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Journal articles on the topic 'Computational stress'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Baek, W. K., R. I. Stephens, and B. Dopker. "Integrated Computational Durability Analysis." Journal of Engineering for Industry 115, no. 4 (November 1, 1993): 492–99. http://dx.doi.org/10.1115/1.2901795.

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A computer aided analysis method is described for durability assessment in the early design stages using multibody dynamic analysis, finite element stress analysis, and fatigue life prediction methods. From multibody dynamic analysis of a mechanical system, dynamic loads of a mechanical component were calculated. Finite element stress analysis with substructuring techniques produced accurate stress fields for the component. From the dynamic loads and the stress field of the component, a dynamic stress history at the critical location was produced using the superposition principle. Using Neuber’s rule, a local strain time history was produced from the dynamic stress history. The local strain based fatigue life prediction method was then used to predict “crack initiation” life of the critical component. The predicted fatigue crack initiation life was verified by experimental durability tests. This methodology can be combined with identification of weak links and optimization techniques such that the design optimization for an entire mechanical system based upon durability is possible during the early product development stage.

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2

Sharma, Nandita, and Tom Gedeon. "Modeling observer stress: A computational approach." Intelligent Decision Technologies 9, no. 2 (December 11, 2014): 191–207. http://dx.doi.org/10.3233/idt-140216.

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3

Szirbik, Sándor. "Hypersingular boundary integral equations for plane orthotropic elasticity in terms of first-order stress functions." Journal of Computational and Applied Mechanics 15, no. 2 (2020): 185–207. http://dx.doi.org/10.32973/jcam.2020.011.

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This paper is intended to present an implementation of the hypersingular boundary integral equations in terms of first-order stress functions for stress computations in plane orthotropic elasticity. In general, the traditional computational technique of the boundary element method used for computing the stress distribution on the boundary and close to it is not as accurate as it should be. In contrast, the accuracy of stress computations on the boundary is greatly increased by applying the hypersingular integral equations. Contrary to the method in which the solution is based on an approximation of displacement field, here the first-order stress functions and the rigid body rotation are the fundamental variables. An advantage of this approach is that the stress components can be obtained directly from the stress functions, there is, therefore, no need for Hooke's law, which should be used when they are computed from displacements. In addition, the computational work can be reduced when the stress distribution is computed at an arbitrary point on the boundary. The numerical examples presented prove the efficiency of this technique.

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4

Dillard, John, and Mark E. Nissen. "Computational Modeling of Project Organizations under Stress." Project Management Journal 38, no. 1 (March 2007): 5–20. http://dx.doi.org/10.1177/875697280703800102.

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5

Warraich, Umm-e.-Ammara, Fatma Hussain, and Haroon Ur Rashid Kayani. "Aging - Oxidative stress, antioxidants and computational modeling." Heliyon 6, no. 5 (May 2020): e04107. http://dx.doi.org/10.1016/j.heliyon.2020.e04107.

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6

Patel, Reena, Guillermo Riveros, David Thompson, Edward Perkins, Jan Jeffery Hoover, John Peters, and Antoinette Tordesillas. "A Transdisciplinary Approach for Analyzing Stress Flow Patterns in Biostructures." Mathematical and Computational Applications 24, no. 2 (April 26, 2019): 47. http://dx.doi.org/10.3390/mca24020047.

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This work presents a transdisciplinary, integrated approach that uses computational mechanics experiments with a flow network strategy to gain fundamental insights into the stress flow of high-performance, lightweight, structured composites by investigating the rostrum of paddlefish. Although computational mechanics experiments give an overall distribution of stress in the structural systems, stress flow patterns formed at nascent stages of loading a biostructure are hard to determine. Computational mechanics experiments on a complex model will involve a high degree of freedom thereby making the extraction of finer details computationally expensive. To address this challenge, the evolution of the stress in the rostrum is formulated as a network flow problem generated by extracting the node and connectivity information from the numerical model of the rostrum. The flow network is weighted based on the parameter of interest, which is stress in the current research. The changing kinematics of the system is provided as input to the mathematical algorithm that computes the minimum cut of the flow network. The flow network approach is verified using two simple classical problems. When applied to the model of the rostrum, the flow network approach identifies strain localization in tensile regions, and buckling/crushing in compressive regions.

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7

Gerolymos, G. A., and I. Vallet. "Robust Implicit Multigrid Reynolds-Stress Model Computation of 3D Turbomachinery Flows." Journal of Fluids Engineering 129, no. 9 (March 31, 2007): 1212–27. http://dx.doi.org/10.1115/1.2754320.

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The purpose of this paper is to present a numerical methodology for the computation of complex 3D turbomachinery flows using advanced multiequation turbulence closures, including full seven-equation Reynolds-stress transport models. The flow equations are discretized on structured multiblock grids, using an upwind biased (O[ΔxH3]MUSCL reconstruction) finite-volume scheme. Time integration uses a local dual-time-stepping implicit procedure, with internal subiterations. Computational efficiency is achieved by a specific approximate factorization of the implicit subiterations, designed to minimize the computational cost of the turbulence transport equations. Convergence is still accelerated using a mean-flow-multigrid full-approximation-scheme method, where multigrid is applied only on the mean-flow variables. Speed-ups of a factor 3 are obtained using three levels of multigrid (fine plus two coarser grids). Computational examples are presented using two Reynolds-stress models, and also a baseline k−ε model, for various turbomachinery configurations, and compared to available experimental measurements.

