The direct measurement of J integral was applied originally to the edge cracked tensile panel, whereas later its application has been extended to surface cracked tensile and bending panels, and pressure vessels. Special attention has been paid to the weldments, because of their heterogeneity and significant influence of residual stresses and geometry imperfections. The influence of residual stresses and geometry imperfection was investigated on wide panels and pressure vessels in a stress relieved or as-welded state, with concave or convex angular distortion, with different matching of weld and base metal and with different crack position and magnitude. In this paper the experience gathered so-far and prospective of J integral direct measurement is analysed and presented.
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