The effective stress values have been defined, in order to find a measurement of the stress field directly related to the initiation of a failure mechanism, usually a fracture or fatigue crack initiation. This paper investigates several definitions of effective stress values and applies them to different stress parameters, as well as stress invariant or strain energy density components. In particular, this work examines the effective values not only at the tip of a stress raiser, but also in the surrounding material. The final aim is to understand the relationship between the actual distribution of effective values and the real failure initiation point, i.e. to verify if the location of maximum values of effective stress parameters is actually the position of the failure initiation
Effective stress parameters close to stress singularities
LIVIERI, Paolo;TOVO, Roberto
2011
Abstract
The effective stress values have been defined, in order to find a measurement of the stress field directly related to the initiation of a failure mechanism, usually a fracture or fatigue crack initiation. This paper investigates several definitions of effective stress values and applies them to different stress parameters, as well as stress invariant or strain energy density components. In particular, this work examines the effective values not only at the tip of a stress raiser, but also in the surrounding material. The final aim is to understand the relationship between the actual distribution of effective values and the real failure initiation point, i.e. to verify if the location of maximum values of effective stress parameters is actually the position of the failure initiationI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
