TypeConference
TitleELASTIC-PLASTIC ANALYSIS OF SURFACE CRACKS IN ROUND BARS UNDER TENSION LOADING
SourceRTC 048
AuthorA.E Ismail, A.K Ariffin, S. Abdullah, M.J Ghazali

Abstract

Round solid cylindrical-shaped bars have great important applications in power transmission and cracks normally occurred on the surface due to several factors such corrosions and material defects. Therefore, the failure predictions on the cracked components have a major safety issue. In this work, an elastic-plastic finite element analysis is conducted to investigate the failure behaviour of cracked round bars under tension stress. Different crack aspect ratio, a/b and relative crack depth, a/D are selected ranging between 0.6 to 1.2 and 0.1 to 0.3 respectively. Two strain hardening exponents, n are used 5 and 10 in order to simulate higher and lower hardening behaviour of the material and the material stress/strain are assumed to follow the Ramberg-Osgood relation. During the loading, the J-integral are calculated for several points along the crack fronts, x/h. Then, the limit load of the components are computed according to the reference stress method and it is strongly depend on the a/b, a/D, x/h and n. Subsequently, the limit load is validated whether it is capable to predict the J-integral along the crack fronts. According to the results, the present limit load capable to predict the Jintegral under tension force. However, the predictions are limited within certain crack geometries. 


Content

RTC 048