TY - JOUR
T1 - Two failure modes of C/SiC composite under different impact loads
AU - Yang, Yang
AU - Xu, Fei
AU - Gao, Xiangyang
AU - Liu, Gangwei
AU - Zhang, Meng
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/3/1
Y1 - 2018/3/1
N2 - C/SiC composites have wide applications in thermal protective structures of spacecraft, whose impact resistance is essential for safe service. As a continuation of the previous experimental work, two failure modes of C/SiC composites under the impact loads of different shapes of projectiles are investigated through numerical simulations. First, based on the analysis of the damage mechanism, a two-part brittle orthotropic constitutive model is proposed by coupling the orthotropic elastic relationship and the equation of state to describe the dynamic impact response of C/SiC to the spherical projectile. Second, owing to a distinctive equivalent hardening failure mode of C/SiC when impacted by the flat flyer, a modified three-part orthotropic constitutive model is proposed, which introduces an additional pseudoplastic sub-model to describe the yield and post-yield responses. Finally, compared with the experimental results, the rationality and accuracy of these two models and their corresponding parameters are illustrated with respect to damage characteristics, stress-strain curves, the shape of the debris cloud, and free surface velocity, using the commercial software Autodyn.
AB - C/SiC composites have wide applications in thermal protective structures of spacecraft, whose impact resistance is essential for safe service. As a continuation of the previous experimental work, two failure modes of C/SiC composites under the impact loads of different shapes of projectiles are investigated through numerical simulations. First, based on the analysis of the damage mechanism, a two-part brittle orthotropic constitutive model is proposed by coupling the orthotropic elastic relationship and the equation of state to describe the dynamic impact response of C/SiC to the spherical projectile. Second, owing to a distinctive equivalent hardening failure mode of C/SiC when impacted by the flat flyer, a modified three-part orthotropic constitutive model is proposed, which introduces an additional pseudoplastic sub-model to describe the yield and post-yield responses. Finally, compared with the experimental results, the rationality and accuracy of these two models and their corresponding parameters are illustrated with respect to damage characteristics, stress-strain curves, the shape of the debris cloud, and free surface velocity, using the commercial software Autodyn.
KW - C/SiC composites
KW - Damage mechanism
KW - Hardening
KW - Impact resistance
KW - Orthotropic constitutive model
UR - http://www.scopus.com/inward/record.url?scp=85032449609&partnerID=8YFLogxK
U2 - 10.1016/j.compositesb.2017.10.019
DO - 10.1016/j.compositesb.2017.10.019
M3 - 文章
AN - SCOPUS:85032449609
SN - 1359-8368
VL - 136
SP - 158
EP - 167
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
ER -