Analysis Of Low-velocity Impact Response Of Composite Structures

Compostie laminates have been wildly used in the field of aerospace industry and auto industry due to significantly improving the structural performance and structural light weight.However,there are many different levels of impact phenomena in the process of manufacture and utilization,the low-velocity impact damage is difficult to observe.Therefore,it is necessary to investigate the composite laminates under low-velocity impact.With the rapid development of finite element technology,this method is wildly used in analysis of composite structures.This paper investigates the different element types combining with different failure criterion to simulate intra-layer and inter-layer damage in composite structures under low velocity impact by using ABAQUS.The Reddy-type zig-zag model for multilayered composite plates is established for better understanding the theory of composite laminates.Firstly,the analysis of composite laminates is the basic work for composite materials.In this paper,the Reddy-type zig-zag model for multilayered composite plates based on the HW variational theorem is established.Numerical results show that the proposed model can yield accurately the in-plane displacement and stresses of multilayered composite plates,and the accuracy of in-plane displacement and stresses are not affected by the number of layers.In the future investigations,the proposed model combining with the subroutine Uel and Vuel in ABAQUS could solve problems.Secondly,since engineering needs efficient and accurate methods to simulate the low-velocity impact of composite structures,the shell element and continuum shell element are introduced into the FE model to simulate composite component,using failure criteria and damage evolution law to simulate the low-velocity impact of composite structures.The stiffened composite structures are investigated based on above conclusion.The conclusions can be draw in comparison with the experimental results: the continuum shell FE model can be better to simulate the composite laminated structure under low velocity impact;the damage extends along the direction of the ribs.The proposed method is provided for a reference in engineering applications.Finally,establish the 3D FE model of composite laminates under low-velocity impact using ABAQUS and material subroutine Vumat,simulate the response and damage of laminate under low-velocity impact.At the same time,the influence of the impact angle for the laminates is also investigated.To summar up,the simulations verify the accuracy of model and subroutine by comparing with the reference;different impact angle have different influence on composite laminates,the damaged region decreases as the angle of impact increases.