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Relevant bibliographies by topics / Quasi-static process

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Academic literature on the topic 'Quasi-static process'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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Journal articles on the topic "Quasi-static process"

1

Kitsunezaki, S., and A. Kurumatani. "The Creation Process of Faults in Quasi-static Deformation." Granular Matter 5, no. 4 (February 1, 2004): 185–92. http://dx.doi.org/10.1007/s10035-003-0150-x.

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Messelmi, Farid, Abdelbaki Merouani, and Hicham Abdelaziz. "Quasi-Static Linear Thermo-Viscoelastic Process with Irregular Viscous Dissipation." Advances in Applied Mathematics and Mechanics 9, no. 4 (January 18, 2017): 924–43. http://dx.doi.org/10.4208/aamm.2014.m656.

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AbstractWe consider a mathematical model which describes the quasi-static evolution of a thermo-viscoelastic linear body with taking into account the effects of internal forces which generate a non linear viscous dissipative function. We derive a variational formulation of the system of equilibrium equation and energy equation. An existence result of weak solutions was obtained in an appropriate function space.

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Pavelko, Vitalijs. "On the Crack Quasi-Static Growth." Key Engineering Materials 827 (December 2019): 312–17. http://dx.doi.org/10.4028/www.scientific.net/kem.827.312.

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The theoretical model of quasi-static crack growth in the elastic-plastic material under load variation in a wide range. Small-scale yielding is principal assumption and main restriction of proposed theory. The model of crack growth provides for continues and interrelated both the crack propagation and plastic deformation development. The nonlinear first-order differential equation describes the quasi-static process of crack growth. In dimensionless form this equation invariant in respect to geometrical configuration and material. The critical size of the plastic zone is proposed as the characteristics of material resistance which is directly connected with the fracture toughness, but more convenient in practical applications of invariant equation. The demonstration of solution is performed for the double cantilever beam that widely used as the standard (DCB) sample for measurement of the mode-I interlaminar fracture toughness. he short analysis of some properties of solution of the invariant equation and its application is done.

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Thomas, Mathew S., Demetra Z. Adrahtas, C. Daniel Frisbie, and Kevin D. Dorfman. "Modeling of Quasi-Static Floating-Gate Transistor Biosensors." ACS Sensors 6, no. 5 (April 22, 2021): 1910–17. http://dx.doi.org/10.1021/acssensors.1c00261.

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Cui, Xiaohui, Zhiwu Zhang, Hailiang Yu, Xiaoting Xiao, and Yongqi Cheng. "Springback Calibration of a U-Shaped Electromagnetic Impulse Forming Process." Metals 9, no. 5 (May 24, 2019): 603. http://dx.doi.org/10.3390/met9050603.

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A three-dimensional (3D) finite-element model (FEM), including quasi-static stamping, sequential coupling for electromagnetic forming (EMF) and springback, was established to analyze the springback calibration by electromagnetic force. Results show that the tangential stress at the sheet bending region is reduced, and even the direction of tangential stress at the bending region is changed after EMF. The springback can be significantly reduced with a higher discharge voltage. The simulation results are in good agreement with the experiment results, and the simulation method has a high accuracy in predicting the springback of quasi-static stamping and electromagnetic forming.

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Ogorelkov, Dmitriy, Vladimir Mironov, and Olga Lukashuk. "Durability of metal structures under quasi-static load." MATEC Web of Conferences 224 (2018): 02091. http://dx.doi.org/10.1051/matecconf/201822402091.

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Failure of materials and structures is one of unresolved problems of mechanics. This paper offers an approximate approach to assessing durability of products on the basis of a mechanical experiment. The experiment represents the fatigue process as a transition of a plastic material into its brittle state. A simplified physical model – which could be used to build a mathematical model of fatigue process – hangs on a local transition of a plastic material into its brittle state. The calculation methodology includes both an original part on cyclic degradation of material strength and correlations based on experiments and checked by design routines. Two approaches to calculating the durability of a randomly-loaded object are compared: using the equation of cyclic degradation of strength and the rule of linear summation of fatigue damages. The results obtained are useful for improving methodologies of calculating service life or durability of structures.

