Computational modelling of postbuckling behavior of composite T-stiffened panels with different bonding methods. (1st June 2019)

• Record Type: Journal Article
• Authors: Ye, Yaoyao; Zhu, Weidong; Jiang, Junxia; Xu, Qiang; Ke, Yinglin
• Is Part Of: Composites. Number 166(2019)
• Page Start: 247
• Page End: 256
• Publication Date: 2019-06-01
• Subjects: Buckling -- Debonding -- Damage mechanics -- Finite element analysis (FEA); Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2018.11.137
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: This study concerns a computational model for the postbuckling failure mechanism of composite T-stiffened panels with different bonding methods. The model is then validated against the available experiments and excellent agreement is obtained. Further, the model is used to predict the postbuckling behavior of the stiffeners co-cured, co-bonded, and secondary bonded to the skin, where the new separation phenomenon including margin cohesive failure, local debonding, and global debonding are captured. Moreover, a parametric study is also carried out to investigate the effect of skin-stiffener interface energy and strength on the postbuckling response of composite panels. The numerical results show that the bonding method has little effect on the uniaxial compressive stiffness of the composite T-stiffened panel, but influences the collapse load and failure process by affecting the skin-stiffener interface behavior. Besides, the collapse load and the failure mode are influenced by the ratio of the interface strength to the interlaminar shear strength. The fiber failure location and shape of load-shortening curve are affected by the ratio of the interface energy to the interlaminar fracture energy.