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8

Hasani Najafabadi, S. H., Stefano Zucca, D. S. Paolino, G. Chiandussi, and Massimo Rossetto. "Numerical Computation of Stress Intensity Factors in Ultrasonic Very-High-Cycle Fatigue Tests." Key Engineering Materials 754 (September 2017): 218–21. http://dx.doi.org/10.4028/www.scientific.net/kem.754.218.

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The correct computation of the Stress Intensity Factor (SIF) in ultrasonic Very-High-Cycle Fatigue (VHCF) loading conditions is a key issue when investigating the crack growth rate curve with pre-cracked specimens or when evaluating critical SIF values from fracture surfaces of failed specimens. Dynamic conditions related to the resonance of the vibrating specimen, contact nonlinearity between crack faces and stress singularity at the crack tip make the SIF computation difficult and cumbersome. Generally, numerical computation through Finite Element Models (FEMs) under non-linear dynamic conditions makes use of direct integration methods (implicit or explicit). However, in the high frequency regime of ultrasonic VHCF tests, the procedure may lead to an unacceptable computational time. In order to reduce the computational time, a hybrid procedure based on the Harmonic Balance Method (HBM) and on the Virtual Crack Closure Technique (VCCT) is originally presented and applied in this paper. The dynamic field parameters calculated with the HBM are used as input data for the computation of the SIF through the VCCT.

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9

Ghoniem, Nasr M. "Curved Parametric Segments for the Stress Field of 3-D Dislocation Loops." Journal of Engineering Materials and Technology 121, no. 2 (April 1, 1999): 136–42. http://dx.doi.org/10.1115/1.2812358.

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Under applied mechanical forces, strong mutual interaction or other thermodynamic forces, dislocation shapes become highly curved. We present here a new method for accurate computations of self and mutual interactions between dislocation loops. In this method, dislocation loops of arbitrary shapes are segmented with appropriate parametric equations representing the dislocation line vector. Field equations of infinitesimal linear elasticity are developed on the basis of isotropic elastic Green’s tensor functions. The accuracy and computational speed of the method are illustrated by computing the stress field around a typical (110)-[111] slip loop in a BCC crystal. The method is shown to be highly accurate for close-range dislocation interactions without any loss of computational speed when compared to analytic evaluations of the stress field for short linear segments. Moreover, computations of self-forces and energies of curved segments are guaranteed to be accurate, because of the continuity of line curvature on the loop.

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10

Benthem de Grave, Remco, Fred Hasselman, and Erik Bijleveld. "From work stress to disease: A computational model." PLOS ONE 17, no. 2 (February 16, 2022): e0263966. http://dx.doi.org/10.1371/journal.pone.0263966.

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In modern society, work stress is highly prevalent. Problematically, work stress can cause disease. To help understand the causal relationship between work stress and disease, we present a computational model of this relationship. That is, drawing from allostatic load theory, we captured the link between work stress and disease in a set of mathematical formulas. With simulation studies, we then examined our model’s ability to reproduce key findings from previous empirical research. Specifically, results from Study 1 suggested that our model could accurately reproduce established findings on daily fluctuations in cortisol levels (both on the group level and the individual level). Results from Study 2 suggested that our model could accurately reproduce established findings on the relationship between work stress and cardiovascular disease. Finally, results from Study 3 yielded new predictions about the relationship between workweek configurations (i.e., how working hours are distributed over days) and the subsequent development of disease. Together, our studies suggest a new, computational approach to studying the causal link between work stress and disease. We suggest that this approach is fruitful, as it aids the development of falsifiable theory, and as it opens up new ways of generating predictions about why and when work stress is (un)healthy.

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11

Wang, Junbo, and Leiting Dong. "Computational Grains for Nanocomposites with Interface Stress Effects." International Conference on Computational & Experimental Engineering and Sciences 21, no. 4 (2019): 75. http://dx.doi.org/10.32604/icces.2019.04820.

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12

Heldt, Thomas, Eun B. Shim, Roger D. Kamm, and Roger G. Mark. "Computational modeling of cardiovascular response to orthostatic stress." Journal of Applied Physiology 92, no. 3 (March 1, 2002): 1239–54. http://dx.doi.org/10.1152/japplphysiol.00241.2001.

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The objective of this study is to develop a model of the cardiovascular system capable of simulating the short-term (≤5 min) transient and steady-state hemodynamic responses to head-up tilt and lower body negative pressure. The model consists of a closed-loop lumped-parameter representation of the circulation connected to set-point models of the arterial and cardiopulmonary baroreflexes. Model parameters are largely based on literature values. Model verification was performed by comparing the simulation output under baseline conditions and at different levels of orthostatic stress to sets of population-averaged hemodynamic data reported in the literature. On the basis of experimental evidence, we adjusted some model parameters to simulate experimental data. Orthostatic stress simulations are not statistically different from experimental data (two-sided test of significance with Bonferroni adjustment for multiple comparisons). Transient response characteristics of heart rate to tilt also compare well with reported data. A case study is presented on how the model is intended to be used in the future to investigate the effects of postspaceflight orthostatic intolerance.