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Zhu, Hongwei, Yaodong Feng, Danfeng Lu, Yahya Sandali, Bin Li, Gang Sun, Ning Zheng, and Qingfan Shi. "Dynamics of quasi-static collapse process of a binary granular column." Powder Technology 339 (November 2018): 970–73. http://dx.doi.org/10.1016/j.powtec.2018.08.051.

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Rozgić, Marco, Yalin Kiliclar, Marcus Stiemer, and Stefanie Reese. "Virtual process design on combined quasi-static and high-speed forming." PAMM 15, no. 1 (October 2015): 577–78. http://dx.doi.org/10.1002/pamm.201510278.

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MANABE, Kazuyoshi, and Ken NAKANO. "The Breakdown Process of Hexadecane Films Induced by Quasi-Static Loading." Journal of Advanced Mechanical Design, Systems, and Manufacturing 1, no. 5 (2007): 640–48. http://dx.doi.org/10.1299/jamdsm.1.640.

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Pan, Bei-Cheng, Qing-Fan Shi, and Gang Sun. "Experimental Observation of Quasi-Static Avalanche Process of a Granular Pile." Chinese Physics Letters 30, no. 12 (December 2013): 124701. http://dx.doi.org/10.1088/0256-307x/30/12/124701.

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Dissertations / Theses on the topic "Quasi-static process"

1

Vohnout, Vincent J. "A hybrid quasi-static/dynamic process for forming large sheet metal parts from aluminum alloys /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487952208106469.

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Pihnastyi, O. M., G. K. Kozhevnikov, and Tetiana Bondarenko. "The information controlling model transport system during transient conditions." Thesis, Institute of Electrical and Electronics Engineers, Inc., USA, 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48796.

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This article is devoted to designing an information management system for the conveyor line of mining enterprises. The analytical design method for the transient mode of the stepped speed control system of the conveyor line was developed. The partial differential equation was used in constructing the conveyor line model. The description of the production system is fulfilled in the single step approximation. A decision was obtained which determines the state of the parameters of the production line for a technological position specified as a function of time. Has been determined the length of the transition period during which the initial condition for the distribution of labour objects along the conveyor affects the parameters of the state of the conveyor line. The method for calculating the current parameters of a conveyor line with the use of partial differential equations allows the design of control systems for production lines of conveyor type for transient modes. The originality of the results obtained is to improve the PDE-models of the conveyor-type production systems used to design highly efficient production control systems operating in transient modes.

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Пигнастый, Олег Михайлович, and Виктор Яковлевич Заруба. "Задачи программного управления параметрами поточной линии с использованием сверхурочных работ." Thesis, ЦНИИ "Электроприбор", 2012. http://repository.kpi.kharkov.ua/handle/KhPI-Press/42004.

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Рассмотрены основные элементы технологического процесса. Показана их взаимосвязь между собой в ходе движения предмета труда по технологическому маршруту. Детально рассмотрено техническое содержание задачи управления параметрами технологического процесса через сверхурочные работы. Представлена модель управления параметрами технологического процесса, основанная на статистических балансовых уравнениях для макропараметров технологического процесса. Поставлена задача программного управления параметрами технологического процесса.

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Hussien, Abdou Mekky Mousa. "Ionization of diatomic molecules in intense laser fields." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17323.

