Abstract
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.
Original language | English |
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Pages (from-to) | 1203-1218 |
Number of pages | 16 |
Journal | Engineering Fracture Mechanics |
Volume | 71 |
Issue number | 9-10 |
DOIs | |
Publication status | Published - 2004 |
Externally published | Yes |
Keywords
- Crack tip constraint
- Finite element analysis
- J-integral
- Plastic η factor
- Thickness effect
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering