Article

# A combined parametric quadratic programming and precise integration method based dynamic analysis of elastic-plastic hardening/softening problems

Acta Mechanica Sinica (Impact Factor: 0.62). 12/2002; 18(6):638-648. DOI: 10.1007/BF02487966

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**ABSTRACT:**4-node, 8-node and 8(4)-node quadrilateral plane isoparametric elements are used for the solution of boundary value problems in linear isotropic Cosserat elasticity. The patch test is applied to validate the finite elements. Engineering problems of stress concentration around a circular hole in plane strain condition and mechanical behaviors of heterogeneous materials with rigid inclusions and pores are computed to test the accuracy and capability of these three types of finite elements.Acta Mechanica Sinica 07/2005; 21(4):388-394. · 0.62 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**Purpose – An improved mathematical programming method for numerical simulation of cloth wrinkling is investigated. Design/methodology/approach – Cloth is modeled as the network of bars (called bar network) or membrane elements with a special nonlinear mechanical constitutive law in the finite element analysis. Findings – Compared with conventional numerical methods, the proposed method does not depend on stress iteration, but on the base exchanges in the solution of a standard quadratic programming problem. Thus, the new method presents very good convergence behavior and accurate predictions of wrinkling patterns and stress distributions of cloths. Numerical results demonstrate the validity and the efficiency of the proposed method. Originality/value – From the engineering point of view, accurate numerical methods are required in wrinkling analysis of cloth deformation. The algorithm developed here also can be applied into fields such as large deformation under wind load and dynamic behaviors of cloths.International Journal of Clothing Science and Technology 02/2005; 17(1):13-28. · 0.33 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**In the present paper, a multi-linearity method is used to address the nonlinear slip control equation for the hydrodynamic analysis of a two-dimensional (2-D) slip gap flow. Numerical analysis of a finite length slider bearing with wall slip shows that the surface limiting shear stress exerts complicated influences on the hydrodynamic behavior of the gap flow. If the slip occurs at either the stationary surface or the moving surface (especially at the stationary surface), there is a transition point in the initial limiting shear stress for the proportional coefficient to affect the hydrodynamic load support in two opposite ways: it increases the hydrodynamic load support at higher initial limiting shear stresses, but decreases the hydrodynamic load support at lower initial limiting shear stresses. If the slip occurs at the moving surface only, no fluid pressure is generated in the case of null initial limiting shear stress. If the slip occurs at both the surfaces with the same slip property, the hydrodynamic load support goes off after a critical sliding speed is reached. A small initial limiting shear stress and a small proportionality coefficient always give rise to a low friction drag.Acta Mechanica Sinica 12/2007; 23(6):655-661. · 0.62 Impact Factor

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