Constitutive dependence in finite-element modelling of crack closure during fatigue

被引：14

作者：

Andersson, H

Persson, C

Hansson, T

Melin, S

Järvstråt, N

机构：

[1] MAN B&W Diesel AS, DK-2450 Copenhagen, Denmark

[2] Lund Univ, Div Mat Engn, SE-22100 Lund, Sweden

[3] Volvo Aero Corp, SE-46181 Trollhattan, Sweden

[4] Lund Univ, Div Solid Mech, SE-22100 Lund, Sweden

[5] Univ Trollhatten Uddevalla, SE-46129 Trollhattan, Sweden

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2004年 / 27卷 / 02期

关键词：

Bodner-Partom; crack closure; fatigue; finite-element modelling; IN718; material model;

D O I：

10.1111/j.1460-2695.2004.00724.x

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The influence of choice of constitutive relation on he prediction of crack-opening stress for fatigue cracks using the finite-element method is investigated and compared with experimental results. Two different experimentally obtained stress strain relations for IN718 a 550 degreesC were used for fitting material parameters to the linear kinematic and the Bodner Partom viscoplastic constitutive models. In addition, one reference material description and one Bodner Partom with parameters fitted to both types of experiment was used, i.e., in total six constitutive descriptions. Experimental values for crack-opening stress were found by he potential drop method for the two load cases analyzed. Two different load cases, load control and displacement control, have been examined. It turns out hat the correlation between experimental and analytical crack-opening stress vary significantly with material description, opening criteria in he simulation and load case. The investigation shows that care must be taken when choosing material description and opening criteria for crack propagation simulations.

引用

页码：75 / 87

页数：13

共 25 条

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Allison J.E, 1988, ASTM STP, V945, P913

[2] An implicit formulation of the Bodner-Partom constitutive equations [J].