TY - JOUR
T1 - Dynamic fracture toughness of cellular materials with different microstructures
AU - Wang, Zhuangzhuang
AU - Cao, Xiaofei
AU - Zeng, Qinglei
AU - Wang, Jizhen
AU - Li, Ying
N1 - Publisher Copyright:
© 2023
PY - 2023/4/28
Y1 - 2023/4/28
N2 - Ultra-lightweight cellular materials have been widely utilized owing to their excellent specific stiffness, strength and fracture resistance ability. However, current understanding of the fracture resistance of cellular materials is mostly limited to quasi-static loading conditions, and their resistance to dynamic fracture is comparatively less understood. In this study, we investigate the dynamic fracture behaviors of the triangular, kagome, and hexagonal honeycomb cellular materials using numerical methods. Both single-edge notched bend and single-edge notched tension specimens under dynamic loading are considered, and the J values of dynamic fracture toughness of the three configurations are determined. Simulation results demonstrate that the fracture resistance of the triangular honeycomb increases with increasing loading velocity, whereas the fracture toughness of the two other structures exhibits slight variation with respect to the loading rates. After examining the fracture response by changing the strain-rate-dependence of the constituent material, we concluded that the microstructure has a more significant effect on the rate-dependence of fracture toughness than the constituent material. A mechanism based on crack deviation is proposed to account for the distinct rate-dependence of fracture toughness in specimens with different microstructures.
AB - Ultra-lightweight cellular materials have been widely utilized owing to their excellent specific stiffness, strength and fracture resistance ability. However, current understanding of the fracture resistance of cellular materials is mostly limited to quasi-static loading conditions, and their resistance to dynamic fracture is comparatively less understood. In this study, we investigate the dynamic fracture behaviors of the triangular, kagome, and hexagonal honeycomb cellular materials using numerical methods. Both single-edge notched bend and single-edge notched tension specimens under dynamic loading are considered, and the J values of dynamic fracture toughness of the three configurations are determined. Simulation results demonstrate that the fracture resistance of the triangular honeycomb increases with increasing loading velocity, whereas the fracture toughness of the two other structures exhibits slight variation with respect to the loading rates. After examining the fracture response by changing the strain-rate-dependence of the constituent material, we concluded that the microstructure has a more significant effect on the rate-dependence of fracture toughness than the constituent material. A mechanism based on crack deviation is proposed to account for the distinct rate-dependence of fracture toughness in specimens with different microstructures.
KW - Cellular materials
KW - Crack propagation
KW - Dynamic fracture toughness
KW - Rate-dependent fracture
UR - http://www.scopus.com/inward/record.url?scp=85151781637&partnerID=8YFLogxK
U2 - 10.1016/j.engfracmech.2023.109221
DO - 10.1016/j.engfracmech.2023.109221
M3 - Article
AN - SCOPUS:85151781637
SN - 0013-7944
VL - 283
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
M1 - 109221
ER -