Abstract
The present paper provides the plastic η factor solutions for J testing of single-edge-cracked specimens in four-point bend (SE(PB)), based on limit (slip line field) and detailed finite element limit analyses. Both homogeneous specimens and bi-material specimens with interface cracks are considered. Moreover, two different η factor solutions are developed, one for J (or C * in creep crack growth testing) estimation based on the load–load line displacement (LLD) records, η p VLL, and the other J estimation based on the load-crack mouth opening displacement (CMOD) records, η p CMOD. It is found that the use of load–LLD records can be recommended only for testing deeply cracked SE(PB) specimens. Moreover, depending on how the LLD is measured, a different value of η p VLL should be used. On the other hand, the use of load–CMOD records is recommended for all possible crack lengths. Moreover, the proposed η p CMOD solution can be used not only for a homogeneous specimen but also for any bi-material specimen with an interface crack.
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