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13

Simha, C. Hari Manoj, Rassin Grantab, and Michael J. Worswick. "Computational analysis of stress-based forming limit curves." International Journal of Solids and Structures 44, no. 25-26 (December 2007): 8663–84. http://dx.doi.org/10.1016/j.ijsolstr.2007.07.001.

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14

Xu, Yangjian, and Huang Yuan. "Computational analysis and characterization of fretting stress fields." Computational Materials Science 45, no. 3 (May 2009): 674–79. http://dx.doi.org/10.1016/j.commatsci.2008.06.020.

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15

Shrestha, Santosh, and Mitao Ohga. "An efficient computational method for stress concentration problems." Structural Engineering and Mechanics 22, no. 5 (March 30, 2006): 613–29. http://dx.doi.org/10.12989/sem.2006.22.5.613.

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16

Ristori, T., C. Obbink-Huizer, C. W. J. Oomens, F. P. T. Baaijens, and S. Loerakker. "Efficient computational simulation of actin stress fiber remodeling." Computer Methods in Biomechanics and Biomedical Engineering 19, no. 12 (January 28, 2016): 1347–58. http://dx.doi.org/10.1080/10255842.2016.1140748.

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17

Gizzi, A., C. Cherubini, N. Pomella, P. Persichetti, M. Vasta, and S. Filippi. "Computational modeling and stress analysis of columellar biomechanics." Journal of the Mechanical Behavior of Biomedical Materials 15 (November 2012): 46–58. http://dx.doi.org/10.1016/j.jmbbm.2012.06.006.

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18

Atluri, S. N. "Computational techniques for inelastic stress and fracture analyses." Nuclear Engineering and Design 116, no. 3 (September 1989): 329–42. http://dx.doi.org/10.1016/0029-5493(89)90093-9.

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19

Réthoré, Julien, Adrien Leygue, Michel Coret, Laurent Stainier, and Erwan Verron. "Computational measurements of stress fields from digital images." International Journal for Numerical Methods in Engineering 113, no. 12 (December 4, 2017): 1810–26. http://dx.doi.org/10.1002/nme.5721.

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20

Herrera-Garrido, M. A., V. Mantič, and A. Barroso. "Computational semi-analytic code for stress singularity analysis." Procedia Structural Integrity 42 (2022): 958–66. http://dx.doi.org/10.1016/j.prostr.2022.12.121.

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21

Cowin, Stephen C. "Bone Stress Adaptation Models." Journal of Biomechanical Engineering 115, no. 4B (November 1, 1993): 528–33. http://dx.doi.org/10.1115/1.2895535.

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The basic concepts employed in formulating models of the process of stress adaptation in living bone tissue are reviewed. A purpose of this review is to define and separate issues in the formulation of bone remodeling theories. After discussing the rationale and objective of these models, the concepts and techniques involved in the modeling process are reviewed one by one. It is concluded that some techniques will be more successful than others in achieving the goals of computational bone remodeling. In particular, rationale is given for the preference of surface bone remodeling approaches over internal bone remodeling approaches, and for interactive multi-scale level, rather than mono-scale level, computational strategies.

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22

Chavda, Bhavik, Rupak Shukla, Harshit Tiwari, Ashutosh Pandey, and Yusuf Rehman. "Design of Pressure Vessel Using Computational Techniques." International Journal for Research in Applied Science and Engineering Technology 10, no. 3 (March 31, 2022): 2247–57. http://dx.doi.org/10.22214/ijraset.2022.41116.

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Abstract: This paper discusses some of the recent advances in determining the stress concentration factor in pressure vessels at openings, stress analysis of various types of end connections, and stress minimization by optimizing the location and angle of the nozzle on the shell and head. The area of stress concentration analysis in pressure vessels is gaining popularity, according to the literature. The goal of this study is to look at the stress concentrations that occur at the openings of pressure vessels and how to mitigate their effects. The ASME pressure vessel code governs the design of pressure vessels. The code specifies the thickness and stress of fundamental components; it is up to the designer to determine stress due to other loadings using an appropriate analytical approach. Recent and previous developments, theories for stress concentration estimate, and the possibilities for future investigations are all discussed in this study. We'll also use data analysis software like Solidworks to computationally assess our design. Also, technologies like Excel were considered for creating our design's data sheet, and they were coupled with Solidworks software for a speedy outcome. This strategy will not only save time but will also save money if used on a large basis. The project's main goals and objectives are as follows: Design the pressure vessel following the ASME (American Society of Mechanical Engineers) code. Create a Solidworks 3D model of a pressure vessel. Using Solidworks software, analyze the stiffness and strength of pressure vessel material and design. To improve the facility, staff, and public safety. To use simulation tools to check the design's accuracy. To ensure computation repeatability by using EXCEL as the design calculation method. To make all design methods more efficient in terms of time. To enhance public and personal security. Keywords: Pressure Vessel, Solidworks, Design, Excel, Etc.

