ICSID 2019

Dubrovnik, Croatia, June 4 – 7, 2019

The Effect of Crack-tip Constraint in Fracture Mechanics

Yu. G. Matvienko, Mechanical Engineering Research Institute of the Russian Academy of Sciences

The effect of in-plane and out-of-plane crack-tip constraint parameters, namely, the non-singular T-stress components and the parameter A, in some problems of elastic and elastic-plastic fracture mechanics is discussed. The three-dimensional crack tip stresses including the non-singular T-stress components are employed to describe the crack tip plastic zone, failure assessment diagrams and the constraint-dependent fracture toughness for a solid with a finite notch/crack under mode I loading, the angle of surface crack growth under conditions of rolling-sliding. Theoretical and numerical aspects of the two-parameter J-A approach in elastic-plastic fracture mechanics are presented in connection with crack-tip constraint. It is shown that the parameter A can be introduced in fracture criterion as a constraint parameter.