The large strain nonlinear stress-strain behavior of thermoplastic polyurethanes (TPUs) exhibits strong hysteresis, rate dependence and softening. Thermoplastic polyurethanes are copolymers composed of hard and soft segments. The hard and soft segments phase separate to form a microstructure of hard and soft domains typically on a length scale of a few tens of nanometers. Studies have revealed ...

This paper proposes a computational framework for the design optimization of stable structures under large deformations by incorporating nonlinear buckling constraints. A novel strategy suppressing spurious modes related to low-density elements is proposed. The depends on constructing pseudo-mass matrix that assigns small pseudo masses DOFs surrounded only and degenerates an identity solid regi...

There are some materials in nature that experience deformations not elastic. Viscoelastic of them. We come across many such our daily lives through a number interesting applications engineering, material science and medicine. This article concerns itself with modelling the nonlinear response class viscoelastic solids. In particular, viscoelasticity strain rate type, which can be described by co...

2.02.4.1 Finite-strain Effects in Bulky or Massive Bodies 71 2.02.4.2 Nonlinear Finite-strain Effects in Columns, Plates and Shells Soft in Shear 72 2.02.4.3 Discrepancy between Engesser’s and Haringx’s Formulas: New Paradox and its Resolution 73 2.02.4.4 Shear Stiffness Associated with Second-order Strain 74 2.02.4.5 Differential Equations of Equilibrium Associated with Different Finite-strain...