Elastic and Plastic Analysis of a Single Edge Cracked Tension Specimen with Clamped Ends
NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD SURVIVABILITY STRUCTURES AND MATERIALS DIRECTORATE
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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, Etapl 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 n5 and low n20 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 Etapl are presented in a format that is consistent with ASTM standards for other specimen geometries. Results indicate that increases with strain hardening for aW 0.40 and with HW at crack lengths 0.30 and that strain hardening has a larger overall effect on Etapl than HW. Furthermore, clamped end short crack SETs can provide more crack tip triaxiality than short crack SEBs and possibly approximate the constraint and loading condition within a structure of interest.