scholarly journals Effect of Material Hardening Model for Canister on Finite Element Cask Drop Simulation for Strain-Based Acceptance Evaluation

2021 ◽  
Author(s):  
Hune-Tae Kim ◽  
Jun-Min Seo ◽  
Ki-Wan Seo ◽  
Seong-Ho Yoon ◽  
Yun-Jae Kim ◽  
...  
Keyword(s):  
Finite Element ◽  
Hardening Model

scholarly journals Analysis of Undrained Seismic Behavior of Shallow Tunnels in Soft Clay Using Nonlinear Kinematic Hardening Model

2020 ◽  
Vol 10 (8) ◽  
pp. 2834
Author(s):  
Mohsen Saleh Asheghabadi ◽  
Xiaohui Cheng
Keyword(s):  
Finite Element ◽  
Kinematic Hardening ◽  
Soft Clay ◽  
Hysteresis Loops ◽  
Stiffness Degradation ◽  
Triaxial Tests ◽  
Embedment Depth ◽  
Ground Acceleration ◽  
Cyclic Shear ◽  
Hardening Model

In this study, a soil–tunnel model for clay under earthquake loading is analyzed, using finite element methods and a kinematic hardening model with the Von Mises failure criterion. The results are compared with those from the linear elastic–perfectly plastic Mohr–Coulomb model. The latter model does not consider the stiffness degradation caused by imposing cyclic loading and unloading to the soil, whereas the kinematic hardening model can simulate this stiffness degradation. The parameters of the kinematic hardening model are calibrated based on the results of experimental cyclic tests and finite element simulation. Here, two methods—one using data from cyclic shear tests, and the other a new method using undrained cyclic triaxial tests—are used to calibrate the parameters. The parameters investigated are the peak ground acceleration (PGA), tunnel lining thickness, tunnel shape, and tunnel embedment depth, all of which have an effect on the resistance of the shallow tunnel to the stresses and deformations caused by the surrounding clay soils. The results show that unlike traditional models, the nonlinear kinematic hardening model can predict the response reasonably well, and it is able to create the hysteresis loops and consider the soil stiffness degradation under the seismic loads.

3-D Elastic-Plastic Constitutive Relationship of Mixed Hardening

2012 ◽  
Vol 249-250 ◽  
pp. 927-930
Author(s):  
Ze Yu Wu ◽  
Xin Li Bai ◽  
Bing Ma
Keyword(s):  
Finite Element ◽  
Constitutive Relation ◽  
Kinematic Hardening ◽  
Constitutive Relationship ◽  
Isotropic Hardening ◽  
Element Analysis ◽  
Hardening Model ◽  
Elastic Plastic ◽  
Mixed Hardening ◽  
Advantages And Disadvantages

In finite element calculation of plastic mechanics, isotropic hardening model, kinematic hardening model and mixed hardening model have their advantages and disadvantages as well as applicability area. In this paper, by use of the tensor analysis method and mixed hardening theory in plastic mechanics, the constitutive relation of 3-D mixed hardening problem is derived in detail based on the plane mixed hardening. Numerical results show that, the proposed 3-D mixed hardening constitutive relation agrees well with the test results in existing references, and can be used in the 3-D elastic-plastic finite element analysis.

Revisiting the Deshpande-Fleck Foam Model

2019 ◽  
Vol 803 ◽  
pp. 134-139
Author(s):  
Chang Feng Zhu ◽  
Zhi Jun Zheng ◽  
Shi Long Wang ◽  
Kai Zhao ◽  
Ji Lin Yu
Keyword(s):  
Finite Element ◽  
Plastic Strain ◽  
Equivalent Plastic Strain ◽  
Element Model ◽  
The Self ◽  
Isotropic Hardening ◽  
Hardening Model ◽  
Foam Model ◽  
A Cell ◽  
Self Similar

The self-similar isotropic hardening model developed by Deshpande and Fleck has been widely used. An important issue in this model is to determine the value of ellipticity. The ellipticity was treated as a constant in the subsequent yield, but different values were suggested in the literature. In this paper a cell-based finite element model based on the 3D Voronoi technique is used to verify the Deshpande-Fleck foam model. It is found that the ellipticity determined from uniaxial and hydrostatic compressions varies with the equivalent plastic strain.

