FATIGUE CRACK GROWTH MECHANISMS OF LONG AND SMALL CRACKS IN STRUCTURAL MATERIALS

被引：0
|
作者：
Gavras, Anastasios G. [1 ]
Lammi, Christopher J. [1 ]
Lados, Diana A. [1 ]
机构：
[1] Worcester Polytech Inst, Worcester, MA 01609 USA
来源：
TMS 2010 139TH ANNUAL MEETING & EXHIBITION - SUPPLEMENTAL PROCEEDINGS, VOL 3: GENERAL PAPER SELECTIONS | 2010年
关键词：
Fatigue; Microstructure; Stresses; MG CAST ALLOYS; RESIDUAL-STRESS; TITANIUM-ALLOY; MICROSTRUCTURE; BEHAVIOR; TI-6AL-4V; CLOSURE; RATIO;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Fatigue crack growth mechanisms of long and small cracks were investigated in cast and wrought aluminum and titanium alloys with various microstructures (as-cast A535, 6061-T61, mill-annealed Ti-6Al-4V). The effects of microstructure and bulk residual stresses on the fatigue crack growth response of each material were evaluated. Bulk residual stresses were introduced in the testing specimens through quenching. Long crack growth data was generated on compact tension specimens and small crack growth testing was performed on surface flaw tension specimens at low stress ratio, R=0.1. Fatigue crack growth mechanisms with and without crack closure as well as low and high residual stress levels were identified. Corrective techniques compensating for residual stresses and closure on fatigue crack growth data will be presented and discussed.
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收藏
页码：317 / 326
页数：10
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