FATIGUE CRACK CLOSURE MECHANISM IN TITANIUM

被引：175

作者：

WALKER, N

BEEVERS, CJ

机构：

[1] Department of Chemistry, Birmingham University, Birmingham, B15 2TT

来源：

FATIGUE OF ENGINEERING MATERIALS AND STRUCTURES | 1979年 / 1卷 / 01期

关键词：

D O I：

10.1111/j.1460-2695.1979.tb00372.x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Abstract— Fatigue crack closure in commercial titanium has been investigated by examining the crack profile using a two‐stage replica technique and by monitoring the crack raouth opening displacement. The replicas show that when closure occurs the crack does not close back from the crack tip but at discrete contact points along the crack faces. The observed closure mechanism is therefore quite different from the generally accepted model. Assuming that the contact points wedge the crack open, the stress intensity at the minimum load is greater than expected and the range of the stress intensity is effectively reduced. Also, it was found that the crack growth rates measured in the range 0·05 ≦R≦ 0·7 showed a singular dependence on the parameter Δθ which for SEN specimens approximates to the change in angle subtended by the crack faces. It is therefore suggested that there is a direct link between Δθ and the effective stress intensity amplitude. Copyright © 1979, Wiley Blackwell. All rights reserved

引用

页码：135 / &

共 17 条

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