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THE RELATIONSHIP BETWEEN QUASI-STATIC AND IMPACT TOUGHNESS

The toughness characteristics of structural materials may present critical property for materials selection, as well as for design or integrity assessment. The scope of this paper are terms for evaluation of fracture mechanics parameters, such as fracture toughness, Kc [MPam 0,5 ], or critical Jintegral, Jc [kJ/m 2 ]. This evaluation may be done on the basis of known and easily determined impact toughness, KV [J]. The main difference between these toughness characteristics, i.e. between KV, and Kc and Jc on other side, is in testing conditions. The testing conditions are determined by existence of initial crack, strain rate, and stress-deformation state. Thus the main difference, quasi-static versus impact, and finally the test price follows. The general relationship terms for structural steels, provided in the actual reference technical literature, shall be presented, as well as the “own” terms based on regression analysis of experimentally determined toughness characteristics..