Random fatigue damage accumulation analysis of composite thin-wall structures based on residual stiffness method. (1st March 2019)

• Record Type: Journal Article
• Authors: Wu, Zengwen; Fang, Guodong; Fu, Maoqing; Chen, Xiaojie; Liang, Jun; Lv, Dongkai
• Is Part Of: Composite structures. Volume 211(2019)
• Page Start: 546
• Page End: 556
• Publication Date: 2019-03-01
• Subjects: Composites materials -- Random fatigue -- Random vibration -- Residual stiffness -- Fatigue life; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2019.01.018
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: The damage accumulation and life prediction for C/SiC composite panels subjected to random vibration loading was studied by using the residual stiffness model in combination with critical failure stiffness ratios in the different stress levels. According to the results of stiffness degradation and material S-N curves for constant-amplitude fatigue loadings, a new residual stiffness model was established and extended to adapt random stress states by using an equivalent damage ratio algorithm in time domain. The stiffness degradation and material S-N curves were obtained by using constant amplitude fatigue experiments. Random vibration tests with limited-bandwidth excitation were conducted to verify the prediction model. Good agreement is observed compared with the results of 2D plain-woven C/SiC composite panel subjected to random vibration loadings.