THE INFLUENCE OF LOADING METHODS ON FATIGUE CRACK INITIATION IN POLYCRYSTALLINE COPPER AT AMBIENT-TEMPERATURE

被引：11

作者：

KIM, GH ^{[1
]}

KWON, IB ^{[1
]}

FINE, ME ^{[1
]}

机构：

[1] NORTHWESTERN UNIV,ROBERT R MCCORMICK SCH ENGN & APPL SCI,DEPT MAT SCI & ENGN,EVANSTON,IL 60208

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1991年 / 142卷 / 02期

关键词：

D O I：

10.1016/0921-5093(91)90656-8

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The influence of loading methods such as tension-compression loading and tension-tension loading on fatigue crack initiation has been investigated through microstructural observations in polycrystalline copper at ambient temperature. As expected, transgranular cracking is dominant and the ladder-like dislocation structure evolves from tension-compression loading. Meanwhile intergranular cracking occurs at the interaction site between slip bands and grain boundaries, and quasi-ladder structures are frequently observed as a result of pulsating tension. This unique dislocation morphology seems to result from irreversible slip processes during cyclic loading.

引用

页码：177 / 182

页数：6

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