Extended subloading surface model based on multiplicative finite strain elastoplasticity framework: constitutive formulation and fully implicit return-mapping scheme

Abstract

This paper presents a finite strain elastoplastic constitutive model incorporating the extended subloading surface concept within the unconventional plasticity framework for cyclic loadings. This is a reformulated and extended version of the small strain model [Iguchi et al., Trans. JSME (in Japanese), Vol. 82 (2016), No. 841 p. 16-00197]. The constitutive formulation is underpinned by the multiplicative decomposition of the deformation gradient tensor, which is the wellestablished modern kinematical framework in geometrically nonlinear elastoplasticity. In addition to the conventional multiplicative decomposition into elastic and plastic parts, we further introduce two kinds of multiplicative decompositions of the plastic deformation gradient tensor. One decomposition is related to kinematic hardening, and the other an evolution of the elastic-core tensor, i.e. a key internal variable in the extended subloading surface model, which stands for a stress state where the material exhibits most elastic responses. In each decomposition, the plastic deformation gradient tensor is split into an energetic part and a dissipative part, and the former is related to the back-stress tensor for kinematic hardening or the elastic-core tensor defined on a pertinent intermediate configuration via a hyperelastic format. Therefore, the whole constitutive theory can be formulated in terms of deformation-like tensorial variables without resort to any objective or co-rotational rates of stress-like variables such as the back-stress, fulfilling the principle of material frame indifference. We then focus on the numerical stress update scheme for the proposed material model based on the fully implicit return-mapping. Basic properties of the proposed model, as well as the capability of the developed numerical scheme, are examined and verified through numerical examples.

Elaborated subloading surface model for accurate description of cyclic mobility in granular materials

“…was used by Hashiguchi [30], Hashiguchi and Ueno [39], Iguchi et al [45][46][47], etc., wherê n c of ðc; bÞ oc 0 of ðc; bÞ oc ð26Þ which is the normalized outward-normal of the elastic-core surface at the current elastic-core c. It cannot be applicable to the generic deformation behavior, since it depends only on the unit outward-normal tensors n andn c independent of the size and the shape of the normal-yield surface as seen in the right-hand side of Eq. ( 25).…”

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

“…The implicit stress integration algorithms for the subloading surface model have been studied in various approaches. [11][12][13][14][15][16][17][18] However, they are not applicable to the description of the cyclic loading behavior. They are limited to the descriptions of the monotonic loading behaviors because the incorrect loading criterion is used in them, which is based on the premise that the subloading surface expands in the plastic loading process.…”

“…The implicit stress integration algorithms for the subloading surface model have been studied in various approaches . However, they are not applicable to the description of the cyclic loading behavior.…”