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In dieser Arbeit wurde die Ionisation einiger zweiatomiger Moleküle (H2, N2 und O2) in intensiven Laserfeldern untersucht. Hierbei wurden verschiedene Modelle zur Beschreibung der Tunnelionisation sowohl untereinander als auch mit der Lösung der zeitabhängigen Schrödingergleichung (TDSE) verglichen. Die kernabstandsabhängige Ionisationswahrscheinlichkeit wurde für verschiedene Intensitäten betrachtet und die Gültigkeit modifizierter atomarer bzw. Molekularer Modelle zur Beschreibung der Tunnelionisation analysiert. Es wurde herausgefunden, dass Modelle, die auf der quasistatischen Näherung beruhen (wo die Ionisation unabhängig von der Frequenz des Laserfeldes ist), nur in einem kleinem Frequenz- und Intensitätsbereich hinreichend genaue Ergebnisse liefern, dem Tunnelregime. Modelle mit einem frequenzabhängigen Faktor stimmen hingegen sowohl im Tunnel- als auch im Mehrphotonenregime mit den genaueren TDSE Ergebnissen überein. Weiterhin wird auch die Abweichung zur Franck-Condon Näherung verdeutlicht. Es wurde ein kleiner Einfluss auf die Revival-Zeit des im Wasserstoffmolekül-Ion gestarteten Wellenpakets gefunden. Die Berücksichtigung von Bond-Softening führt weiterhin zu einer Verringerung der Revival-Zeit mit steigender Spitzenintensität des Lasers. Außerdem wird die Anisotropie der Ionisation von H2 als Funktion der Laserintensität in linear und zirkular polarisiertem Licht mit dem molekularen Tunnelmodell MO-ADK untersucht. Gute Übereinstimmung mit den experimentellen Beobachtungen wurde gefunden, insbesondere wenn der Effekt des Fokusvolumens des Laserfeldes berücksichtigt wird. Die Anwendbarkeit des Zwei-Zentren-Modells auf größere Moleküle, N2 und O2, wird ebenfalls getestet. Es wird beobachtet, dass dies für N2 (symmetrisches HOMO) funktioniert, für O2 (asymmetrisches HOMO) jedoch nicht.
The ionization of some diatomic molecules, H2, N2, and O2, exposed to intense laser fields has been studied by comparing various molecular tunneling–ionization models with each other and with the numerical solution of the time-dependent Schrödinger equation (TDSE). The internuclear-distance dependent ionization yields over a wide range of laser peak intensities are investigated and the validity of the modified atomic and molecular tunneling models is examined. It is found that those models that depend on the quasi-static approximation, where ionization is independent on the oscillation frequency of the applied laser field, are useful for laser-induced ionization processes in only a very small region of the frequency and intensity domain of laser fields, i.e. in the tunneling regime. The models that include a frequency dependent factor are in a good agreement with the accurate TDSE calculations in both the multiphoton and the tunneling ionization regimes. Furthermore, the deviation from Franck-Condon-like distribution is also clarified. A small effect on the revival time of the vibrational wavepacket of hydrogen molecular ion, due to this deviation, has been found. Consideration of the bond-softening effect leads to a decrease in the revival time with increasing laser-peak intensity. The anisotropy of H2 as a function of laser intensity in linear and circular polarized fields using molecular tunneling model (MO-ADK) are also studied and a good agreement with the experimental observations, especially if the focal volume of the laser field is considered, has been obtained. The applicability of the two-center model for larger molecules, N2 and O2, is tested. It is found that it works with N2 (symmetric HOMO) but fails in O2 (ansymmetric HOMO).

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Fu, Chi-Chun, and 傅啟淳. "Reversible folding of hen egg white lysozyme by a quasi-static process." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/70010749769756139645.

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碩士
朝陽科技大學
應用化學系碩士班
94
In terms of the first-order-like state transition model, we study the folding process of the egg white lysozyme by the nuclear magnetic resonance technique, and try to find out its folding core. By adjusting the concentrations of urea, DTT and other chemical reagents, the egg white lysozyme, beginning from the denaturated state, goes through an overcritical reaction path to the native conformation step by step. The characteristic of different stages in the folding process is monitored by measuring the chemistry shift indexes, the NOE signals of the backbone amino protons and α-protons, and the hydrogen-deuterium exchange rate. The result reveals that the structure of the unfolded state of lysozyme is very weak. Bringing down the concentration of DTT will induce the formation of helix conformation, further lowering the concentration of urea will stabilize the helix conformation. While urea is completely removed from the solution, β -sheet structure appears in the segment of lysozyme with sequence number from 39 to 60. However, the effect of the pH value and concentration of mannitol on the protein conformation is not obvious. According to the NMR spectroscopy, the segments C6~G22 and N2 ~F34 of the egg white lysozyme present stable helix conformation in each middle status from the unfolded state to the native conformation. Together with the result of the dynamic light scattering experiment, it is inferred that these two segments, C6~G22 and N27~F34, should be the initiating location of the folding of the egg white lysozyme.

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cheng, Yeh-Xu, and 葉旭成. "Reversible folding of lysozyme by a quasi-static process: A first-order-like state transition." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/53677346481453857105.

