关键词: 复合材料, 加筋壁板, 装配应力, 缘条分层, 试验, 数值分析

Abstract: Composite laminates are anisotropic and discontinuous along the thickness. Interlaminar stress exists in the composite laminate under out-plane loading. Delamination would happen where the out-plane stress is over interlaminate strength. In order to study the effect of out-of-plane compression load on the failure behavior of stiffened wall structure, corresponding experimental and numerical analyses were performed. Firstly, the failure load and failure mode of the specimens were obtained by the static loading test for the stiffened wall structure. Secondly, the structures were loaded to the working load through the bolts and maintained for a certain period of time. Finally, the finite element method was utilized to analyze the stress distribution of the structures. The results show that co-bonded area debonding and edge strip delamination would occur under the static load, slightly delamination was detected in the lower edge strip of the truss under the working load, and the qualitative agreement between the experimental and the numerical results was reasonably good. The research results provided references for the assembly operation specification and laminate design verification of composite structure.

Key words: composite, stiffened panel, assembly stress, chord delamination, experiment, numerical analysis