A study of tensile residual strength of composite laminates under different patch-repaired series

2017 3rd International Conference on Applied Materials and Manufacturing Technology

Ding, M.H.^1,2,3 ; Zhan, S.^3 ; Tang, Y.H.^3 ; Wang, L.^3 ; Ma, D.Q.^1 ; Wang, R.G.^2

Hafei Aviation Industry Company Limited, Harbin

150027, China^1

Harbin Institute of Technology, Harbin

150001, China^2

College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin

150001, China^3

关键词: Composite laminate;    Failure mechanism;    FEM simulations;    High stress concentration;    Laminate structures;    Strength prediction;    Tensile behaviors;    Tensile residuals;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/242/1/012018/pdf
DOI  :  10.1088/1757-899X/242/1/012018

来源: IOP

【 摘 要 】

The tensile behavior of composite laminate structures repaired by bonding external patches was studied in the paper. Two different types of patches including wedge patches and inverted wedge patches were used and failure mechanisms, failure load and strength predictions were studied. A convenient and fast method of building 2-D finite element modeling (FEM) of laminate structure repaired was proposed and the strength of repaired laminate structures was calculated by FEM. The results showed that more than 80% tensile strength of the undamaged laminate could be recovered by bonding patch repairs. Moreover, the results indicated that the strength of inverted wedge patches repair were higher than that of wedge patches repair. FEM simulation results indicated that high stress concentration was found along the edges of invert patches and the most weakness part located in the adhesive bondline. FEM analysis results showed that the strength predicted matched well with the test strength.