3-D constraint effects on J testing and crack tip constraint in M(T), SE(B), SE(T) and C(T) specimens: numerical study

• Published in: Engineering fracture mechanics Vol. 71; no. 9; pp. 1203 - 1218
• Main Authors: Kim, Yun-Jae, Kim, Jin-Su, Cho, Soo-Man, Kim, Young-Jin
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2004
• Subjects: Crack tip constraint; Finite element analysis; J-integral; Plastic η factor; Thickness effect; Crack tip constraint; Thickness effect; J-integral; Finite element analysis; Plastic η factor
• ISSN: 0013-7944; 1873-7315
• DOI: 10.1016/S0013-7944(03)00211-X

This paper compiles solutions of plastic η factors and crack tip stress triaxialites for standard and non-standard fracture toughness testing specimens, via detailed three-dimensional (3-D) finite element (FE) analyses. Fracture toughness testing specimens studied include a middle cracked tension (M(T)) specimen, SE(B), single-edge cracked bar in tension (SE(T)) and C(T) specimen. The ligament-to-thickness ratio of the specimen is systematically varied. It is found that the use of the CMOD overall provides more robust experimental J estimation than that of the LLD, for all cases considered in the present work. Moreover, the J estimation based on the load–CMOD record is shown to be insensitive to the specimen thickness, and thus can be used for testing a specimen with any thickness. Furthermore, effects of in-plane and out-of-plane constraint on the crack tip stress triaxiality are quantified, so that when an experimental J value is estimated according to the procedure recommended in this paper, the corresponding crack tip stress triaxiality can be estimated. Moreover, it is found that the out-of-plane constraint effect is related to the in-plane constraint effect.