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23

SUBHA, K., SHASHIDHARAN, S. SAVITHRI, and V. SYAM PRAKASH. "ASSESSMENT OF COMPUTATIONAL MODELS FOR LAMINATED COMPOSITE PLATES." International Journal of Computational Methods 04, no. 04 (December 2007): 633–44. http://dx.doi.org/10.1142/s0219876207001333.

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In this paper, results of the stress analysis of composite laminates subjected to mechanical load based on different higher order shear deformation theories are presented. Among the many equivalent single layer theories (ESL), the third-order shear deformation theory of Reddy is the most widely accepted model in the study of laminates. This model cannot represent shear stress continuity at the interfaces and zigzag nature of the displacement field. To improve the accuracy of transverse shear stress prediction, layer wise theories have proved to be very promising techniques. In all these theories, zero transverse shear stress boundary conditions at the top and the bottom of the plate are imposed. In many engineering applications, this requirement is not valid when the plate is subjected to shear traction parallel to the surface. To account for this, a displacement model which releases the zero transverse shear stress boundary condition is taken. The unconstrained third-order shear deformation theory (UTSDT) is useful where the boundary layer shear stress is significant. Navier solutions for bending and stress analysis of cross ply laminates are presented using layer wise model, unconstrained third-order shear deformation model and Reddy's ESL model, and compared with 3D elasticity solutions.

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24

Marcián, Petr, Libor Borák, Ondřej Konečný, Petr Navrátil, and Zdeněk Florian. "Computational Modeling of Interaction of Dental Implant with Mandible." Applied Mechanics and Materials 245 (December 2012): 57–62. http://dx.doi.org/10.4028/www.scientific.net/amm.245.57.

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This paper is focused on computational modeling of an interaction of dental implant with mandible bone. It describes creation of computational model including model of geometry, materials, loads and constraints. There is a comparative stress-strain analysis of the levels of cancellous bone model. Computations are performed with the use of finite element method. Results show differences between the model which includes trabecular architecture of cancellous bone tissue and the model with non-trabecular cancellous bone tissue. For better description of the processes in bone tissue and at the interface between bone tissue and implant, it is necessary to create the computational model on the highest possible level, i.e. with the trabecular bone tissue.

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25

S. Shariat, Bashir, Yinong Liu, and Gerard Rio. "Computational Modelling of Deformation of NiTi Plates with Circular Holes." Materials Science Forum 654-656 (June 2010): 2091–94. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2091.

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This study presents a numerical model for deformation behaviour of near-equiatomic NiTi holey plates using finite element method. Near-equiatomic NiTi alloy deforms via stress-induced AM martensitic transformation, which exhibits a typical hystoelastic mechanical behaviour. In this model, the transformation stress is decomposed into two components: the hyperelastic stress, which describes the main reversible aspect of the deformation process, and the hysteretic stress, which describes the irreversible aspect of the process. It is found that with increasing the level of porosity of the holey plate, the nominal stress for the AM transformation decreases and the strain increases. In addition, the stress-strain slope over the stress plateau also increases with increasing the porosity. While the porosity level has a strong effect on global stress-strain behaviour of the holey plate, regularity of the arrangement of the holes is found to have negligible effect.

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26

Kavdia, Mahendra. "Mathematical and Computational Models of Oxidative and Nitrosative Stress." Critical Reviews™ in Biomedical Engineering 39, no. 5 (2011): 461–72. http://dx.doi.org/10.1615/critrevbiomedeng.v39.i5.60.

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27

Polatov, A., Akhmat Ikramov, and D. Razmukhamedov. "COMPUTATIONAL DESIGN OF NONLINEAR STRESS-STRAIN OF ISOTROPIC MATERIALS." Technical science and innovation 2021, no. 1 (May 10, 2021): 18–27. http://dx.doi.org/10.51346/tstu-02.21.1-77-0003.

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The article deals with the problems of numerical modeling of nonlinear physical processes of the stress-strain state of structural elements. An elastoplastic medium of a homogeneous solid material is investigated. The results of computational experiments on the study of the process of physically nonlinear deformation of isotropic elements of three-dimensional structures with a system of one- and double-periodic spherical cavities under uniaxial compression are presented. The influence and mutual influence of stress concentrators in the form of spherical cavities, vertically located two cavities and a horizontally located system of two cavities on the deformation of the structure are investigated. Numerical algorithms have been developed for solving the problems of physically nonlinear deformation of structures made of structural materials, which make it possible to effectively use the capabilities of computer technology. The optimal parameters of computational experiments on the construction and calculation of structures made of fibrous composite materials using a specialized software package have been determined.

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28

Touratzidis, Loudovikos, and Angela Ralli. "A Computational Treatment of Stress in Greek Inflected Forms." Language and Speech 35, no. 4 (October 1992): 435–53. http://dx.doi.org/10.1177/002383099203500404.

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29

Ho¨schl, C., M. Okrouhli´k, J. Cˇerv, and J. Benesˇ. "Analytical, Computational and Experimental Investigations on Stress Wave Propagation." Applied Mechanics Reviews 47, no. 2 (February 1, 1994): 77–99. http://dx.doi.org/10.1115/1.3111072.

