UNIVERSAL WEIGHT FUCTION METHOD

FOR MECHANICAL AND THERMAL

LOADING AND ITS APPLICATION

ZHOU Guobin  LU Yanlin

(The Ministry of Education Key Laboratory of Mechanical Manufacture and Automation,

Zhejiang University of Technology, Hangzhou 310032 )

Abstract: The thermal weight function (TWF) method is extended to the universal weight function (UWF) method suitable for mechanical and thermal loadings. The UWF is dependent only on the crack configuration and body geometry, and is in-dependent of time and loads. The finite element implementation of the UWF method for 3-D Mode I cracks subjected to me-chanical and thermal loadings is given by using the multiple virtual crack extension (MVCE) method. The UWF method is especially suitable for determining the variation of transient stress intensity factors (SIFs) of a cracked body subjected to thermal and mechanical shock. Numerical results show that UWF method is of high efficiency and of good accuracy as the COD method.

Key words: Universal weight function method Multiple virtual crack extension method Stress intensity factor Finite element method

CLC No: O346.1 TG405

国家自然科学基金(50675206)和浙江省教育厅基金(20051396)资助项目. Received 20061219, received in revised form 20070327