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碩士
國立東華大學
應用物理研究所
92
A first-order-like state transition model is considered to be a global reaction mechanism to directly fold protein from unfolded state to its native form. In order to more well studied verify the general applicability of this mechanism, a model protein, lysozyme, was fully unfolded by 4.5 M urea, 0.1 M dithiothreitol (DTT) in pH 3 and then refolded to its native form by way of an overcritical reaction path (a quasi-static process) or by crossing over a transition boundary directly (a direct dilution process). Within this study, lysozyme was trapped in a glassy state through a direct folding path, and can be folded into its native state by further increase of the concentration of lysozyme by micro-cone. This indicated that a state transition line or boundary may exist during the direct folding path. However, lysozyme can be continuously folded from unfolded to native state by an overcritical reaction path. Four stable folding intermediates and the native lysozyme were obtained and then secondary structures, particle size distribution, thermal stability and oxidation state of disulfide bonds were analyzed by circular dichroism (CD) spectroscopy, dynamic light scattering (DLS), differential scanning calorimetry (DSC) and Raman spectroscopy, respectively. According to the results, intermediates of both reaction paths follow the theme of collapse, sequential and first-order-like state transition model. This indicated that protein folding under different reaction paths might follow the same folding mechanism. Namely, the mechanism that is revealed by overcritical folding intermediates may represent the true mechanism of protein folding. A protein folding reaction mechanism was postulated and discussed. In spite of the global interaction mechanism, the fact that an α-helix is formed prior to the β-sheet may indicate that the protein folding is initiated by local interactions.

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Books on the topic "Quasi-static process"

1

Goldberg, B. Quasi-static probabilistic structural analyses process and criteria. [Huntsville, Ala.]: National Aeronautics and Space Administration, Marshall Space Flight Center, 1999.

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Goldberg, B. Quasi-static probabilistic structural analyses process and criteria. [Huntsville, Ala.]: National Aeronautics and Space Administration, Marshall Space Flight Center, 1999.

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Goldberg, B. Quasi-static probabilistic structural analyses process and criteria. [Huntsville, Ala.]: National Aeronautics and Space Administration, Marshall Space Flight Center, 1999.

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Goldberg, B. Quasi-static probabilistic structural analyses process and criteria. [Huntsville, Ala.]: National Aeronautics and Space Administration, Marshall Space Flight Center, 1999.

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V, Verderaime, George C. Marshall Space Flight Center., and United States. National Aeronautics and Space Administration., eds. Quasi-static probabilistic structural analyses process and criteria. [Huntsville, Ala.]: National Aeronautics and Space Administration, Marshall Space Flight Center, 1999.

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Book chapters on the topic "Quasi-static process"

1

Sadowski, T. "Modelling of Semi-Brittle Ceramics Behaviour under a Quasi-Static Deformation Process." In Solid Mechanics and Its Applications, 281–86. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8494-4_38.

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Huon, Vincent, Bruno Cousin, and Olivier Maisonneuve. "Study of Thermal and Kinematic Phenomena Associated with Quasi-static Deformation and Damage Process of some Concretes." In Novel Approaches in Civil Engineering, 187–201. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-45287-4_14.

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Diestmann, Thomas, Nils Broedling, Benedict Götz, and Tobias Melz. "Surrogate Model-Based Uncertainty Quantification for a Helical Gear Pair." In Lecture Notes in Mechanical Engineering, 191–207. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77256-7_16.

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AbstractCompetitive industrial transmission systems must perform most efficiently with reference to complex requirements and conflicting key performance indicators. This design challenge translates into a high-dimensional multi-objective optimization problem that requires complex algorithms and evaluation of computationally expensive simulations to predict physical system behavior and design robustness. Crucial for the design decision-making process is the characterization, ranking, and quantification of relevant sources of uncertainties. However, due to the strict time limits of product development loops, the overall computational burden of uncertainty quantification (UQ) may even drive state-of-the-art parallel computing resources to their limits. Efficient machine learning (ML) tools and techniques emphasizing high-fidelity simulation data-driven training will play a fundamental role in enabling UQ in the early-stage development phase.This investigation surveys UQ methods with a focus on noise, vibration, and harshness (NVH) characteristics of transmission systems. Quasi-static 3D contact dynamic simulations are performed to evaluate the static transmission error (TE) of meshing gear pairs under different loading and boundary conditions. TE indicates NVH excitation and is typically used as an objective function in the early-stage design process. The limited system size allows large-scale design of experiments (DoE) and enables numerical studies of various UQ sampling and modeling techniques where the design parameters are treated as random variables associated with tolerances from manufacturing and assembly processes. The model accuracy of generalized polynomial chaos expansion (gPC) and Gaussian process regression (GPR) is evaluated and compared. The results of the methods are discussed to conclude efficient and scalable solution procedures for robust design optimization.

