Isothermal low cycle fatigue of titanium matrix composites

被引：1

作者：

Assler, H ^{[1
]}

Hemptenmacher, J ^{[1
]}

Trautmann, KH ^{[1
]}

机构：

[1] DLR, German Aerosp Ctr, Mat Res Inst, D-51147 Cologne, Germany

来源：

LOW CYCLE FATIGUE AND ELASTO-PLASTIC BEHAVIOUR OF MATERIALS | 1998年

关键词：

titanium matrix composite; IMI834; SiC-fibre; crack initiation; crack propagation;

D O I：

10.1016/B978-008043326-4/50079-9

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Ceramic fibre reinforcement has been suggested as a means to improve the resistance of a titanium alloy to mechanical fatigue. Low cycle fatigue tests at room and elevated (600 degrees C) temperature were conducted on specimens, fabricated by DLR, a part of them heat treated at 700 degrees C/2000h. In comparison with results described in the literature the tested material showed an increase of stress of nearly 30% at the same fatigue life. An investigation of metallographically polished specimens gave a first insight in the damage mechanisms. Defects at the surface of the specimens and the brittle reaction zone at the fibre/matrix interface acted as points of crack initiation. The crack propagation mainly depended on fibre bridging mechanisms, stress level in the matrix, microstructure of the matrix and properties of the fibre/matrix interface.

引用

页码：461 / 466

页数：4