Study on Stress-Strain Model of Metallic Materials with Shot Peening Residual Stress

2012 ◽  
Vol 591-593 ◽  
pp. 1121-1126 ◽  
Author(s):  
Tie Shan Zhang ◽  
Jing Hu ◽  
Jin Shui Wu
Keyword(s):  
Residual Stress ◽  
Strain Analysis ◽  
Material Model ◽  
Metallic Materials ◽  
Model Combination ◽  
Stress Strain ◽  
Modeling Tools ◽  
The Relationship ◽  
Strain Model ◽  
Test Result

Study on Stress-strain model of metallic materials with residual stress. First of all, Stress-strain model of metallic materials with residual stress was analyzed, then, derivation of a stress-strain model was done. Finally, according to the model of stress and strain analysis and derivation of results, taking diaphragm spring as an example, using methods of derivation of kinds of material obtained from this model portfolio, using finite element modeling tools, calculate the relationship between load and deformation. The test result indicated that, using the method of many kinds of material model combination can get the higher precision of calculation.

Delamination in the scoring and folding of paperboard

TAPPI Journal ◽  
2012 ◽  
Vol 11 (1) ◽  
pp. 61-66 ◽  
Author(s):  
DOEUNG D. CHOI ◽  
SERGIY A. LAVRYKOV ◽  
BANDARU V. RAMARAO
Keyword(s):  
Finite Element ◽  
Plane Deformation ◽  
Strain Analysis ◽  
Local Strain ◽  
Uniaxial Stress ◽  
Material Model ◽  
Element Model ◽  
Plastic Behavior ◽  
Stress Strain ◽  
Strain Fields

Delamination between layers occurs during the creasing and subsequent folding of paperboard. Delamination is necessary to provide some stiffness properties, but excessive or uncontrolled delamination can weaken the fold, and therefore needs to be controlled. An understanding of the mechanics of delamination is predicated upon the availability of reliable and properly calibrated simulation tools to predict experimental observations. This paper describes a finite element simulation of paper mechanics applied to the scoring and folding of multi-ply carton board. Our goal was to provide an understanding of the mechanics of these operations and the proper models of elastic and plastic behavior of the material that enable us to simulate the deformation and delamination behavior. Our material model accounted for plasticity and sheet anisotropy in the in-plane and z-direction (ZD) dimensions. We used different ZD stress-strain curves during loading and unloading. Material parameters for in-plane deformation were obtained by fitting uniaxial stress-strain data to Ramberg-Osgood plasticity models and the ZD deformation was modeled using a modified power law. Two-dimensional strain fields resulting from loading board typical of a scoring operation were calculated. The strain field was symmetric in the initial stages, but increasing deformation led to asymmetry and heterogeneity. These regions were precursors to delamination and failure. Delamination of the layers occurred in regions of significant shear strain and resulted primarily from the development of large plastic strains. The model predictions were confirmed by experimental observation of the local strain fields using visual microscopy and linear image strain analysis. The finite element model predicted sheet delamination matching the patterns and effects that were observed in experiments.

Numerical Modeling and Analytical Investigation of Autofrettage Process on the Fluid End Module of Fracture Pumps

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Mahdi Kiani ◽  
Roger Walker ◽  
Saman Babaeidarabad
Keyword(s):  
Residual Stresses ◽  
Kinematic Hardening ◽  
Analytical Formula ◽  
Strain Analysis ◽  
Material Model ◽  
Analytical Investigation ◽  
Stress Strain ◽  
Element Analysis ◽  
Hardening Material ◽  
Strain Evolution

One of the most important components in the hydraulic fracturing is a type of positive-displacement-reciprocating-pumps known as a fracture pump. The fluid end module of the pump is prone to failure due to unconventional drilling impacts of the fracking. The basis of the fluid end module can be attributed to cross bores. Stress concentration locations appear at the bores intersections and as a result of cyclic pressures failures occur. Autofrettage is one of the common technologies to enhance the fatigue resistance of the fluid end module through imposing the compressive residual stresses. However, evaluating the stress–strain evolution during the autofrettage and approximating the residual stresses are vital factors. Fluid end module geometry is complex and there is no straightforward analytical solution for prediction of the residual stresses induced by autofrettage. Finite element analysis (FEA) can be applied to simulate the autofrettage and investigate the stress–strain evolution and residual stress fields. Therefore, a nonlinear kinematic hardening material model was developed and calibrated to simulate the autofrettage process on a typical commercial triplex fluid end module. Moreover, the results were compared to a linear kinematic hardening model and a 6–12% difference between two models was observed for compressive residual hoop stress at different cross bore corners. However, implementing nonlinear FEA for solving the complicated problems is computationally expensive and time-consuming. Thus, the comparison between nonlinear FEA and a proposed analytical formula based on the notch strain analysis for a cross bore was performed and the accuracy of the analytical model was evaluated.

