Effect of static pre-loading on fracture toughness of Nicalon® fibre glass matrix composite

被引:3
作者
Dlouhy, I
Chlup, Z
Chawla, KK
Kulkarni, R
Koopman, M
Boccaccini, AR
机构
[1] ASCR, Inst Physt Mat, Brno 61662, Czech Republic
[2] Univ Alabama Birmingham, Dept Mat Sci & Engn, Birmingham, AL 35294 USA
[3] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2BP, England
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 367卷 / 1-2期
关键词
Nicalon (R) fibre; glass matrix composite; fracture toughness; chevron-notch; static fatigue;
D O I
10.1016/j.msea.2003.09.058
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Static fatigue of commercially available unidirectional SiC-fibre reinforced glass matrix composite has been followed by measuring the fracture toughness of samples statically pre-loaded at different stresses and times. Pre-load levels were just below the loads corresponding to fracture strength, the (bending) pre-stress being on level 300, 310 and 315 MPa. Three hold times, 25, 50 and 75 h, were applied at each of the stresses. For fracture toughness (K-1c) determination, a chevron-notch (CN) three-point bend test was applied. The method has been found to be useful to accurately detect and quantify very subtle microdamage on fibre/matrix interfaces caused by static pre-stressing. Despite of the high scatter of the measured K-1c values, a decrease in fracture toughness with increasing pre-stress and hold time has been found. A parameter is proposed that may be used to quantify the cumulative and combined effect of pre-stress and hold time on fracture toughness of composites. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:17 / 23
页数:7
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