Unified model of nucleation and growth of fatigue cracks. Part 1. Use of force parameters of fracture mechanics of materials in the stage of crack nucleation

1998 ◽  
Vol 34 (1) ◽  
pp. 1-18
Author(s):  
O. P. Ostash ◽  
V. V. Panasyuk ◽  
E. M. Kostyk
Keyword(s):  
Fracture Mechanics ◽  
Crack Nucleation ◽  
Fatigue Cracks ◽  
Use Of Force ◽  
Nucleation And Growth ◽  
Unified Model ◽  
Mechanics Of Materials

Analysis of Fretting Crack Propagation Behavior with X-FEM Method

2012 ◽  
Vol 157-158 ◽  
pp. 1162-1166
Author(s):  
Wen Li ◽  
Ri Dong Liao ◽  
Li Tao Liu ◽  
Zheng Xing Zuo
Keyword(s):  
Fracture Mechanics ◽  
Crack Propagation ◽  
Crack Nucleation ◽  
Contact Region ◽  
Fatigue Cracks ◽  
Fretting Fatigue ◽  
Extended Finite Element ◽  
Propagation Behavior ◽  
Fem Method ◽  
Bulk Stress

Fretting fatigue cracks always initial at the tralling of contact region, because the stresses in the vicinity of the contact zone exhibit steep gradients. A fracture mechanics approach is usually used to estimate fretting fatigue propagation life. In this paper, extended finite element method combined with fracture mechanics is used to study fretting crack propagation behaviors. The computation results reveal that fretting crack nucleation is mainly decided by fretting, and the cycle bulk stress is the main reason for crack propagation. Also the X-FEM exhibits merits in fretting fatigue problem.

Nonlinear Fracture Mechanics Analysis Considering Material Inhomogeneity of Welded Joints

Impact ◽  
2019 ◽  
Vol 2019 (10) ◽  
pp. 105-107
Author(s):  
Hiroshi Okada
Keyword(s):  
Fracture Mechanics ◽  
Solid Mechanics ◽  
Crack Nucleation ◽  
Intensity Factors ◽  
Nonlinear Fracture Mechanics ◽  
Material Inhomogeneity ◽  
Computational Fracture Mechanics ◽  
New Methods ◽  
Nonlinear Fracture ◽  
Mechanics Analysis

Professor Hiroshi Okada and his team from the Department of Mechanical Engineering, Faculty of Science and Technology, Tokyo University of Science, Japan, are engaged in the field of computational fracture mechanics. This is an area of computational engineering that refers to the creation of numerical methods to approximate the crack evolutions predicted by new classes of fracture mechanics models. For many years, it has been used to determine stress intensity factors and, more recently, has expanded into the simulation of crack nucleation and propagation. In their work, the researchers are proposing new methods for fracture mechanics analysis and solid mechanics analysis.

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