| In this paper, the residual strength of damaged composite laminates and their repaired structures under unidirectional tensile stress is calculated. The influence of the repair parameters, such as the diameter of the circle patch, the length and the width of the rectangle patch, the thickness of the patch, the stacking sequence is discussed. The work includes four parts as following.A two-dimensional finite element model is constructed and the analysis program is complied to analyze the residual strength of damaged composite laminates under unidirectional tensile stress.The validity of the finite element model and analysis program is validated by three examples. The results of calculation show that the finite element model and program is more precise and can be used to calculate the residual strength of damaged composite laminates and their repaired structures.The residual strength of damaged composite laminates and their repaired structures are calculated, and the influence of the repair parameters is discussed by the finite element and program stated above. Some useful conclusion can be drawn according to thecurves, which show the influence of repair parameters to repair effect.For the laminate which contains a circle hole, the suggested patch shape is circle, the patch size is 2 to 3 times than the diameter of damaged hole, the patch thickness is equal to the parent laminate and the patch stacking sequence is the same as the parent laminate.For the laminate which contains a crack, the suggested patch shape is rectangle, the patch thickness is equal to the parent laminate and the patch stacking sequence is the same as the parent laminate. Because the length and the width of the patch have the fewer influence on the repair effect, the patch has the least weight on the basis of enough edge distance, end distance and space having been promised.A series of software applicable to engineering is developed by Object-Oriented method. |
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