Hits:

Indexed by:期刊论文

Date of Publication:2017-08-01

Journal:SCIENCE CHINA-TECHNOLOGICAL SCIENCES

Included Journals:Scopus、SCIE、EI、CSCD

Volume:60

Issue:8

Page Number:1211-1220

ISSN No.:1674-7321

Key Words:T-stress; finite element; CCBD specimen

Abstract:A method that uses finite element analysis to determine the non-singular stress (T-stress) at a crack tip is proposed in this study. T-stress includes two components: the T (x) -stress parallel to the tangent of the crack at its tip and the T (y) -stress perpendicular to this tangent. The effects of contact and friction on both the T (x) - and T (y) -stresses on the crack flanks are considered in the method. Because the method uses a single standard elastic finite element analysis derived directly from the equation of the stress fields around the crack tip and does not require any assumptions or simplification, it can be used to determine the T-stress for any given geometry and loading condition. Theoretical results are used to calibrate the results, which exhibited good agreement and to discuss the T-stress computational methodology. Furthermore, the T (x) - and T (y) -stresses in center-cracked Brazilian disc (CCBD) specimens subjected to diametrical or partially distributed compression were numerically computed, and the effects of contact and friction on the T (x) - and T (y) -stresses are discussed.