Elastic and Plastic Analysis of a Single Edge Cracked Tension Specimen with Clamped Ends

摘要

An analysis of single edge cracked tension specimens with clamped end conditions was conducted. Single edge tension finite element models at nine crack lengths were constructed and benchmarked against previously accepted analyses with pinloaded boundary conditions. The model boundary conditions were then determined by a direct comparison with experimental strain and displacement data from clamped end specimens. Both the elastic (compliance and elastic stress intensity) and the plastic response (J-plastic, Eta(pl)) of the clamped end model were determined at ratios of height-to-width of 6, 8 and 10 and crack length to width ratios between 0.1 and 0.6. Strain hardening levels of 5, 10 and 20 were selected to observe the effect of high (n=5) and low (n=20) material was also investigated. Finally, the level of crack tip stress triaxiality in this specimen configuration was determined and compared with standard specimens. Expressions for compliance stress intensity and Eta(pl) are presented in a format that is consistent with ASTM standards for other specimen geometries. Results indicate that increases with strain hardening for a/W <0.40 and with H/W at crack lengths >0.30 and that strain hardening has a larger overall effect on Eta(pl) than H/W. Furthermore, clamped end short crack SE(T)s can provide more crack tip triaxiality than short crack SE(B)s and possibly approximate the constraint and loading condition within a structure of interest.