โ Scribed by P. Doig; R.F. Smith; P.E.J. Flewitt
No coin nor oath required. For personal study only.
Abstrxt-The ev~uation of fracture toughness from stretch zone measurements on test piece fracture surfaces using selective backscattered electron imaging in the scanning electron microscope is described. Results are compared with the initiation toughness values obtained using single specimen R curve procedures.
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Abshnct-The specimen strength ratio (R,) determined from small specimen tests was correlated with plane strain fracture toughness (RI,) values for many beats of AS33B-1 steel. A variety of toading rate and specimen size results suggest that K,, can be predicted from the small specimen strength ratio
Ahabnet-The trend toward broader application of high-strength structural alloys has increased the potential for failure by low-cycle fatigue crack propagation. There is a signiBcant probability that complex structures will contain undetected cracks remaining from fabrication or that cracks will read
Chinese abstract5 and where where F $ = -0.071 -.-0.535 zL! +0.169 2 2+0.020 g ' -1.071 ( > (W) (W) (W) I&+ (l-8 and according to the concept of Irwin and D-M modes of treating the crack tip plastic Lone. we have obtained respectively the elastic-plastic equations of crack opening displacement at cr