Time‐Dependent Deformation Analysis of Thin‐Shell Composite Materials Under Accelerated Aging Using Arrhenius and
SFM
Methods
Yangqing Huang, Shuo Zhao, Chen Yang, He Xiang, Yu Wang, Zhaoyong Dong, Guanzhen Dong, Yiyong Yang, Yaming Jiang ABSTRACT
To address the challenges of deformation and the difficulty in quantifying deformation in three‐dimensional thin‐shell composite materials made from multilayer‐connected biaxial weft‐knitted (MBWK) fabric, this study proposes a method for quantifying deformation in hemispherical thin‐shell structures using accelerated aging experiments and optical measurement techniques. The research analyzes component deformation caused by residual stresses due to bending and shear sliding of backing yarns during the formation of three‐dimensional curved surfaces. Based on the Arrhenius aging model, accelerated aging experiments were conducted on the thin‐shell composites, and deformation characteristics were quantified using structure‐from‐motion (SFM) photogrammetry and circular deformation measurement techniques. The deformation trends over a three‐year natural aging period were also investigated. A comparison between one‐year natural aging and accelerated aging experiments revealed consistent deformation patterns. Results indicate that about 55% of the total deformation occurs within the first 4 months, followed by a slower deformation phase, entering a relatively stable stage. The primary contribution of this study lies in proposing an effective method for quantifying curved surface deformation of hemispherical thin‐shell composites, providing insights into addressing the challenge of quantifying complex curved surface deformation and laying the foundation for optimizing manufacturing processes, extending product lifespan, and enhancing performance stability.