Study On The Interfacial Cracking And Damage Of The Carbon Fiber Reinforced Composite Material

Carbon fiber reinforced composite material has been widely used in different areas of industries and daily life, for its excellent mechanical properties comparing with the traditional metal materials. The advances in technology and improving demand for better properties are promoting the development of the composite. It is always the key and difficult point in composite science that the study on interfacial mechanical behavior. This paper is based on the numerical simulation, firstly try to analyze the transverse cracking process of the mesoscopic interface, and then the interface damage expanding of the laminate caused by the free edge effect,?Finally the tensile test is involved to study the strength failure of the laminate. The main contents are as follows:1. The transverse mesoscopic failure process of the carbon fiber reinforced composite is modeled with the two methods, progressive damage and cracking, and their results are compared. In the cracking method, the XFEM and surface-based cohesive behavior technology provided by ABAQUS are combined, to simulate the interface and matrix cracking. Basing on this cracking method, some factors'impacts on the transverse fracture process are considered, such as the fiber volume fraction, interface strength, interface stiffness, etc.2. The stress distribution and damage process of the laminate interlayer is analyzed with the finite element model under uniaxial tensile load, and the damage mechanism of the interlayer is studied. Some factors'impacts on the interlayer stress distribution are considered specifically, such as the interlayer thickness, angle of each layer and the existence of the round hole. As for the measure to restrain the free edge effect of the laminate, it is detailedly researched that the effect mechanism of cutting a series of notches along the free edge.3. The uniaxial tensile test of the carbon fiber composite laminate is carried out. It is compared and analyzed that the different fracture patterns of the longitudinal and transverse specimens, also the tensile strength, displacement and other mechanical parameters are measured. Additionally with the help of the ABAQUS subroutine interface, taking the TSAI-WU theory as the failure criterion, the specimens'damage processes are simulated. Then the numerical results are compared with the test results.