TY - JOUR
T1 - Flexural fatigue behavior and residual strength evolution of SiCnws-C/C composites
AU - Wang, Le
AU - Fu, Qiangang
AU - Zhou, Huashan
AU - Li, Ni
N1 - Publisher Copyright:
© 2018 Elsevier Ltd and Techna Group S.r.l.
PY - 2018/12/15
Y1 - 2018/12/15
N2 - The flexural fatigue behavior and residual flexural strength evolution of SiC nanowires reinforced carbon/carbon (SiCnws-C/C) composites were investigated. Specimens were loaded at a stress level of 65% of their static flexural strength for 105, 5 × 105 and 10 × 105 cycles, and their residual flexural strength was increased by 4.87%, 13.73% and 62.45% respectively after cyclic loading. Results indicate that the residual strength after cyclic load is affected by the formation and propagation of cracks, interfacial degradation, as well as the relief of residual thermal stress. An appropriate interfacial debonding and releasing of residual thermal stress are responsible for the large improvement of residual strength of SiCnws-C/C composites after 10 × 105 fatigue cycles. Compared with carbon/carbon composites, SiCnws-C/C composites demonstrate higher mechanical strength and stronger resistance to crack propagation, which are ascribed to the strengthening effect brought by the SiC nanowires, including their pull-out, breaking and bridging.
AB - The flexural fatigue behavior and residual flexural strength evolution of SiC nanowires reinforced carbon/carbon (SiCnws-C/C) composites were investigated. Specimens were loaded at a stress level of 65% of their static flexural strength for 105, 5 × 105 and 10 × 105 cycles, and their residual flexural strength was increased by 4.87%, 13.73% and 62.45% respectively after cyclic loading. Results indicate that the residual strength after cyclic load is affected by the formation and propagation of cracks, interfacial degradation, as well as the relief of residual thermal stress. An appropriate interfacial debonding and releasing of residual thermal stress are responsible for the large improvement of residual strength of SiCnws-C/C composites after 10 × 105 fatigue cycles. Compared with carbon/carbon composites, SiCnws-C/C composites demonstrate higher mechanical strength and stronger resistance to crack propagation, which are ascribed to the strengthening effect brought by the SiC nanowires, including their pull-out, breaking and bridging.
KW - Flexural fatigue
KW - Interfacial debonding
KW - Residual flexural strength
KW - SiCnws-C/C
UR - http://www.scopus.com/inward/record.url?scp=85053159856&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2018.09.004
DO - 10.1016/j.ceramint.2018.09.004
M3 - 文章
AN - SCOPUS:85053159856
SN - 0272-8842
VL - 44
SP - 22393
EP - 22400
JO - Ceramics International
JF - Ceramics International
IS - 18
ER -