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Abstract
Most analytical and experimental studies in fracture mechanics are devoted to the development of methods for material crack resistance determination in the case of mode I cracking. For mode 111 cracking there are no practical investigations. In this paper an initial investigation of bending stress (or strain) components ahead of the crack have been performed in thin-walled specimens and full-scale structural elements using holographic interferometry and strain gauging. It is shown that in many cases the values of bending stresses exceed conforming values of net stresses in structural elements.