Numerical evaluation for debonding failure phenomenon of adhesively bonded joints at cryogenic temperatures

A temperature- and strain-rate-dependent isotropic elasto-viscoplastic model for glass-fiber-reinforced polyurethane foam

“…In nonlinear material problems, a large amount of computational time and cost is required because of the complex calculations involved in stress updates. To overcome this obstacle, a novel numerical scheme, namely, the consistent tangent modulus (CTM) method, was proposed by researchers [17][18][19][20], which was successfully adopted for isotropic and anisotropic constitutive-damage models [21][22][23][24][25]. Therefore, in the present study, the CTM method was employed to describe the temperature-and strain-rate-dependent nonlinear material behavior of RPUF.…”

Anisotropic elasto-viscoplastic damage model for glass-fiber-reinforced polyurethane foam

“…The algorithmic tangential stiffness (ATS) method was proposed to reduce the computational time and cost, and it has been successfully applied to isotropic elasto-viscoplastic damage models. [17][18][19] In the present study, the ATS method was also applied to the proposed anisotropic elasto-viscoplastic damage model to describe the material nonlinear behavior and damage growth of RPUF.…”

“…UMAT is one of the most commonly used material cards for material nonlinear and damage analysis, and the authors have already developed a number of UMATs to demonstrate material nonlinearities such as the second-hardening problem of austenitic stainless steel 17,18 and the hardening-softening coupling problem of adhesively bonded joints. 19 In the present study, the developed UMAT was extended as a fourth-order tensor system that describes not only the anisotropic material behavior but also the damage growth of the initially anisotropic materials.…”

“…To overcome these problems, a new type of anisotropic elasto-viscoplastic damage model that does not depend on the yield/damage surfaces and loading paths was proposed by Bodner et al [12][13][14][15] In this model, the inelastic material behavior is derived from the initial, saturated, and fully annealed hardening and softening parameters, which are functions of the plastic work and damage variables. Based on these material parameters, the material nonlinear behavior and defects of some materials such as austenitic stainless steel [16][17][18] and adhesively bonded joints 19 have been successfully described numerically and computationally.…”

Initial and progressive failure analyses for composite laminates using Puck failure criterion and damage-coupled finite element method

“…Lee et al[23] employed the Gurson-Tvergaard void growth model to identify the debonding failure problem of adhesively bonded joints. Kim et al[24,25], Lee et al[26] and Kim et al[27] used the isotropic Bodner-Chan damage model to describe the crack propagation problems as well as the damage-induced viscoplastic behavior of…”