Smart structures based on shape memory polymer composites (SMPCs) are gradually applied to the aerospace field hosting an ideal combination of properties. The damage behavior of SMPC-based smart structures with large deformations requires mechanism research to satisfy their reliability. In this study, a programmable SMPC-based locking laminate was investigated, which is expected to replace initiating explosives. Firstly, based on fiber buckling theory, fiber-reinforced SMPC locking laminate was designed and analyzed, and the safe allowable area and damage modes were determined. Additionally, the deformation test of the locking laminate based on fiber fabric reinforced SMPC showed that there is two typical damage behavior: matrix cracking and interlayer delamination. For this reason, theoretical analysis was performed to reveal the damage mechanism and initial damage location. The results indicated that the fiber bundle width, arc radius, and thickness were the influencing factors of matrix cracking, while the center angle was the influencing factor of delamination. Finally, finite element analysis shows the validity of the theoretical analysis. This research has potent inspiration and reference significance for the design of SMPC-based smart structures.

COMPOSITES PART B-ENGINEERING  Volume 259, 15 June 2023, 110755

Liu, Zhengxian; Mu, Tong; Lan, Xin; Zhao, Hanxing; Liu, Liwu; Bian, Wenfeng; Liu, Yanju; Leng, Jinsong

https://doi.org/10.1016/j.compositesb.2023.110755

Structural and damage analysis of a programmable shape memory locking laminate with large deformation.pdf