Residual stress/strain analysis in thin films by X-ray diffraction

1995 ◽  
Vol 20 (2) ◽  
pp. 125-177 ◽  
Author(s):  
I. C. Noyan ◽  
T. C. Huang ◽  
B. R. York
Keyword(s):  
Thin Films ◽  
Residual Stress ◽  
Strain Analysis ◽  
X Ray Diffraction ◽  
Stress Strain ◽  
X Ray

A generic stress–strain model for metallic materials with two-stage strain hardening behaviour

2011 ◽  
Vol 46 (3) ◽  
pp. 519-531 ◽  
Author(s):  
Stijn Hertelé ◽  
Wim De Waele ◽  
Rudi Denys
Keyword(s):  
Strain Hardening ◽  
Metallic Materials ◽  
Stress Strain ◽  
Two Stage ◽  
Strain Model

Residual stress/strain analysis of bulk YBCO superconductors using EBSD

2021 ◽  
pp. 1-1
Author(s):  
Anjela Koblischka-Veneva ◽  
Michael R Koblischka
Keyword(s):  
Residual Stress ◽  
Strain Analysis ◽  
Stress Strain ◽  
Bulk Ybco ◽  
Ybco Superconductors

scholarly journals Numerical and Experimental Stress-Strain Analysis of a Rubber Carousel

TEM Journal ◽  
2021 ◽  
pp. 1662-1667
Author(s):  
Peter Koščák ◽  
Ľubomír Ambriško ◽  
Karol Semrád ◽  
Marasová, Jr. Daniela ◽  
Vladimír Mitrík
Keyword(s):  
Mechanical Load ◽  
Impact Load ◽  
Mechanical Damage ◽  
Strain Analysis ◽  
Material Model ◽  
Stress Strain ◽  
Conveyor Belts ◽  
Optimal Material ◽  
Comparison Of The Results ◽  
The Impact

The effect of the impact load exerted by the baggage impacting light baggage carousels may be manifested as mechanical damage to the carousel as a result of the stress-strain processes. In order to describe the phenomena related to the baggage impact, it is important to monitor the tensile strength of rubber carousels of light conveyor belts intended for the conveyance of baggage at airports. The output of the article is monitoring the mechanical load of the carousel, the comparison of the results thereof with the outputs of the CAE analysis, as well as the determination of the optimal material model and the approximation thereof to the experimental model.

Material Model Parameters for the Giuffrè-Menegotto-Pinto Uniaxial Steel Stress-Strain Model

2020 ◽  
Vol 146 (2) ◽  
pp. 04019205 ◽  
Author(s):  
R. Carreño ◽  
K. H. Lotfizadeh ◽  
J. P. Conte ◽  
J. I. Restrepo
Keyword(s):  
Material Model ◽  
Model Parameters ◽  
Stress Strain ◽  
Strain Model

Heart Composite Material Model for Stress-Strain Analysis

2003 ◽  
Author(s):  
Zhenhua Hu ◽  
Dimitris Metaxas ◽  
Leon Axel
Keyword(s):  
Fiber Orientation ◽  
Strain Energy ◽  
Strain Analysis ◽  
Material Model ◽  
Time Step ◽  
Stress Strain ◽  
Energy Functions ◽  
Strain Energy Functions

Mechanical properties of the myocardium have been investigated intensively in the past four decades. Due to the non-linearity and history dependence of myocardial deformation, many complex strain energy functions have been used to describe the stress-strain relationship in the myocardium. These functions are good at fitting in-vitro experimental data from myocardial stretch testing into strain energy functions. However, it is difficult to model in-vivo myocardium by using strain energy functions. In a previous paper [1], we have implemented a transversely anisotropic material model to estimate in-vivo strain and stress in the myocardium. In this work, the fiber orientation is updated at each time step from the end of diastole to the end of systole; the stiffness matrix is recalculated using the current fiber orientation. We also extend our model to include residual ventricular stresses and time-dependent blood pressure in the ventricular cavities.

scholarly journals Structural-phenomenological stress-strain model for concrete

2019 ◽  
Vol 221 ◽  
pp. 01014
Author(s):  
Maksim Danilov ◽  
Pavel Bardaev
Keyword(s):  
Mathematical Model ◽  
Strain State ◽  
Heterogeneous Materials ◽  
Mathematical Apparatus ◽  
Stress Strain ◽  
Stress Strain State ◽  
Software Packages ◽  
The Relationship ◽  
Strain Model

This work is devoted to the improvement mathematical apparatus for describing the stress-strain state of structures made of heterogeneous materials and modeling the processes of their deformation under load. The proposed mathematical model establishes the relationship between the components of the macrostrains tensor and the components of the macrostress tensor and explicitly takes into account the heterogeneity of the material. The model can be used in finite-elemental software packages.

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