✍ Scribed by Q. Vosikovský
No coin nor oath required. For personal study only.
Displacement and strains in the plastically yielded region generated ahead of a crack were measured with replica technique. The shape and length of the yielded zone were detected on mild steel plates of various thicknesses.
The results of plastic zone length and displacement measurements were compared with theoretical solutions of both DBCS model and infinite series of identical coplanar cracks. The measured values of these quantities are, below the general yield, lower than theoretically predicted, and decrease with increasing plate thickness. From this there follows that the plastic zone length and crack tip displacement depends on the degree of stress triaxiality and the theoretical solutions for plane stress or anti-plane strain cannot be used for situations approaching plane strain.
The comparison of these results with fracture stress vs. temperature curves suggests that critical value of crack tip displacement as fracture criterion can be used only for bodies fractured after general yield.
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