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Wave phenomena in intensely loaded bodies are often paradoxical and unexpected. They are evoked by stress wave interactions and depend substantially on actual material properties, body shapes and dimensions, friction, etc. Their proper understanding is indispensable for the reliable evaluation of the quality of various technologies as nuclear reactor safety, armour penetration, nondestructive testing, etc. The paper presents a survey of analytical, computational and experimental techniques and methods being employed for the solutions of stress wave propagation problems in solids.

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30

Di Martino, Elena S., Chiara Bellini, and David S. Schwartzman. "In vivo porcine left atrial wall stress: Computational model." Journal of Biomechanics 44, no. 15 (October 2011): 2589–94. http://dx.doi.org/10.1016/j.jbiomech.2011.08.023.

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31

Lavrov, Alexandre. "Fracture permeability under normal stress: a fully computational approach." Journal of Petroleum Exploration and Production Technology 7, no. 1 (May 23, 2016): 181–94. http://dx.doi.org/10.1007/s13202-016-0254-6.

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32

Perić, Djordje. "On consistent stress rates in solid mechanics: Computational implications." International Journal for Numerical Methods in Engineering 33, no. 4 (February 28, 1992): 799–817. http://dx.doi.org/10.1002/nme.1620330409.

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33

Briñez-De-Leon, Juan-Carlos, Mateo Rico-Garcia, and Alejandro Restrepo-Martínez. "Isochromatic-Art: A Computational Dataset for Digital Photoelasticity Studies." Data 7, no. 11 (November 1, 2022): 151. http://dx.doi.org/10.3390/data7110151.

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The importance of evaluating the stress field of loaded structures lies in the need for identifying the forces which make them fail, redesigning their geometry to increase the mechanical resistance, or characterizing unstressed regions to remove material. In such work line, digital photoelasticity highlights with the possibility of revealing the stress information through isochromatic color fringes, and quantifying it through inverse problem strategies. However, the absence of public data with a high variety of spatial fringe distribution has limited developing new proposals which generalize the stress evaluation in a wider variety of industrial applications. This dataset shares a variated collection of stress maps and their respective representation in color fringe patterns. In this case, the data were generated following a computational strategy that emulates the circular polariscope in dark field, but assuming stress surfaces and patches derived from analytical stress models, 3D reconstructions, saliency maps, and superpositions of Gaussian surfaces. In total, two sets of ‘101430’ raw images were separately generated for stress maps and isochromatic color fringes, respectively. This dataset can be valuable for researchers interested in characterizing the mechanical response in loaded models, engineers in computer science interested in modeling inverse problems, and scientists who work in physical phenomena such as 3D reconstruction in visible light, bubble analysis, oil surfaces, and film thickness.

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Marfia, Sonia, Maria Ricamato, and Elio Sacco. "Stress Analysis of Reinforced Masonry Arches." International Journal for Computational Methods in Engineering Science and Mechanics 9, no. 2 (January 22, 2008): 77–90. http://dx.doi.org/10.1080/15502280701752676.

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35

Farahani, Behzad V., Paulo J. Tavares, Jorge Belinha, and PMGP Moreira. "Compact tension fracture specimen: Experimental and computational implementations on stress intensity factor." Journal of Strain Analysis for Engineering Design 53, no. 8 (March 23, 2018): 630–47. http://dx.doi.org/10.1177/0309324718763189.

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This work concentrates on the characterization of the stress intensity factor range for a compact tension specimen tested under a uniaxial tensile fatigue loading condition. The experimental solution is obtained using a three-dimensional full-field optical technique, digital image correlation. The deformation field is measured and documented for distinct crack lengths. As a relevant fracture parameter, stress intensity factor is thus experimentally measured combined with a computational overdeterministic algorithm for different crack lengths. Moreover, to verify the performance of the proposed fracture model, the cracked compact tension specimen is elasto-statically resolved using advanced discretization techniques, such as the finite element method, the meshless radial point interpolation method and the meshless natural neighbour radial point interpolation method. The finite element method model is thereby analysed with ABAQUS© to enable computation of mode I stress intensity factor results based on strain energy release rate criterion for different crack measurements in addition to strain contours. Likewise, the resolution pattern is repeated for meshless methods, and analogous numerical solutions are thus obtained. Overall, the experimental and numerical stress intensity factor results are compared with an available solution (ASTM E647) exhibiting a reasonable agreement. The novelty of this investigation is the amalgamation of an experimental digital image correlation procedure with a computational overdeterministic algorithm and, most importantly, the meshless formulation performance in the linear elastic fracture mechanics.

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36

Viernstein, Bernhard, and Ernst Kozeschnik. "Integrated Physical-Constitutive Computational Framework for Plastic Deformation Modeling." Metals 10, no. 7 (June 30, 2020): 869. http://dx.doi.org/10.3390/met10070869.

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An integrated framework for deformation modeling has been developed, which combines a physical state parameter-based formulation for microstructure evolution during plastic deformation processes with constitutive creep models of polycrystalline materials. The implementations of power law, Coble, Nabarro–Herring and Harper–Dorn creep and grain boundary sliding are described and their contributions to the entire stress response at a virtual applied strain rate are discussed. The present framework simultaneously allows calculating the plastic deformation under prescribed strain rate or constant stress, as well as stress relaxation after preceding stress or strain loading. The framework is successfully applied for the construction of deformation mechanism maps.

