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...

An application of advanced optimization techniques to solve the path planning problem for closed chain robot systems is proposed. The approach to path planning is formulated as a “quasi-dynamic” NonLinear Programming (NLP) problem with equality and inequality constraints in terms of the joint variables. The essence of the method is to find joint paths which satisfy the given constraints and min...

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...

The paper reviews the modeling of damage by the microplane model and presents extensions required for cyclic loading. The general microplane constitutive model is implemented in a three-dimensional finite element code and used in damage and bifurcation analysis of various structures. The results of the analysis are compared with test results and some of the comparisons are shown in the present ...

Elastic field coupling to solute concentration is known to produce dislocationdriven impurity segregation. Recent reports detailing the distribution of boron around edge dislocations in B2-ordered FeAl indicate that nonlinear coupling of species concentration and elastic strain to the chemical potential must be considered to assess the magnitude of boron segregation around edge dislocations. On...