ROUGHNESS-INDUCED FATIGUE CRACK CLOSURE: A NUMERICAL STUDY
作者： J. LLorca
DOI: 10.1111/J.1460-2695.1992.TB01304.X
关键词: Finite element method 、 Crack growth resistance curve 、 Crack tip opening displacement 、 Surface roughness 、 Stress concentration 、 Mechanics 、 Surface finish 、 Fracture mechanics 、 Materials science 、 Structural engineering 、 Crack closure 、 Mechanical engineering 、 General Materials Science 、 Mechanics of Materials
摘要: — A numerical study of the influence crack surface roughness on fatigue closure is presented. Calculations are performed with a research oriented finite difference code suitably modified to propagation and closure. powerful algorithm contact detection used ascertain interaction between surfaces penalty forces method employed avoid node-to-node node-to-face penetration. The results indicate that key controlling factor roughness-induced tilt angle branches average direction propagation. Crack opening loads increase angle, when plasticity effects negligible, they not affected by branch length. Numerical also able explain large levels measured experimentally in 2124 Al alloy cracks.
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