Complete implicit stress integration algorithm with extended subloading surface model for elastoplastic deformation analysis

2019 ◽  
Vol 121 (5) ◽  
pp. 945-966 ◽  
Author(s):  
Takuya Anjiki ◽  
Masanori Oka ◽  
Koichi Hashiguchi
Keyword(s):  
Elastoplastic Deformation ◽  
Deformation Analysis ◽  
Surface Model ◽  
Integration Algorithm ◽  
Stress Integration

An effective stress model for creep of clay

1995 ◽  
Vol 32 (5) ◽  
pp. 819-834 ◽  
Author(s):  
Mohammed M. Morsy ◽  
D.H. Chan ◽  
N.R. Morgenstern
Keyword(s):  
Finite Element ◽  
Pore Pressure ◽  
Effective Stress ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Surface Model ◽  
Interpolation Technique ◽  
Stress Integration ◽  
Integration Algorithms ◽  
Double Yield

An effective stress constitutive model to study the problem numerically of creep in the field is presented. A double-yield surface model for the stress–strain–time behaviour of wet clay is described. The model adopts the concept of separating the total deformation into immediate and delayed components. The yield surfaces employed are the modified Cam-clay ellipsoid and the Von Mises cylinder inscribed in the ellipsoid. The proposed numerical scheme incorporates the pore pressure based on field observations into a finite element analysis. An interpolation technique is used to determine the pore pressure at every element. A field example is presented to illustrate the interpolation technique procedure. The scheme not only avoids the complexity of making predictions of pore-water pressure, but also allows the analysis to be carried out in terms of effective stresses based on the actual observed pore pressure. Two stress integration algorithms based on the implicit calculation of plastic strain are implemented and tested for the double-yield surface model. A numerical simulation of stress-controlled drained creep tests confirms the numerical procedure. Key words : constitutive equations, creep, finite element, stress integration algorithms, effective stress approach, pore-water pressure.

A Corotational Elastoplastic Formulation With Subloading Surface Model for Hardening Materials

Volume 1 ◽  
2004 ◽  
Author(s):  
Ali Reza Saidi ◽  
Koichi Hashiguchi
Keyword(s):  
Constitutive Model ◽  
Strain Rate ◽  
Simple Shear ◽  
Deformation Theory ◽  
Elastoplastic Deformation ◽  
Strain Tensor ◽  
Surface Model ◽  
Strain Rate Tensor ◽  
Hencky Strain ◽  
Stress Components

In this paper a corotational constitutive model for the large elastoplastic deformation of hardening materials using subloading surface model is formulated. This formulation is obtained by refining the large deformation theory of Naghdabadi and Saidi (2002) adopting the corotational logarithmic (Hencky) strain rate tensor and incorporating it into the subloading surface model of Hashiguchi (1980, 2003) falling within the framework of the unconventional plasticity. As an application of the proposed constitutive model, the large Elastoplastic deformation of simple shear example has been solved and the results have been compared with classical elasto-plastic model using the Hencky strain tensor. Also the effect of the choice of corotational rates on stress components has been studied.

scholarly journals J031012 Application of the Extended Subloading Surface Model for the Cyclic Plastic Deformation Analysis of Metals

2012 ◽  
Vol 2012 (0) ◽  
pp. _J031012-1-_J031012-3
Author(s):  
Noriyuki SUZUKI ◽  
Takuya KUWAYAMA ◽  
Shigeru OGAWA ◽  
Masami UENO ◽  
Koichi HASHIGUCHI
Keyword(s):  
Plastic Deformation ◽  
Deformation Analysis ◽  
Surface Model ◽  
Cyclic Plastic ◽  
Cyclic Plastic Deformation

Welding deformation analysis of aluminum alloy and steel sheet metal parts based on resistance spot welding

2018 ◽  
Vol 233 (3) ◽  
pp. 797-806 ◽  
Author(s):  
Yanfeng Xing ◽  
Fang Wang ◽  
Jingjing Lu ◽  
Sha Xu
Keyword(s):  
Aluminum Alloy ◽  
Orthogonal Design ◽  
Deformation Analysis ◽  
Welding Parameters ◽  
Surface Model ◽  
Welding Deformation ◽  
Deformation Method ◽  
Element Analysis ◽  
Sheet Metal Parts ◽  
Auto Body

Auto-body lightweight is becoming an important trend of energy saving and emission reduction. Various materials assembled together would be used to fabricate the auto-body to satisfy this demand. However, the assembly dimensional quality is difficult to be controlled in the real processing due to the huge differences in material properties. Therefore, it is necessary to control and analyze the welding deformation of aluminum alloy and steel. In this work, the orthogonal design experiment has been adopted to analyze the welding deformation of steel–aluminum sheet parts. Subsequently, the response surface model is proposed to establish the relationship between welding deformation and welding parameters by finite element analysis, which is verified by physical experiments again. Meanwhile, the anti-deformation method is also used to decrease the assembly deformation successfully. And the case of Z-shaped planes is applied to further illustrate the proposed method of this work. Finally, the results show that both the methods have a good simulation effect and a high prediction accuracy for the assembly dimensional quality.

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