info:eu-repo/semantics/article
Analysis of the stress intensity factor dependence with the crack velocity using a lattice model
Fecha
2019-01Registro en:
Braun, Matias Nicolas; González Albuixech, Vicente Francisco; Analysis of the stress intensity factor dependence with the crack velocity using a lattice model; Wiley Blackwell Publishing, Inc; Fatigue; 42; 5; 1-2019; 1075-1084
8756-758X
CONICET Digital
CONICET
Autor
Braun, Matias Nicolas
González Albuixech, Vicente Francisco
Resumen
In this work, the influence of crack propagation velocity in the stress intensity factor has been studied. The analysis is performed with a lattice method and a linear elastic constitutive model. Numerous researchers determined the relationship between the dynamic stress intensity factor and crack propagation velocity with experimental and analytical results. They showed that toughness increases asymptotically when the crack tip velocity is near to a critical. However, these methods are very complex and computationally expensive; furthermore, the model requires the use of several parameters that are not easily obtained. Moreover, its practical implementation is not always feasible. Hence, it is usually omitted. This paper aims to capture the physics of this complex problem with a simple fracture criterion. The selected criterion is based on the maximum principal strain implemented in a lattice model. The method used to calculate the stress intensity factor is validated with other numerical methods. The selected example is a finite 2D notched under mode I fracture and different loads rates. Results show that the proposed model captures the asymptotic behaviour of the SIF in function of crack speed, as reported in the aforementioned models.