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37

Fallah, Arash S., Ilias N. Giannakeas, Rizgar Mella, Mark R. Wenman, Yasser Safa, and Hamid Bahai. "On the Computational Derivation of Bond-Based Peridynamic Stress Tensor." Journal of Peridynamics and Nonlocal Modeling 2, no. 4 (July 2, 2020): 352–78. http://dx.doi.org/10.1007/s42102-020-00036-9.

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Abstract The concept of ‘contact stress’, as introduced by Cauchy, is a special case of a nonlocal stress tensor. In this work, the nonlocal stress tensor is derived through implementation of the bond-based formulation of peridynamics that uses an idealised model of interaction between points as bonds. The method is sufficiently general and can be implemented to study stress states in problems containing stress concentration, singularity, or discontinuities. Two case studies are presented, to study stress concentration around a circular hole in a square plate and conventionally singular stress fields in the vicinity of a sharp crack tip. The peridynamic stress tensor is compared with finite element approximations and available analytical solutions. It is shown that peridynamics is capable of capturing both shear and direct stresses and the results obtained correlate well with those obtained using analytical solutions and finite element approximations. A built-in MATLAB code is developed and used to construct a 2D peridynamic grid and subsequently approximate the solution of the peridynamic equation of motion. The stress tensor is then obtained using the tensorial product of bond force projections for bonds that geometrically pass through the point. To evaluate the accuracy of the predicted stresses near a crack tip, the J-integral value is computed using both a direct contour approximation and the equivalent domain integral method. In the formulation of the contour approximation, bond forces are used directly while the proposed peridynamic stress tensor is used for the domain method. The J-integral values computed are compared with those obtained by the commercial finite element package Abaqus 2018. The comparison provides an indication on the accurate prediction of the state of stress near the crack tip.

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Priel, Elad, Nissim U. Navi, Brigit Mittelman, Nir Trabelsi, Moshe Levi, Sergey Kalabukhov, and Shmuel Hayun. "Cold Forming of Al-TiB2 Composites Fabricated by SPS: A Computational Experimental Study." Materials 13, no. 16 (August 5, 2020): 3456. http://dx.doi.org/10.3390/ma13163456.

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The mechanical response and failure of Al-TiB2 composites fabricated by Spark Plasma Sintering (SPS) were investigated. The effective flow stress at room temperature for different TiB2 particle volume fractions between 0% and 15% was determined using compression experiments on cylindrical specimens in conjunction with an iterative computational methodology. A different set of experiments on tapered specimens was used to validate the effective flow curves by comparing experimental force–displacement curves and deformation patterns to the ones obtained from the computations. Using a continuum damage mechanics approach, the experiments were also used to construct effective failure curves for each material composition. It was demonstrated that the fracture modes observed in the different experiments could be reproduced in the computations. The results show that increasing the TiB2 particle volume fraction to 10% results in an increase in material effective yield stress and a decrease in hardening. For a particle volume fraction of 15%, the effective yield stress decreases with no significant influence on the hardening slope. The ductility (workability) of the composite decreases with increasing particle volume fraction.

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39

Marcián, Petr, Zdeněk Majer, Zdeněk Florian, and Ivo Dlouhy. "Stress Strain Analysis of High Porous Ceramics." Advanced Materials Research 482-484 (February 2012): 1330–33. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1330.

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The presented paper describes the creation of a computational model of highly porous materials, and a stress-strain analysis is performed. The computational model is created using micro-CT by the finite element method in the ANSYS 12.0 software. The micro-CT slices are converted into a 3D model using image processing. The local equivalent stress (HMH criterion) and struts deformation are analyzed. Commercially available ceramic foam, 85%Al2O3-14%SiO2- 1%MgO, was used in the experiment part of the paper.

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40

Al, Murat, and Edmund B. Webb. "A case study of thin film stress evolution at a dissimilar material interface via molecular dynamics simulations." Nanomaterials and Nanotechnology 8 (January 1, 2018): 184798041877842. http://dx.doi.org/10.1177/1847980418778427.

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Evolution of deformation and stress in growing thin films has been studied in this work using computational simulations that resolve matter at atomic length and time scales. For the surface layers of films laying on the substrate of a dissimilar material, the stress distribution analysis around defects becomes more challenging. Herein, spatial and temporal distribution of deformation and associated stress evolution are presented for different thin film formation events including (1) sub-monolayer growth during an early film nucleation stage and (2) coalescence of adjacent monolayer “islands.” Validity of the stress computed via local computations of the virial expression for stress in a system of interacting particles was checked by comparing to results obtained from considerations of local atomic deformation in conjunction with existing expressions for epitaxial thin film growth stress. For the geometries studied here, where a monolayer of film with a highly characterized linear defect, as in the case of a stacking fault, was simulated for coalescence, fairly good agreement was found. This result demonstrates that, for similar defects at the surface layer, with sufficient sub-ensemble averaging of the standard virial expression for stress, semiquantitative spatial stress distribution information can be obtained from atomic scale simulations. Using our validated stress computation method, we reveal significant stress localization during thin film growth processes, leading to pronounced differences in maximum and minimum stress observed over very small spatial extent (of order multiple GPa over 3–6 nm distances). One prominent mechanism of stress localization revealed here is coalescence between adjacent growing islands. For geometries explored here, stress manifesting during coalescence is highly localized.