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Abrosimov, Nikolaii A., Aleksandr V. Elesin, and Leonid Igumnov. "Computer Simulation of the Process of Loss of Stability of Composite Cylindrical Shells Under Combined Quasi-static and Dynamic Loads." In Advanced Structured Materials, 125–37. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53755-5_9.

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Matyukhin, Yu G., and V. M. Tomozov. "The Quasi-Static Evolution of Magnetic Structures on the Sun and their Topological Reconstruction." In Basic Plasma Processes on the Sun, 345–46. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0667-9_62.

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Fukuyama, Eiichi, Chihiro Hashimoto, and Mitsuhiro Matsu’ura. "Simulation of the Transition of Earthquake Rupture from Quasi-static Growth to Dynamic Propagation." In Earthquake Processes: Physical Modelling, Numerical Simulation and Data Analysis Part I, 2057–66. Basel: Birkhäuser Basel, 2002. http://dx.doi.org/10.1007/978-3-0348-8203-3_10.

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Skripnyak, Vladimir A., Evgeniya G. Skripnyak, and Vladimir V. Skripnyak. "Failure Mechanisms of Alloys with a Bimodal Graine Size Distribution." In Springer Tracts in Mechanical Engineering, 521–34. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_23.

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AbstractA multi-scale computational approach was used for the investigation of a high strain rate deformation and fracture of magnesium and titanium alloys with a bimodal distribution of grain sizes under dynamic loading. The processes of inelastic deformation and damage of titanium alloys were investigated at the mesoscale level by the numerical simulation method. It was shown that localization of plastic deformation under tension at high strain rates depends on grain size distribution. The critical fracture stress of alloys depends on relative volumes of coarse grains in representative volume. Microcracks nucleation at quasi-static and dynamic loading is associated with strain localization in ultra-fine grained partial volumes. Microcracks arise in the vicinity of coarse and ultrafine grains boundaries. It is revealed that the occurrence of a bimodal grain size distributions causes increased ductility, but decreased tensile strength of UFG alloys. The increase in fine precipitation concentration results not only strengthening but also an increase in ductility of UFG alloys with bimodal grain size distribution.

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Delcuse, Laura, Slim Bahi, Urvashi Gunputh, Paul Wood, and Alexis Rusinek. "Constitutive Modelling of Laser Based Powder Bed Fusion Melted Inconel 718 Superalloy over a Wide Range of Strain Rates." In Advances in Transdisciplinary Engineering. IOS Press, 2021. http://dx.doi.org/10.3233/atde210036.

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The aim of this paper is to determine the material parameters of the Inconel 718 manufactured by Laser Powder Bed Fusion, using the Johnson-Cook model. Different compression tests in quasi-static and dynamic domains were performed under various strain rates, in range of 10-3 s-1 to 2500 s-1 at the room temperature. The difference between the two building directions XY and ZX, horizontal and vertical position from the substrate, was investigated to highlight the influence of the process parameter on the bulk material behavior. Finally, the identified parameters were implemented into a numerical model, describing the behavior of auxetic structure under compression test, and validated using experimental data.

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Barik, Saibal Kanchan, Niranjan Sahoo, and Nikki Rajaura. "Deformation Assessment of Stainless Steel Sheet Using a Shock Tube." In Applications and Techniques for Experimental Stress Analysis, 134–52. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1690-4.ch009.

