Finite element modelling and analysis of crack shape evolution in mode-I fatigue Middle Cracked Tension specimens

被引：64

作者：

Branco, R. ^{[1
]}

Antunes, F. V. ^{[2
]}

机构：

[1] Polytech Inst Coimbra, Dept Mech Engn, P-3030129 Coimbra, Portugal

[2] Univ Coimbra, Dept Mech Engn, P-3030201 Coimbra, Portugal

来源：

ENGINEERING FRACTURE MECHANICS | 2008年 / 75卷 / 10期

关键词：

crack shape evolution; MT specimen; tunnelling parameter; stress intensity factor;

D O I：

10.1016/j.engfracmech.2007.12.012

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

A numerical procedure was employed to study the shape evolution of fatigue cracks in Middle Cracked Tension specimens. This iterative procedure consists of a 3D finite element analysis to obtain the displacement field in the cracked body, calculation of stress intensity factors along crack front and definition of local crack advances considering the Paris law. Numerical predictions were compared with experimental crack shapes with a good agreement. The evolution of crack shape was analysed for different propagation conditions considering robust dependent parameters. Two main propagation stages were identified: an initial transient stage highly dependent on initial crack shape and a stable stage where the crack follows preferred paths. Mathematical models were proposed for transient and stable stages consisting of exponential and polynomial functions, respectively. The transition between both stages was defined considering two criteria: the rate of shape variation and the distance to stable shape. Finally, the crack shape change was linked with the distribution of stress intensity factor along crack front. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：3020 / 3037

页数：18

共 28 条

[21] Fatigue growth simulation for cracks in notched and unnotched round bars [J].

Lin, XB ;

Smith, RA .

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 1998, 40 (05) :405-419

[22] Finite element modelling of fatigue crack growth of surface cracked plates - Part I: The numerical technique [J].

Lin, XB ;

Smith, RA .

ENGINEERING FRACTURE MECHANICS, 1999, 63 (05) :503-522

[23] AN EMPIRICAL STRESS-INTENSITY FACTOR EQUATION FOR THE SURFACE CRACK [J].

NEWMAN, JC ;

RAJU, IS .

ENGINEERING FRACTURE MECHANICS, 1981, 15 (1-2) :185-192

[24]

NEWMAN JC, 1984, 6 INT C FRACT NEW DE

[25]

Nykanen TJ, 1996, FATIGUE FRACT ENG M, V19, P99, DOI 10.1111/j.1460-2695.1996.tb00935.x

[26] SOME IMPLICATIONS OF CORNER POINT SINGULARITIES [J].

POOK, LP .

ENGINEERING FRACTURE MECHANICS, 1994, 48 (03) :367-378

[27] Extended finite element method and fast marching method for three-dimensional fatigue crack propagation [J].

Sukumar, N ;

Chopp, DL ;

Moran, B .

ENGINEERING FRACTURE MECHANICS, 2003, 70 (01) :29-48

[28] Significance of dwell cracking for IN718 turbine discs [J].

Wanhill, RJH .

INTERNATIONAL JOURNAL OF FATIGUE, 2002, 24 (05) :545-555

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