BEHAVIOUR OF SHORT CRACKS EMANATING FROM TINY DRILLED HOLES

被引：0

作者：

Gliha, Vladimir ^{[1
]}

Maruschak, Pavlo ^{[2
]}

Vuherer, Tomaz ^{[1
]}

机构：

[1] Univ Maribor, Fac Mech Engn, SLO-2000 Maribor, Slovenia

[2] Ternopil Ivan Puluj Natl Tech Univ, UA-46001 Ternopol, Ukraine

来源：

MATERIALI IN TEHNOLOGIJE | 2013年 / 47卷 / 04期

关键词：

small defect; drilled hole; crack initiation; crack propagation; short crack; long crack; anomalous fast-crack propagation; SHORT FATIGUE CRACKS; INITIATION; DEFECTS;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Specimens with martensitic microstructure were defected by tiny drilled holes with the existing local residual stresses induced by drilling and without them. The objective of this research was to determine the cyclic stress level for the crack initiation and fatigue limit of the defected and smooth specimens' dependence upon the residual-stress field. Compressive residual stresses retarded the crack initiation. Immediately after the crack initiation, residual stresses decelerated the short-crack propagation, but later, when the residual-stress sign was changed, they accelerated it. Non-propagating short-crack size and fatigue limit also depend on the residual-stress field.

引用

页码：441 / 446

页数：6