FATIGUE-CRACK GROWTH AND CLOSURE BEHAVIOR OF SEMICIRCULAR AND SEMIELLIPTIC SURFACE FLAWS

被引：55

作者：

CHERMAHINI, RG

PALMBERG, B

BLOM, AF

机构：

[1] Aeronautical Research Institute of Sweden (FFA), Structures Department, S-161 11 Bromma

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 1993年 / 15卷 / 04期

关键词：

CRACK CLOSURE; SURFACE FLAWS; 3D ELASTIC PLASTIC FEM; AIRCRAFT SPECTRUM LOADING; ALUMINUM ALLOY;

D O I：

10.1016/0142-1123(93)90374-Y

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The growth behaviour of semi-elliptical and semicircular cracks subjected to crack extensions due to tensile constant amplitude loading (R = 0.1) was investigated using a three-dimensional elastic-plastic finite-element analysis of fatigue crack growth and closure. Based on this analysis, for both semicircular and semi-elliptical meshes, the crack first closed on the exterior (free) surface (theta = 0-degrees) and then closed towards the interior region upon further unloading of the cyclic loading. The closure and opening behaviour of crack surfaces for both semicircular and semi-elliptical geometries are investigated. An experimental investigation of semi-elliptical flaws under fin spectrum loading was conducted to simulate realistic growth rate behaviour for the semi-elliptical geometry.

引用

页码：259 / 263

页数：5

共 8 条

[1] VARIATION OF CRACK-OPENING STRESSES IN 3-DIMENSIONS - FINITE THICKNESS PLATE [J].