TY - JOUR
T1 - High temperature fiber pushout of pristine and transversely fatigued SiC/Ti-6-4
AU - Bechel, V. T.
AU - Sottos, N. R.
N1 - Funding Information:
The authors would like to acknowledge the financial support of the ONR (under contract monitor R. Barsoum) and the AFOSR (Senior Knight Program). Also, we would like to acknowledge Dr. J. I. Eldridge from NASA Lewis for several helpful discussions about the design of the high temperature experiment.
PY - 1999
Y1 - 1999
N2 - An experiment was designed and constructed to perform fiber pushout tests at elevated temperatures in a controlled environment. Preliminary pushout tests on both a pristine and a transversely fatigued SiC/Ti-6-4 composite were conducted in atmospheric conditions to assess the capabilities of this apparatus and to study the interfacial behavior of SiC/Ti-6-4 at elevated temperature. At room temperature, the force-displacement behavior for the two types of samples was similar. The frictional portion of the load-displacement curve following total debond indicated that the interface could carry a greater load due to increasing friction and interlocking of the fiber and matrix surfaces. At 400°C, significant changes in the load-displacement pushout curves were observed. At this elevated temperature, the interfacial friction produced by radial clamping was significantly reduced due to the relaxation of residual stresses, and significantly lower forces were required for pushout. The peak load for pushout of the fatigued samples at 400°C was almost negligible, indicating that the fiber-matrix bond was broken by the fatigue loading. Due to varying compliance in the test fixture, it was not possible to identify progressive debonding.
AB - An experiment was designed and constructed to perform fiber pushout tests at elevated temperatures in a controlled environment. Preliminary pushout tests on both a pristine and a transversely fatigued SiC/Ti-6-4 composite were conducted in atmospheric conditions to assess the capabilities of this apparatus and to study the interfacial behavior of SiC/Ti-6-4 at elevated temperature. At room temperature, the force-displacement behavior for the two types of samples was similar. The frictional portion of the load-displacement curve following total debond indicated that the interface could carry a greater load due to increasing friction and interlocking of the fiber and matrix surfaces. At 400°C, significant changes in the load-displacement pushout curves were observed. At this elevated temperature, the interfacial friction produced by radial clamping was significantly reduced due to the relaxation of residual stresses, and significantly lower forces were required for pushout. The peak load for pushout of the fatigued samples at 400°C was almost negligible, indicating that the fiber-matrix bond was broken by the fatigue loading. Due to varying compliance in the test fixture, it was not possible to identify progressive debonding.
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U2 - 10.1023/A:1004657804853
DO - 10.1023/A:1004657804853
M3 - Article
AN - SCOPUS:0032665110
SN - 0022-2461
VL - 34
SP - 3471
EP - 3478
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 14
ER -