Stable ductile crack growth in 3 mm thick AISI 304 stainless steel specimens has been investigated experimentally and numerically. Multi-linear Isotropic Hardening method coupled with the Von-Mises yield criterion was adopted for modeling elasto-plastic behavior of the material. Mode-I CT fracture specimens have been tested to generate experimental load-displacement-crack growth data during sta...

The concept of the local approach is applied to investigate different damage mechanisms of structural steels by micromechanical material models. Static and dynamic fracture resistance curves for a neutron-embrittled weld material are derived from tensile and Charpy-type specimens with the modified Gurson model. The behaviour of a test piece with a crack in the fenitic base material beneath an a...

In this paper a new anisotropic model for time-dependent behaviour of soft soils is presented. The formulation is based on a previously developed isotropic creep model, assuming rotated Modified Cam Clay ellipses as contours of volumetric creep strain rates. A rotational hardening law is adopted to account for changes in anisotropy due to viscous strains. Although this will introduce some new s...

A viscoplastic deformation model considering material damage is used to predict hot tear formation in a permanent mold magnesium alloy casting. The simulation model calculates the solid deformation and ductile damage. The viscoplastic constitutive theory accounts for temperature dependent properties and includes creep and isotropic hardening. Ductile damage theory is used to find mechanically i...

We study topology optimization in quasi-static plasticity with linear kinematic and isotropic hardening using a level-set method. consider the primal variational formulation for problem. This is subjected to penalization regularization, resulting an approximate problem that shape-differentiable. The shape derivative computed adjoint Thanks proposed time discretization of proved be well-posed. F...

Solder materials are critical packaging compounds and due to usually weakest melting temperature among packaging constitutive materials, thus, they are frequently subjected to a multitude of physical phenomena: creep, fatigue and combined hardening effects. The complexity and interaction of such factors must be considered in suitable way in the mechanical behavior modeling using the appropriate...

Abstract Today, the hardening Yoshida-Uemori model is implemented in most used FEA stamping codes (Autoform®, Pamstamp®, LS-Dyna®…) with occasionally some variations. This forming material card requested regularly by car manufacturers. The a combined coupled elastic evolution modulus which depends on equivalent plastic strain. According to experimental tests conducted and their identification p...

We present in this paper the characterization of the variational structure behind the discrete equations defining the closest-point projection approximation in elastoplasticity. Rate-independent and viscoplastic formulations are considered in the infinitesimal and the finite deformation range, the later in the context of isotropic finite strain multiplicative plasticity. Primal variational prin...

A new class of hierarchical fractal-like honeycombs inspired by the topology of the “spiderweb” were introduced and their small and large deformations were investigated analytically, numerically, and experimentally. Small deformation elasticity results show that the isotropic in-plane elastic moduli (Young’s modulus and Poisson’s ratio) of the structures can be controlled over several orders of...

The stress distribution in torsionally deformed cylindrical polycrystalline copper samples was investigated. The strain in torsional deformation changes with distance from the torsional axis and thus the local extent of work hardening and consequently the local flow stress changes as well. The variation of the flow stress with radial position in the samples was measured by microhardness tests. ...