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Aznavourian, Ronald, Sébastien Guenneau, Bogdan Ungureanu, and Julien Marot. "Morphing for faster computations with finite difference time domain algorithms." EPJ Applied Metamaterials 9 (2022): 2. http://dx.doi.org/10.1051/epjam/2021011.

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In the framework of wave propagation, finite difference time domain (FDTD) algorithms, yield high computational time. We propose to use morphing algorithms to deduce some approximate wave pictures of their interactions with fluid-solid structures of various shapes and different sizes deduced from FDTD computations of scattering by solids of three given shapes: triangular, circular and elliptic ones. The error in the L2 norm between the FDTD solution and approximate solution deduced via morphing from the source and destination images are typically less than 1% if control points are judiciously chosen. We thus propose to use a morphing algorithm to deduce approximate wave pictures: at intermediate time steps from the FDTD computation of wave pictures at a time step before and after this event, and at the same time step, but for an average frequency signal between FDTD computation of wave pictures with two different signal frequencies. We stress that our approach might greatly accelerate FDTD computations as discretizations in space and time are inherently linked via the Courant–Friedrichs–Lewy stability condition. Our approach requires some human intervention since the accuracy of morphing highly depends upon control points, but compared to the direct computational method our approach is much faster and requires fewer resources. We also compared our approach to some neural style transfer (NST) algorithm, which is an image transformation method based on a neural network. Our approach outperforms NST in terms of the L2 norm, Mean Structural SIMilarity, expected signal to error ratio.

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42

Seoane, Luís F. "Fate of Duplicated Neural Structures." Entropy 22, no. 9 (August 25, 2020): 928. http://dx.doi.org/10.3390/e22090928.

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Statistical physics determines the abundance of different arrangements of matter depending on cost-benefit balances. Its formalism and phenomenology percolate throughout biological processes and set limits to effective computation. Under specific conditions, self-replicating and computationally complex patterns become favored, yielding life, cognition, and Darwinian evolution. Neurons and neural circuits sit at a crossroads between statistical physics, computation, and (through their role in cognition) natural selection. Can we establish a statistical physics of neural circuits? Such theory would tell what kinds of brains to expect under set energetic, evolutionary, and computational conditions. With this big picture in mind, we focus on the fate of duplicated neural circuits. We look at examples from central nervous systems, with stress on computational thresholds that might prompt this redundancy. We also study a naive cost-benefit balance for duplicated circuits implementing complex phenotypes. From this, we derive phase diagrams and (phase-like) transitions between single and duplicated circuits, which constrain evolutionary paths to complex cognition. Back to the big picture, similar phase diagrams and transitions might constrain I/O and internal connectivity patterns of neural circuits at large. The formalism of statistical physics seems to be a natural framework for this worthy line of research.

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Прозоровский, A. Prozorovskiy, Корецкий, S. Koretskiy, Шиверский, E. Shiverskiy, Европин, et al. "Reliability Computation of Heat-power Engine Structures Based on Finite Element Modeling." Safety in Technosphere 3, no. 3 (July 8, 2014): 28–36. http://dx.doi.org/10.12737/4939.

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The computational method was suggested for reliability of heat-power engine structures under continuous random in-process loads. The method is based on numerical statistical modeling of an in-process stress-strain state (SSS) of a structure with random characteristics of structural materials and computation of damage accumulation and durability of the structure under random stationary loadings. The chemical criterion of durable strength has been applied to calculate damage accumulation. The iteration method for a three-dimensional thermo-mechanics problem and the finite-element method have been used to compute the SSS of structures regarding creep. As an example of application of the developed method, computations for durability and reliability of two-layer cooled structure of a thermo-energetic power plant case have been conducted.

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Solórzano-López, Juan, and Francisco Alfredo García-Pastor. "3D Computational Simulation of Multi-Impact Shot Peening." MRS Proceedings 1485 (2012): 35–40. http://dx.doi.org/10.1557/opl.2013.210.

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ABSTRACTShot peening is a widely applied surface treatment in a number of manufacturing processes in several industries including automotive, mechanical and aeronautical. This surface treatment is used with the aim of increasing surface toughness and extending fatigue life. The increased performance during fatigue testing of the peened components is mainly the result of the sub-surface compressive residual stress field resulting from the plastic deformation of the surface layers of the target material, caused by the high-velocity impact of the shot. This compressive residual stress field hinders the propagation and coalescence of cracks during the second stage of fatigue testing, effectively increasing the fatigue life well beyond the expected life of a non-peened component.This paper describes a 3D computational model of spherical projectiles impacting simultaneously upon a flat surface. The multi-impact model was developed in ABAQUS/Explicit using finite element method (FEM) and taking into account controlling parameters such as the velocity of the projectiles, their incidence angle and different impact locations in the target surface. Additionally, a parametric study of the physical properties of the target material was carried out in order to assess the effect of temperature on the residual stress field.The simulation has been able to successfully represent a multi-impact processing scenario, showing the indentation caused by each individual shot, as well as the residual stress field for each impact and the interaction between each one of them. It has been found that there is a beneficial effect on the residual stress field magnitude when shot peening is carried out at a relatively high temperature. The results are discussed in terms of the current shot-peening practice in the local industry and the leading edge developments of new peening technologies. Finally, an improved and affordable processing route to increase the fatigue life of automotive components is suggested.

