Damage evolution in plates subjected to fatigue loading

12th International Conference on Damage Assessment of Structures

Toribio, J.^1 ; Matos, J.C.^1 ; González, B.^1

Fracture and Structural Integrity Research Group, University of Salamanca, E.P.S. Zamora, Spain^1

关键词: Damage evolution;    Discretizations;    Elliptical shapes;    Fatigue loadings;    Numerical predictions;    Propagation paths;    Quasi circulars;    Stress intensity factor (SIF);   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/842/1/012072/pdf
DOI  :  10.1088/1742-6596/842/1/012072

来源: IOP

【 摘 要 】

The aim of this paper is the numerical prediction of the cracking path followed by a surface crack front in plates constituted of different materials (determined by the exponent m of the Paris law), subjected to cyclic tension or cyclic bending loading. To this end, a numerical modelling was developed on the basis of the discretization of the crack front (characterized with elliptical shape) and the crack advance at each point perpendicular to such a front, according to a Paris law, using the stress intensity factor (SIF) calculated by Newman and Raju. Results show that the crack leads to a preferential propagation path that corresponds to a very shallow initial crack with a quasi-circular crack front. The increase of the Paris exponent produces a quicker convergence during fatigue crack propagation from the different initial crack shapes.