Abstract
Abstract Integrity assessment and life prediction of components under cyclic loading make use of crack growth data determined under opening mode (mode I). However, many service failures occur from growth of cracks subjected to mixed mode loadings, combinations of modes I, II and III. Many efforts to determine crack growth behavior under mixed mode loading have been reported. Many different specimen geometries have been used to produce different combinations of mixed mode loadings under different test conditions. A set of loading grips were designed and fabricated to carry out fracture and fatigue crack growth (FCG) tests using standard compact tension (CT) specimens under mode I+II loading with different levels of mode mixity. Mixed mode FCG experiments were carried out at room temperature on SS 316 LN with a load ratio 0.1, and cyclic loading frequency 15 Hz. Crack growth was monitored using DCPD technique. The FCG results are discussed in terms of KI (Mode-I) and KII (Mode-II) components and combined stress intensity factor KV at different loading angles. The results are compared with those under pure mode I loading.
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