Fracture initiation and size effect in V-notched structures under mixed mode loading
In asserting structural safety it is of paramount importance to be able to evaluate the loading capacity of notched components,where stresses concentrate and can trigger cracks leading to a catastrophic failure or to a shortening of the assessed life of the structure.Restricting the analysis to brittle materials,we apply the Finite Fracture Mechanics criterion to address the problem of a V-notched structure subjected to a mixed-mode loading,i.e.we provide a way to determine the direction and the load at which a crack propagates from the notch tip and express the critical conditions in terms of the generalized stress intensity factors plus a suitable definition of the notch mode mixity.Weight functions of the stress intensity factors for V-notch emanated cracks available in the literature allow us to implement the fracture criterion proposed in an almost completely analytical manner: the determination of the critical load and the direction of crack growth is reduced to a minimization-under-constraint problem.We then highlight the size effect for a V-notched structure under mixed-mode loading and the differences between the structural behaviours of cracked and notched geometries.
sharp notches mode mixity size effect finite fracture mechanics
Pietro Cornetti Alberto Sapora Alberto Carpinteri
Department of Structural,Building and Geotechnical Engineering,Politecnico di Torino,Torino,10124,Italy
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）