THE EFFECT OF STRESS RATIO ON THE NEAR-THRESHOLD FATIGUE CRACK-GROWTH BEHAVIOR OF TI-8AL-1MO-1V AT ELEVATED-TEMPERATURE

被引：23

作者：

SALIVAR, GC ^{[1
]}

HEINE, JE ^{[1
]}

HAAKE, FK ^{[1
]}

机构：

[1] PRATT & WHITNEY AIRCRAFT CO,DIV GOVT PROD,W PALM BEACH,FL 33402

来源：

ENGINEERING FRACTURE MECHANICS | 1989年 / 32卷 / 05期

关键词：

Computer Aided Analysis - Fatigue of Materials--Crack Propagation - Metals Testing--Tensile Tests - Stresses;

D O I：

10.1016/0013-7944(89)90177-X

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

An investigation of the effects of stress ratio and temperature on the near-threshold fatigue crack growth characteristics of Ti-8Al-1Mo-1V was performed. Computer-controlled decreasing stress intensity range tests using compact tension specimens were conducted for various stress ratios at temperatures of 76°F (24°C) and 500°F (260°C) in laboratory air. Crack opening load was determining throughout the tests based on automated compliance measurements and was used to adjust the fatigue crack growth rate data to effective stress intensity range (ΔKeff). The effects of stress ratio at a constant temperature were able to be explained by the concept of crack closure and ΔKeff. A unique value of fatigue crack growth rate threshold, ΔKth was observed for all of the test conditions when crack closure was accounted for in the data analysis.

引用

页码：807 / 817

页数：11

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