database of 678 specimens from previous experiments and an improved model was proposed using the general regression analysis technique. Furthermore, the proposed model was validated using the previous experimental work of FRP-wrapped concrete cylinders and their finite elements analysis (FEA) using the ABAQUS software. The accuracy of the proposed strain model was quite satisfactory in comparison with the previous experimental and FEA results of the present study. Moreover, the proposed empirical strain model was used for the parametric study to investigate the effect of different geometric and material parameters such as the compressive strength of unconfined concrete, diameter of the cylinder, elastic modulus and thickness of the FRP layers, on the axial strain of FRP-wrapped cylinders. A close agreement among the proposed strain models and experimental outputs was observed. This study will help in understanding the behavior of sustainable FRP-confined symmetric concrete members.

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Liao, Ching Tsun, Chwei Goong Tseng, Kan Shan Shih und Pei Sheng Lee. „Validation of Bi-Material FEM Alveolar Bone Model“. Advanced Materials Research 739 (August 2013): 388–93. http://dx.doi.org/10.4028/www.scientific.net/amr.739.388.

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The purpose of this study was to verify the stresses induced by dental restoration on bi-material FEM alveolar bone model. Implanting induced stresses over the alveolar bone are studied during the past decades. With the improving computing technology, computer simulations with FEM( Finite Element Method) software are employed on investigating the stresses after the cure. An important issue about FEM calculations is the discretelized model. Single material bone model were adopt in the early stage studies. Due to the nature of human bone structure, the assumption of homogenous material over the bone is not an adequate one nowadays. Bi-material bone structure has become the mainstream of the numerical studies these years. The bones are modeled with a cancellous core surrounded by a dense cortical layer. Forces, stresses, deformations and strains are calculated by performing FEA on those digital bone models. However, the reliability of bi-material bones digital models is not verified. We built a bi-material prototype and an identical digital implanted bone model. Same boundary conditions and loads are applied on both models. The induced strains measured by strain gage agree with the computer calculated results well.

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Kim, Tae Soo, Min Seung Kim und Sung Woo Shin. „Block Shear Behaviors of Angle Two-Bolted Connections with Austenitic Stainless Steel – Experiment and Finite Element Analysis“. Advanced Materials Research 658 (Januar 2013): 350–53. http://dx.doi.org/10.4028/www.scientific.net/amr.658.350.

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Since stainless steel has significant characteristics such as its superior corrosion resistance, durability, aesthetic appeal etc., it has been utilized as structural members in buildings. Recently, ultimate behaviors and curling influence in austenitic stainless steel single shear bolted connections with thin-walled plane plates have been investigated by T.S. Kim. In this paper, finite element analysis (FEA) has been conducted based on the existing test results of angle bolted connections in fabricated with austenitic stainless steel. The validation of the numerical analysis prediction was verified through the comparison of test results for fracture mode, ultimate strength and curling occurrence. Curling (out-of- plane deformation) also observed in the connections with a long end distance. The curling caused the ultimate strength reduction and the ultimate strength reduction ratios (varied from 12% to 25%) caused by curling have been estimated quantitatively through the comparison of FEA results of FE models with free edge and restrained curling.

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Kandis, Janis, und Henry Valberg. „Metal Flow in Two-Hole Extrusion of Al-Alloys Studied by FEA with Experiments“. Key Engineering Materials 504-506 (Februar 2012): 493–98. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.493.

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Forward two-hole extrusion of Al has been investigated with the purpose of studying how metal flow inside the billet is influenced by the location of the holes in the dies, i.e. whether they are position near to or far apart from each other. The study has been conducted by means of finite element analysis (FEA) using the software DEFORM 3D® and validation of simulation results are done by comparison with grid pattern experiments performed long time ago by one of the authors. The analysis shows that the experimental conditions are well reproduced by FEA. New insight into the metal flow phenomena in two-hole extrusion is also gained thanks to the analysis. It is shown, for instance, that moving the holes far apart from each other brings about a distinct shift in the metal flow. The deformations subjected to the peripheral outer shear zones of the billet material then become much more localized than when the two holes are close.