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In the present study, a high-velocity sheet metal forming experiment has been performed using a hemispherical end nylon striker inside the shock tube. The striker moves at a high velocity and impacts the sheet mounted at the end of the shock tube. Three different velocity conditions are attained during the experiment, and it helps to investigate the forming behavior of the material at different ranges of velocity conditions. Various forming parameters such as dome height, effective strain distribution, limiting strain, hardness, and grain structure distribution are analysed. The dome height of the material increases monotonically with the high velocity. The effective-strain also follows the similar variation and a bi-axial stretching phenomenon is observed. The comparative analysis with the quasi-static punch stretching process illustrates that the strain limit is increased by 40%-50% after the high-velocity forming. It is because of the inertial effect generated on the material during the high-velocity experiment, which stretches the sheet further without strain localization.

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Bibik, Olena, and Oleksandr Popovich. "INCREASING THE EFFICIENCY OF ELECTRIC DRIVES WITH PERIODICAL LOADING BY USING COMPREHENSIVE MATHEMATICAL MODELING MEANS." In Priority areas for development of scientific research: domestic and foreign experience. Publishing House “Baltija Publishing”, 2021. http://dx.doi.org/10.30525/978-9934-26-049-0-31.

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The mode of operation of induction motors (IMs) affects their performance. In most cases, motors are optimally designed for steady state operation. When operating in other modes, additional attention is required to the problems of energy efficiency. Induction motors are the most common type of electromechanical energy converters, and a significant part of them operate under conditions of periodic changes in the load torque. The work is devoted to solving the problem of increasing the energy efficiency of asynchronous motors of electromechanical systems with a periodic load, including pumping and compressor equipment. The traditional solution to this problem for compressor equipment is the optimal design of an IM under static conditions, as well as the use of flywheels, the use of an IM with an increased slip value and controlled IM with a squirrel-cage rotor and with frequency converters. In this work, the modes of operation of asynchronous motors with periodic loading are investigated. For this, complex mathematical models are developed in the simulation system. Such models are effective in modeling taking into account periodic load changes: repetitive transient processes, their possible asymmetry and non-sinusoidality, increased influence of nonlinearity of electromagnetic parameters. In complex mathematical modeling, the mutual influence of the constituent parts of the electromechanical system is taken into account. Simulation allowed quantifying the deterioration in energy efficiency under intermittent loading, in comparison with static modes. Criteria for evaluating quasi-static modes have been developed and areas of critical decrease in efficiency have been determined. The paper proposes and demonstrates a methodology for solving this problem. For this purpose, tools have been created for the optimal design of asynchronous motors as part of electromechanical systems with periodic loading. These tools include: complex mathematical models of electromechanical systems with asynchronous motors with periodic load, mathematical tools for determining the parameters of quasi-steady-state modes, the methodology of optimal design based on the criterion of the maximum efficiency of processes under quasi-steady-state modes of operation. The possibilities, advantages and prospects of using the developed mathemati-cal apparatus for solving a number of problems to improve the efficiency of electric drives of compressor and pumping equipment are demonstrated. It is shown that by taking into account quasi-static processes, the use of complex mathematical models for the optimal design of asynchronous motors with a periodic load provides an in-crease in efficiency up to 8 ... 10%, relative to the indicators of motors that are de-signed without taking into account the quasi-static modes. The areas of intense quasi-steady-state modes are determined using the devel-oped criterion. In these areas, there is a critical decrease in efficiency compared to continuous load operation. A decrease in efficiency is associated with a decrease in the amount of kinetic energy of the rotating parts compared to the amount of electromagnetic energy. In connection with the development of a frequency-controlled asynchronous drive of mechanisms with a periodic load, the relevance of design taking into account the peculiarities of quasi-static has increased significantly. For example, a variable frequency drive of a refrigerator compressor or a heat pump can increase energy efficiency up to 40%, but at low speeds, due to a decrease in kinetic energy, the efficiency can decrease to 10 ... 15%, unless a special design methodology is applied. This problem can be solved by using the complex mathematical modeling tools developed in the article.

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Conference papers on the topic "Quasi-static process"

1

YEOM, CHAN, and ANTHONY VIZZINI. "Quasi-static analysis of peeling process using geometrically nonlinear finite element model." In 32nd Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1991. http://dx.doi.org/10.2514/6.1991-1004.

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"Quasi-static Process Modelling of Deep Cold Rolling on Ti-6Al-4V." In Residual Stresses 10. Materials Research Forum LLC, 2016. http://dx.doi.org/10.21741/9781945291173-2.

