FAILURE MODE ANALYSIS AND DESIGN PARAMETERS SELECTION OF REPAIRED COMPOSITE LAMINATES

Abstract

Abstract: Zinoviev theory is one of the most popular stiffness degradation when performing progressive damage analysis of laminates, but it introduces many parameters which makes it difficult to understand and to be applied. Whereas, Zinoviev theory can only be used for 2D model. But, after being simplified and improved, Zinoviev theory can be less parameterd and suitable for 3D model. Based on this improved Zinoviev theory, combined with improved three-dimensional Hashin criterion, simulated the adhesive layers with INTER 205 element, progressive damage analysis of repaired composite laminates with a circular hole, which bears tensile load, have been conducted by ANSYS based on three-dimensional finite element. The results of three-dimensional finite element are in good agreement with those of experiments, and hence proved that the simplified and improved Zinoviev theory and the three-dimensional finite element is capable of simulating the progressive damage analysis of repaired composite laminates. The main failure mode of the repaired composite laminates and the impact of patch parameters on the strength of repaired laminates are discussed, and find out the main failure mode is fiber failure around the hole, which accelerates the failure of fiber in laminates. Increasing the size of patch can imporve the strength of repaired composites, and higher strength can be achieved by designing the stiffness of patch as same as laminates. The repair can be most effective when the patch thickness is half of laminates thickness.

Key words: cohesive zone model, numerical analysis, the progressive damage analysis (PDA), zinoviev theory, stiffness degradation, ANSYS

CLC Number:

TB332

DENG Zhi-kang, CHANG Lei, ZHU Qi-feng, ZHOU Zheng-gen. FAILURE MODE ANALYSIS AND DESIGN PARAMETERS SELECTION OF REPAIRED COMPOSITE LAMINATES[J]. Fiber Reinforced Plastics/Composites, 2018, 0(1): 29-37.

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