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Watakabe, Tomoyoshi, Chuanrong Jin, Yoshiya Usui, Shinkichi Sakai, Takashi Wakai, Junji Ooshika und Kazuyuki Tsukimori. „ICONE23-1380 VALIDATION OF NONLINEAR FEA MODELS OF A THIN-WALLED ELBOW UNDER EXTREME LOADING CONDITIONS FOR SODIUM-COOLED FAST REACTORS“. Proceedings of the International Conference on Nuclear Engineering (ICONE) 2015.23 (2015): _ICONE23–1—_ICONE23–1. http://dx.doi.org/10.1299/jsmeicone.2015.23._icone23-1_176.

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Abdulqadir, Samer Fakhri, und Faris Tarlochan. „An Experimental Validation of Numerical Model for Top-Hat Tubular Structure Subjected to Axial Crush“. Applied Sciences 11, Nr. 11 (23.05.2021): 4792. http://dx.doi.org/10.3390/app11114792.

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Vehicle crashworthiness is an important aspect to consider when designing a vehicle to ensure the safety of the occupants. Besides this, vehicles are also designed to reduce weight for better fuel economics. One possible approach to reducing weight without compromising vehicle safety is by looking at new designs and usage of composite materials, along with the usage of computational models to reduce time and cost. Hence, this paper displays the experimental results of a carbon fiber reinforced closed top-hat section subjected to both quasi-static and dynamic crushing loading. The results were used to validate the computational model developed in the study. The specimens were made of carbon composite prepregs MTM-44 sheets stacked at the alternative orientation of ±45° and 0°/90°, where 0° direction coincides with the axis of the member. The samples were prepared by using a mold and carbon prepregs under vacuum bagging followed by curing in an autoclave. Trigger initiation was applied to ensure the specimens demonstrated a stable crushing mode of failure during the test. Experimental investigations were carried out under the ambient conditions with different loading conditions, and different kinetic energy ranges (2, 3 and 6 kJ). Experimental data was used to validate the finite element analysis (FEA). The maximum errors obtained between experimental and FEA for mean load, mean energy absorption, and crushing displacement were 13%, 13% and 7%, respectively. The numerically obtained results were in strong agreement with the experimental data and showed that they were able to predict the failure of the specimens. The work also showed the novelty of using such structures for energy absorption applications.

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Tzotzis, Anastasios, Angelos Markopoulos, Nikolaos Karkalos und Panagiotis Kyratsis. „3D finite element analysis of Al7075-T6 drilling with coated solid tooling“. MATEC Web of Conferences 318 (2020): 01038. http://dx.doi.org/10.1051/matecconf/202031801038.

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Due to the fact that simulation of drilling was added in commercial finite element analysis (FEA) software only recently, 3D finite element modelling is an invaluable asset during related researches. The present study employs 3D FEA to model the drilling process of Al7075-T6 alloy with solid carbide tooling, investigates important phenomena that occur during drilling and finally compares the simulated results with experimental data. A number of simulations were performed with DEFORM3D™ software at different cutting conditions; cutting speed of 50m/min, 100m/min, 150m/min and feed of 0.15mm/rev, 0.20mm/rev, 0.25mm/rev. The proposed model takes into consideration certain aspects like damage initiation and evolution of the material, contact interface between the drill bit and the workpiece and standard boundary conditions. Eventually, the acquired numerical data for thrust force were compared to the experimental results for the same cutting conditions and parameters. To obtain the experimental data, a series of nine drilling tests were performed. Upon validation of the numerical data, the temperature distribution on the tool tip – workpiece interface, as well as the chip morphology (shape and curling radius) were determined. Results showed a good agreement between the numerical and the experimental data. Specifically, thrust force and chip morphology exhibited an agreement of about 95% and 90% respectively, which confirms the potential of 3D FEA implementation on machining investigations.

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Sun, Xin Hui, Mu Ming Hao und Zhen Tao Li. „Software Development in Frequency Domain Modal Parameter Identification“. Applied Mechanics and Materials 239-240 (Dezember 2012): 426–29. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.426.

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A modal parameter identification software named as N-Broband is developed in VC++ platform. The software is suitable for EMA and OMA with broband identification feature. Meanwhile it also includes narrow band and selected band modal parameter identification methods. Correlation analysis between experiment and FEA can be performed in N-Broband. The validation of N-Broband is carried out by Test.Lab modal analysis software. The result coincides with Test.Lab very well, which indicates that the developed software can be used in modal analysis of real structure.

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