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Pająk, Małgorzata, and Jacek Janiszewski. "Steel fibre reinforced self-compacting concrete subjected to quasi-static and dynamic loading conditions." In 3RD NATIONAL CONFERENCE ON CURRENT AND EMERGING PROCESS TECHNOLOGIES – CONCEPT 2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0007804.

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Aniszewska, Dorota, and Marek Rybaczuk. "Exploring process of fibre breaking in tube samples of composite during quasi-static process of fracture." In Selected Papers from the 3rd Chaotic Modeling and Simulation International Conference (CHAOS2010). WORLD SCIENTIFIC, 2011. http://dx.doi.org/10.1142/9789814350341_0011.

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Ding, Lingyun, and Ping Huang. "Friction Force Calculation in a Quasi-Static Sliding Process Based on the Energy Principle." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44452.

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A method based on the energy principle is introduced to calculate the friction force in a quasi-static sliding process with two flat elastic surfaces of the same metal. The energy dissipation mechanism during the process is analyzed with IO model. The results show that the friction force is proportional to the standard interfacial potential energy barrier and the real contact area. The numerically calculated friction force is also compared with the experimental data.

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Farley, D., Y. Zhou, A. Dasgupta, J. F. J. Caers, and J. W. C. de Vries. "Qualification of SiP Products: Quasi-Static Cyclic Mechanical Bending." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43898.

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An LGA (Land Grid Array) laminate-based epoxy-molded RF SiP (system-in-package) containing four wirebonded and three flip-chip dice is qualified for quasi-static mechanical flexure using a PoF (Physics-of-Failure) approach. The process includes: design and execution of accelerated stress testing; failure analysis to identify the failure mode and mechanism; and mechanistic simulations to assess acceleration factors for extrapolation of the failures to field environments for selected failure mechanisms. Illustrative qualification results are presented for solder joint fatigue.

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VanBenthysen, Reid, Jonathan Michaud, Peter DiSalvo, Brad L. Kinsey, Michael Blakely, and Jianhui Shang. "Microscale Flanging Using Quasi-Static and Electromagnetic Forming Processes." In ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing. ASMEDC, 2008. http://dx.doi.org/10.1115/msec_icmp2008-72135.

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Past research has shown that scatter in material properties and springback (i.e., the elastic recovery of material after the tooling is extracted) increase as components are miniaturized to the microscale. At the macroscale, electromagnetic forming (EMF) has been shown to completely eliminate or at least decrease springback by varying the deformation mechanism. In EMF, a capacitor bank is charged and then quickly dissipated into a specially designed magnetic coil. A transient magnetic field is produced which induces eddy currents in the workpiece, and any other conductive material nearby. The magnetic fields in the coil and the workpiece are repulsive; thus, the workpiece is launched at a high velocity away from the coil. EMF at the macroscale requires a significant amount of stored energy. However at the microscale, EMF may be a viable process due to the reduced energy and force requirements and thus is being investigated in this work.

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Krovvidi, Sai C., M. Ramulu, and Per G. Reinhall. "Numerical Study of the Percussive Riveting Process: Simulation Results." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24096.

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Abstract Percussive riveting is a widely used assembly method in the aerospace industry. The joints produced using this technique have consistently high fatigue strength. It is a manual assembly technique but automation has been introduced in certain instances on the work floor to assist assembly workers. In this paper, study was set up to analyze the effect of important geometric parameters on the residual stress and strain distributions within the riveting stackup. In the current paper, a realistic set of boundary conditions have been adopted with both movable riveting die and movable bucking bar in an axisymmetric thermomechanical model that has a countersunk rivet. The knowledge of this evolution is important to gain understanding of the differences between quasi-static squeeze riveting process and the percussive riveting process. The distribution of residual strains and stresses play an important role in influencing the fatigue strength of the assembled joined. Most if not all of the percussive research till date is focused on the process automation advances but enough work has not been done to understand the properties of the assembled joint using the percussive technique. The percussive results will be compared with quasi-static squeeze process results. Strain rate effects and thermal effects are negligible in the quasi-static process while these effects are present in the percussive process. So, the results and observations from quasi-static DOE will be used as a benchmark against which the percussive DOE results will be compared. The Johnson-Cook material model has been used for describing the flow stress of the alloys used in the percussive process.

