Numerical Simulation For Edge Impact Damage Of Composite T-type Stringer With Experimental Verification

Fiber Reinforced Polymer/Plastic have been widely used in aerospace and other advanced structures,but the impact damage of FRP is easy to occur because of its weak impact resistance,which poses a serious threat to the bearing capacity and safety of the structure.Therefore,the impact damage resistance of FRP structure is one of the key problems in FRP structure design.In this paper,the common methods and research status of low-speed impact damage of composite materials are reviewed from both experimental and numerical simulation aspects,and the existing problems of impact damage are briefly described.The existing low-speed impact simulation models are classified and evaluated.The models are divided into two parts: impact process model and material damage evolution model.The key elements of the two parts are dealt with and the common collocation of each element is reviewed.At the same time,three kinds of impact process models and two kinds of material damage evolution models are established by using ABAQUS software.The material damage evolution model is realized by using self-compiled subroutine Vumat.Six impact damage simulation models are composed by combination and collocation.The low-speed impact damage of two different laminates is simulated by using these six models.By comparing the results of impact damage obtained from experiments and simulations,the predictive ability of the six models was evaluated in terms of damage shape and calculation efficiency.The edge drop-weight impact test of Carbon Fiber Composite T-type stringer is carried out,and the damage characteristics of edge impact of two kinds of web thickness are studied.Using the evaluation results in Chapter 2,a suitable simulation model is selected to simulate the T-type stringer with two thicknesses,which verifies the applicability of the selected model to the problem of edge impact.