Investigation of Strain Hardening in NiAl Single Crystals Using Three-Dimensional FEA Models

1999 ◽  
Vol 123 (1) ◽  
pp. 20-27 ◽  
Author(s):  
Chulho Yang ◽  
Ashok V. Kumar
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Strain Hardening ◽  
Single Crystals ◽  
Three Dimensional ◽  
High Rate ◽  
Large Strains ◽  
Slip Systems ◽  
Element Analysis ◽  
Hardening Model

Single crystals of NiAl are very ductile at intermediate temperatures (400–700 K) and were observed to exhibit high strain hardening rates at large strains when loaded in the [110] orientation. The experimentally observed strain hardening in NiAl single crystals could not be predicted using simple hardening models and two-dimensional finite element analysis. The primary slip systems that activate during the deformation are (010)[100] and (100)[100], however, it has been hypothesized that activation of secondary slip on {011} slip planes may be responsible for the high rate of hardening observed. The hardening of intermetallic single crystals when multiple slip systems are activated is not well understood. To study this further, a three-dimensional hardening model and constitutive equations were implemented into a finite element analysis program. Since the parameters required to describe the hardening model such as latent hardening ratios are difficult to obtain experimentally, a parametric study was conducted to estimate values for these parameters that enable the prediction of the experimentally observed load versus elongation curves.

Application of Elastic-Plastic Design Data in the New ASME B&PV Code Section VIII Division 2

2010 ◽  
Author(s):  
David J. Dewees
Keyword(s):  
Finite Element ◽  
Pressure Vessel ◽  
Plastic Material ◽  
Kinematic Hardening ◽  
Strain Curve ◽  
Design Data ◽  
Hardening Model ◽  
Elastic Plastic ◽  
Section Viii ◽  
Division 2

The updating and re-writing of the ASME Boiler and Pressure Vessel Code, Section VIII Division 2 (2007) [1] has introduced several new and unique features. One of these features is the inclusion of specific materials data for use in elastic-plastic analysis of pressure vessel components. Both monotonic and cyclic stress strain curve models are provided, with supporting constants for a range of materials and temperatures. The elastic-perfectly plastic material model has been used in commercial Finite Element (FE) codes for many years to perform limit load and ratcheting analyses. The new material models and data of Section VIII Division 2 (S8D2) include strain hardening and are intended for use in deformation assessments, and for determining cyclic plastic strain ranges in fatigue evaluations. This paper presents one possible implementation of the Code models and data into a standard cyclic hardening model; the multiple backstress, nonlinear kinematic-hardening model of Chaboche, as implemented in the commercial Finite Element program Abaqus, versions 6.8 and later.

Interactive Texture- and Finite-Element Simulation Including the Bauschinger Effect

2005 ◽  
Vol 495-497 ◽  
pp. 1523-1528 ◽  
Author(s):  
Tom Walde ◽  
Hermann Riedel
Keyword(s):  
Finite Element ◽  
Bauschinger Effect ◽  
Texture Evolution ◽  
Plastic Anisotropy ◽  
Rolling Process ◽  
Finite Element Code ◽  
Combined Model ◽  
Hardening Model ◽  
Texture Model ◽  
Element Simulation

In this paper we describe a rolling simulation considering the main sources of plastic anisotropy, namely the Bauschinger effect and crystallographic texture. For this purpose we coupled the VPSC-model of Lebensohn and Tomé [1] with the hardening model of Peeters et al. [2]. The combined model is implemented in the Finite-Element code ABAQUS/Explicit®. With the combination of finite-element method, VPSC-texture model and the hardening model a rolling process is simulated and the nfluence of the Bauschinger effect on the texture evolution is studied.

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