Fatigue crack propagation in thin structures

被引：0

作者：

Hutar, Pavel ^{[1
]}

Seitl, Stanislav ^{[1
]}

Nahlik, Lubos ^{[1
]}

Knesl, Zdenek ^{[1
]}

机构：

[1] Acad Sci Czech Republic, Inst Phys Mat, Brno 61662, Czech Republic

来源：

ADVANCES IN FRACTURE AND DAMAGE MECHANICS VIII | 2010年 / 417-418卷

关键词：

Fatigue crack; vertex singularity; thin structures; SINGULARITY; SURFACE;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of specimen thickness on fatigue crack behaviour has been investigated. To this aim the fatigue crack propagation rate has been measured on two different types of test specimens with varying thickness. The change of stress singularity exponent for the crack front clue to vicinity of the free surface is considered. To explain the effect of stress singularity changes on obtained experimental results a methodology based on generalized stress intensity factor and strain energy density concept has been used. It is shown that for materials with Poisson's ratio of about 0.3 the free surface effect does not play a decisive role for specimens with a low level of in-plane constraint but can influence fatigue crack propagation rate in the case of geometries with a high level of the constraint.

引用

页码：257 / 260

页数：4

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