A numerical framework for analyzing steady-state elastic–plastic material deformation at finite strains is developed and demonstrated in the present work. The an extension of original method by Dean Hutchinson (1980) develop to analyze crack propagation, under a small strain assumption, which history-dependent response captured through streamline integration. Steady-state problems are encounter...

This paper deals with formulation of constitutive relations describing the time-dependent deformation in sedimentary rocks. In contrast to classical viscoplasticity, the creep effects are attributed here to a progressive evolution of material microstructure. First, an internal variable monitoring the degradation process is introduced followed by presentation of a general framework of chemo-plas...

A molecular-dynamics study of ductile and brittle fracture in model noncrystalline solids Abstract Molecular-dynamics simulations of fracture in model amorphous solids are shown to exhibit brittle or ductile behavior depending on small changes in interatomic potential. Yet, simulations of these two model solids under pure shear reveal no significant difference in their ultimate yield stress. To...

We propose a nonlinear extension of the standard tube model for semidilute solutions of freely-sliding semiflexible polymers. Nonaffine filament deformations at the entanglement scale, the renormalisation of direct interactions by thermal fluctuations, and the geometry of large deformations are systematically taken into account. The stiffening response predicted for athermal solutions of stiff ...

A typical aerospace composite component can be modeled on (at least) three different scales: (i) macroscale (structural level), (ii) mesoscale (laminate level), and (iii) microscale (the level of microconstituents). Additional scales can be introduced into the model. For example, the scale of material heterogeneity in each microphase, such as dislocations and grain boundaries, could be consider...

A thermal fatigue lifetime prediction model of ceramic ball grid array (CBGA) packages is proposed based on the Darveaux model. finite element CBGA established, and Anand used to describe viscoplasticity solder. The average viscoplastic strain energy density increment ΔWave obtained using a simulation, influence different structural parameters analyzed. simplified analytical established simulat...