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Boljanović, Slobodanka, and Andrea Carpinteri. "Computational Failure Analysis under Overloading." Metals 11, no. 10 (September 23, 2021): 1509. http://dx.doi.org/10.3390/met11101509.

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The aim of this research work is to shed more light on performance-based design through a computational framework that assesses the residual strength of damaged plate-type configurations under overloading. Novel expressions are generated to analyze the power of crack-like stress raisers coupled with retardation effects. Analytical outcomes show that careful consideration of the overload location and crack size can be quite effective in improving safety design and failure mode estimation.

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Pedrycz, Witold. "Computational Intelligence: Retrospection and Future." Journal of Advanced Computational Intelligence and Intelligent Informatics 21, no. 1 (January 20, 2017): 9–12. http://dx.doi.org/10.20965/jaciii.2017.p0009.

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This study is aimed at a brief, carefully focused retrospective view at the Computational Intelligence – a paradigm supporting the analysis and synthesis of intelligent systems. We stress the reason behind the emergence of this discipline and identify its main features. We highlight the synergistic aspects of Computational Intelligence arising from an interaction and collaboration of fuzzy sets, neural networks, and evolutionary optimization. Some promising directions of future fundamental and applied research are also identified.

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Kang, Jiwon, Jieun Kim, Taenyun Kim, Hayeon Song, and Jinyoung Han. "Experiencing Stress During COVID-19: A Computational Analysis of Stressors and Emotional Responses to Stress." Cyberpsychology, Behavior, and Social Networking 25, no. 9 (September 1, 2022): 561–70. http://dx.doi.org/10.1089/cyber.2022.0052.

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48

Ahmadzadeh, H., M. K. Rausch, and J. D. Humphrey. "Particle-based computational modelling of arterial disease." Journal of The Royal Society Interface 15, no. 149 (December 2018): 20180616. http://dx.doi.org/10.1098/rsif.2018.0616.

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Accumulated glycosaminoglycans (GAGs) can sequester water and induce swelling within the intra-lamellar spaces of the medial layer of an artery. It is increasingly believed that stress concentrations caused by focal swelling can trigger the damage and delamination that is often seen in thoracic aortic disease. Here, we present computational simulations using an extended smoothed particle hydrodynamics approach to examine potential roles of pooled GAGs in initiating and propagating intra-lamellar delaminations. Using baseline models of the murine descending thoracic aorta, we first calculate stress distributions in a healthy vessel. Next, we examine increases in mechanical stress in regions surrounding GAG pools. The simulations show that smooth muscle activation can partially protect the wall from swelling-associated damage, consistent with experimental observations, but the wall can yet delaminate particularly in cases of smooth muscle dysfunction or absence. Moreover, pools of GAGs located at different but nearby locations can extend and coalesce, thus propagating a delamination. These findings, combined with a sensitivity study on the input parameters of the model, suggest that localized swelling can alter aortic mechanics in ways that eventually can cause catastrophic damage within the wall. There is, therefore, an increased need to consider roles of GAGs in aortic pathology.

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Shiyekar, S. M., and Akshaya Awari. "Static Stress Analysis of Functionally Graded Cylindrical Stiffened Shells." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (December 19, 2022): 1847–52. http://dx.doi.org/10.38208/acp.v1.727.

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In this paper, a study on bending performance of functionally graded (FGM) cylindrical shells under transverse mechanical load is presented. Computational and analytical tools are used to study the behavior of FGM cylindrical shells under bending. Analytical modeling is based on first order shear deformation theory (FOST) and a finite element computational tool ABAQUS is used to model the FGM cylindrical shell. Material properties are estimated by power law index. Results from computational tools for isotropic and FGM cylindrical shells with various boundary and loading conditions are validated with literature and present FOST. Stiffened FG cylindrical shells with cutouts are analyzed. The FGM circular cylindrical shells subjected to an internal pressure with various arrangements of stiffeners are also analyzed and von – Mises stresses are also studied.

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Zhang, Pan, Bei Wang, Zhi Peng Guo, and Ya Nan Shen. "A 3D Computation of Fluid-Structure Interaction in a Cyclone Separator." Applied Mechanics and Materials 540 (April 2014): 106–9. http://dx.doi.org/10.4028/www.scientific.net/amm.540.106.

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This work presents a 3D computation of fluid-structure interaction in a cyclone separator. The finite volume method was used to simulate the flow field in the cyclone separator. The fluid-structure interaction was conducted by transferring the computational pressure distribution to the corresponding surface of the cyclone shell. The stress and deformation distribution in the cyclone shell was computed by the finite element method. Results obtained show that the maximum equivalent stress and deformation is linearly increases with the increases of the inlet gas velocity.

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