DAMAGE AND FRACTURE OF A CROSS WOVEN C SIC COMPOSITE SUBJECT TO COMPRESSION LOADING/

Authors
Citation
Md. Wang et C. Laird, DAMAGE AND FRACTURE OF A CROSS WOVEN C SIC COMPOSITE SUBJECT TO COMPRESSION LOADING/, Journal of Materials Science, 31(8), 1996, pp. 2065-2069
Citations number
8
Categorie Soggetti
Material Science
ISSN journal
00222461
Volume
31
Issue
8
Year of publication
1996
Pages
2065 - 2069
Database
ISI
SICI code
0022-2461(1996)31:8<2065:DAFOAC>2.0.ZU;2-B
Abstract
In order to understand the mechanical behaviours of ceramic matrix com posites under various loading conditions, the compression stress-strai n behaviour of a cross woven C/SiC ceramic matrix composite was charac terized in terms of damage and fracture mechanisms, which were observe d by scanning electron microscope (SEM) on a side-polished sample. The compression stress-strain curve was found to consist of two stages. T he first stage, which extends to about 300 MPa, covers linear elastic deformation with a compression modulus of 140 GPa. The second stage st arts with the occurrence of compression damage modes, which include pl y delamination, bundle separation and transverse bundle cracking. Depe nding on the local structure of the sample, the second stage of the st ress-strain curve can be either mostly linear or non-linear. The fract ure of the composite under compression is by kinking, shearing and ben ding fracture of fibre bundles individually or in groups, forming a ma croscopic shear band in the sample.