Physical Fundamentals of Local Approach to Analysis of Cleavage Fracture

Mechanical Stability — Universal Measure of Resistance to Transition in a Brittle State of Metal

“…), где вероятность разрушения максимальна. Как показано в [5,24] Описание перехода из пластического состояния в хрупкое метал-ла в окрестности надреза или магистральной трещины наглядно иллюстрирует тот факт, что определение условий такого перехода связано с необходимостью выбора допуска на величину локальной пластической деформации. Это во многом напоминает ситуацию, связанную с выбором величины остаточной деформации при опре-делении величины условного предела текучести 0,2  конструкци-онных сталей.…”

A concept of mechanical stability of structural steels

“…Thus, in the first works, the calculations were carried out quite formally by postulating the applicability of the Weibull distribution to the description of brittle fracture [1,2]. Later, the attempts were made to formulate a criterion of initiation of brittle fracture with regard for the actual micromechanisms of fracture of structural steels [3][4][5][6][7][8]. However, the crack resistance (an important characteristic of the material) is a partial case of the response of the loaded material to the presence of a certain defect.…”

Local approach to fracture-based prediction of reactor pressure vessel lifetime

“…M oreover, the attem pts are m ade to use the M aster curve technique [1] to solve this problem . Recently, the local approach to fracture (LAF) has been developed [2], w hich can be used as a pow erful tool for solving this problem [3].The aim o f this study is to present a new version o f the local approach to fracture and to exhibit ability o f its application to predict pressure vessel lifetim e.T heory. In the general case, the statistical criterion o f brittle fracture o f a specim en or a structural elem ent w ith a crack m ay be presented as M…”

“…M oreover, the attem pts are m ade to use the M aster curve technique [1] to solve this problem . Recently, the local approach to fracture (LAF) has been developed [2], w hich can be used as a pow erful tool for solving this problem [3].…”

“…The finite elem ent m ethod (FEM ) enables one to find the value o f K j c w ith a priori given probability o f fracture F 2 . Such approach is realized in physical ( a b in itio ) version o f LAF presented in [3]. The difference is that probability o f fracture of an elem entary volum e, F t , w as determ ined not by the approxim ate form ula (2) but directly by com puter sim ulation o f the crack nuclei (CN) form ation and instability.…”