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Harder, Lars, Thomas Lundholm, and Bo Lindström. "An Adaptive Control Subsystem for Quasi-Static Cutting Force Control in Turning." In ASME 1991 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/cie1991-0163.

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Abstract The future capital intensive manufacturing industry will demand efficient utilization of machine tools. Thus, a modular real-time adaptive control (AC) system for turning is being developed. Different real-time monitoring and control tasks are assigned to integral subsystems respectively, organized in a distributed computer system and supervised by a master computer in accordance with a main AC strategy. The subsystem for quasi-static cutting force control adapts the feedrate to the present machining situation in order to keep the tangential cutting force constant at a maximum level, given by the machine tool and the tool constraints. Since the cutting process is nonlinear and time-varying, it is difficult to control Therefore, a linearized process model has been introduced and a constant-gain, incremental Pi-controller has been designed and tested with good results. In this paper we will present the AC turning system, focusing on the subsystem for quasi-static cutting force control.

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Nili Ahmadabadi, Zahra, Frédéric Laville, and Raynald Guilbault. "An Empirical Prediction Law for Quasi-Static Nail-Particle Board Penetration Resistance." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70218.

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The present study belongs to a broader investigation aiming to reduce noise emissions in nail guns. This noise reduction objective may be achieved by nail gun concept design improvements. However, modifying the tool design requires precise understanding of it dynamics. Therefore a dynamic model of the system including accurate predictions of the tribo-dynamic interactions at the wood-nail interface generating the penetration resistance forces (PRF) appears to be essential. Since different wood products possess different structural/material properties, PRF is first evaluated for various types of wood product individually. Ref. [1] develops the PRF modeling strategy and examines the nail penetration process for plywood samples. The present paper proposes an empirical model predicting PRF imposed on nails when penetrating particle board (PB) at quasi-static velocities (20–500 mm/min range). A universal testing machine (MTS) is used to drive the nails into the wood samples. Each wood sample is composed of five panels PB screwed together. The sample size is chosen to reduce the boundary influence on the penetration process and to avoid the complete perforation of the sample. To eliminate the possible acceleration influence, the penetration speed is maintained at constant amplitudes. The MTS machine measured PRF as a function of the position. The objective is to prepare a formulation predicting PRF as a function of nail position. In order to extend the prediction formula application range, the analysis reduces the studied factors to dimensionless parameters. The analysis shows that the PB fabrication process results in panels presenting three regions of different hardness modulus. As a result, at the region transitions the PRF curves show large amplitude fluctuations. This layered heterogeneity makes the development of a high precision prediction model representing various nail sizes very difficult. Nevertheless, the final model produces PRF evaluations with overall precision greater than 88% for most of the nail penetration.

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Reports on the topic "Quasi-static process"

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EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF PEC COMPOSITE COLUMN-STEEL BEAM FRAME WITH WELDED T-STUB STRENGTHENED CONNECTIONS. The Hong Kong Institute of Steel Construction, September 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.5.

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Seismic performance of innovative Partially Encased Composite (PEC) column-steel beam composite frame was investigated, where the connection was strengthened by the welded T-stub. A ½ scale, two-storey, and one bay composite frame specimen was designed and fabricated for the quasi-static test. Through the experimental observation and measurements, the seismic performance were evaluated, including hysteretic characteristic, lateral stiffness, seismic energy dissipation, and ductility. The plastic damage evolution process and ductile failure mode were clarified. The results indicated that the welded T-stud strengthened connection enhanced the integrity of the frame and led to higher seismic strength and larger lateral stiffness. The plastic hinge was observed away from the beam end due to the welded T-stud and the specimen exhibited an approximately completed hysteretic loop. Without significant decreasing of the ultimate bearing capacity, its overall drift, ductility efficient and equivalent viscous damping ratio were 3.63% (push) / 4.07% (pull), 3.21 (push) / 3.70 (pull) and 0.261 respectively. The proposed structure possesses sound deformation, ductility, and energy-dissipation capacity with the desired plastic failure mode induced by the plastic hinges formed in all beam sections near the T-stud end and column section at the bottom, successively. It was demonstrated an ideal ductile energy-dissipation mode of the frame structure.

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