Effect of compressive loads on plasticity induced crack closure

被引：19
作者：
Antunes, F. V. [1 ]
Correia, L. [2 ]
Camas, D. [3 ]
Branco, R. [4 ]
机构：
[1] Univ Coimbra, Dept Mech Engn, CEMUC, P-3030788 Coimbra, Portugal
[2] Inst Politecn Castelo Branco, Escola Super Tecnol, CEMUC, P-6000767 Castelo Branco, Portugal
[3] Univ Malaga, Escuela Ingn, Dept Civil Engn Mat & Fabricat, E-29071 Malaga, Spain
[4] Polytech Inst Coimbra, Dept Mech Engn, ISEC, P-3030129 Coimbra, Portugal
来源：
THEORETICAL AND APPLIED FRACTURE MECHANICS | 2015年 / 80卷
关键词：
Fatigue crack growth; Plasticity induced crack closure; Compressive stresses; Negative stress ratio; FINITE-ELEMENT-ANALYSIS; DRIVING-FORCE PARAMETER; NEGATIVE STRESS RATIOS; NUMERICAL-SIMULATION; PROPAGATION RATE; MESH REFINEMENT; TIP PARAMETERS; FATIGUE; GROWTH; MODEL;
D O I：
10.1016/j.tafmec.2015.09.001
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Compressive stresses play an important role on tension-compression fatigue which can be attributed to plasticity induced crack closure (PICC). The objective here is to study numerically the effect of compressive stresses on PICC and to discuss the applicability of PICC to explain the effect of negative stress ratios on fatigue crack growth rate. The compression produces reversed plastic deformation at the crack tip, reducing linearly the crack opening level. The incursion to negative stress ratios did not produce sudden changes in the behavior of PICC and no saturation with the decrease of minimum load was observed for Delta K-eff. Crack closure was able to collapse da/dN-Delta K curves with negative stress ratios, indicating the applicability of the crack closure concept to explain the effect of negative R. The analysis of crack tip plastic strain range with and without contact of crack flanks confirmed the validity of crack closure concept. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：193 / 204
页数：12
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