FCG BEHAVIOR OF ALLOYS UNDER ULTRASONIC FATIGUE LOADING

Ni Jingang

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FCG BEHAVIOR OF ALLOYS UNDER ULTRASONIC FATIGUE LOADING

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- FCG BEHAVIOR OF ALLOYS UNDER ULTRASONIC FATIGUE LOADING
- Vol. 9, Issue 3, (1994)
- 作者机构：
  
  北京航空航天大学
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：1994
- 稿件说明：
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Ni Jingang. FCG BEHAVIOR OF ALLOYS UNDER ULTRASONIC FATIGUE LOADING[J]. 1994, 9(3).
DOI：

Ni Jingang. FCG BEHAVIOR OF ALLOYS UNDER ULTRASONIC FATIGUE LOADING[J]. 1994, 9(3). DOI：

摘要

本文应用超声共振试验技术研究了4种工程常用合金(Astroloy

17-4PH

Ti-6Al-4V

Al-Li8090)在超声振动载荷(f=20kHz

R=-1)下的疲劳裂纹扩展性能

并与常规疲劳载荷(f≤50Hz

R=0.7)下材料的有关性能做了对比分析。对超声疲劳载荷下材料损伤及裂纹扩展机理的特点做了研究

给出了这种特定载荷形式下应力强度因子的计算方法。研究结果表明

超声疲劳载荷下各种合金的裂纹扩展性能与常规疲劳试验中确定的有效应力强度因子△Keff类同。

Abstract

Fatigue crack growth (FCG) and threshold behavior of four widely used engineering alloys have been investigated at high frequency Z(f =20kHz) by means of an ultrasonic fatigue device.Specimen design has been given.Crack propagating rate da/dN was obtained between 10-9 and 10-5 mm/cycle in function of stress intensity factor △K

which was determined by a modified analytic experimental method.For comparison

conventional FCG data ( f =2 to 50Hz) were carried out with a high stress ratio (R=0.7) applied.High frequency effect on the fracture behavior of different materials was discussed and the failure mechanism was obtained in the two different regimcs.

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Related Author

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Related Institution

华东船舶工业学院

th Dept.,Beijing University of Aeronautics and Astronautics

th Dept.Beijing University of Aeronautics and Astronautics

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北京航空航天大学

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