FATIGUE CRACK-PROPAGATION IN THE THRESHOLD REGIME AFTER RAPID LOAD REDUCTION

被引:5
作者
MAYER, HR
STANZL, SE
TSCHEGG, EK
机构
[1] UNIV AGR VIENNA,INST METEOROL & PHYS,A-1180 VIENNA,AUSTRIA
[2] VIENNA TECH UNIV,INST APPL & TECH PHYS,A-1040 VIENNA,AUSTRIA
关键词
D O I
10.1016/0013-7944(91)90168-Z
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
In this work, the influence of rapid load reduction on fatigue crack growth in the threshold regime of the aluminium alloy 2024-T3 has been studied. It can be shown that fatigue crack growth may be severely influenced by crack closure due to oxide formation and fracture surface roughness. After rapid load reduction, crack arrest could be observed at K(max) values 10-100% above the constant amplitude threshold, depending on the environment. With measurements in different environments (humid air and vacuum), the oxide-induced crack closure effect could be recognized as being mainly responsible for an increase of the stress intensity threshold. Using high-frequency fatigue testing equipment, it was possible to show that after rapid load reduction in a vacuum, cracks may begin to grow again after crack arrest of more than 5 x 10(7) cycles.
引用
收藏
页码:1035 / &
相关论文
共 21 条
  • [1] CZEGLEY M, 1989, THESIS TU VIENNA
  • [2] THE EFFECT OF WATER-VAPOR ON FATIGUE CRACK TIP MECHANICS IN 7075-T651 ALUMINUM-ALLOY
    DAVIDSON, DL
    LANKFORD, J
    [J]. FATIGUE OF ENGINEERING MATERIALS AND STRUCTURES, 1983, 6 (03): : 241 - 256
  • [3] Elber W., 1971, SIGNIFICANCE FATIGUE, V486, P230
  • [4] ON CRACK CLOSURE IN THE NEAR-THRESHOLD REGION
    MINAKAWA, K
    MCEVILY, AJ
    [J]. SCRIPTA METALLURGICA, 1981, 15 (06): : 633 - 636
  • [5] A CRITICAL-STUDY OF THE CRACK CLOSURE EFFECT ON NEAR-THRESHOLD FATIGUE CRACK-GROWTH
    MINAKAWA, K
    NEWMAN, JC
    MCEVILY, AJ
    [J]. FATIGUE OF ENGINEERING MATERIALS AND STRUCTURES, 1983, 6 (04): : 359 - 365
  • [6] Ranganathan N., 1987, ASTM INT, P424
  • [7] THE ROLE OF HYDROGEN IN CORROSION FATIGUE OF HIGH-PURITY AL-ZN-MG EXPOSED TO WATER-VAPOR
    RICKER, RE
    DUQUETTE, DJ
    [J]. METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1988, 19 (07): : 1775 - 1783
  • [8] INTERNAL FATIGUE CRACKS ARE GROWING IN VACUUM
    SCHIJVE, J
    [J]. ENGINEERING FRACTURE MECHANICS, 1978, 10 (02) : 359 - 370
  • [9] SCHIJVE J, 1979, ENG FRACT MECH, V11, P167, DOI 10.1016/0013-7944(79)90037-7
  • [10] SCHIJVE J, 1976, ASTM STP, V595