The Study On T300 Carbon Fiber Composite Material Damage Acoustic Emission Characteristics

Carbon fiber composite material is now being widely used in cutting-edge areas of major fields such as aerospace, defense, construction and sporting goods, solar energy and other civilian industries. It is precisely because of its advantages of high strength, thermal shock resistance and the small proportion it had that made it had the overwhelming attention and rapid development. But because of the different way of the carbon fiber composite paved as well as the composition between matrix and fibers, it is inevitable there will be some parameters control failures in manufacturing process, improper operation and other man-made phenomena. Therefore, the defect detection of carbon fiber composite material and the study of the performance of different paved ways play an important role that it can be better applicated in practical engineering.The different paved way of carbon fiber T300 composites made the damage types produced in the process of the tensile different. In this paper, ABAQUS finite element software is used to simulate the tensile fracture process of two paved ways of the carbon fiber composite laminated plates([-45°/45°]14 and [0°/90°]14).To comparatively analysis of two specimens during stretching stress, strain and failure modes, we can get the effects on the material properties made by the paved ways,and the numerical relationship between stress and strain, damage characteristics. It can provide the theory basis for the experiments and mechanical properties of carbon fiber T300 composites.Through the tensile tests in two paved ways of carbon fiber composite material laminated plates([-45°/45°]14 and [0°/90°]14),we can get a preliminary understanding of the process of tensile fracture of visual damage. Through collecting acoustic emission signals during the stretching process and then analysing those signals by parameter analysis, we can get different characteristics of different phase signals. Afterwards,through the acoustic emission signal spectrum analysis, we preliminary determinate how many types of signal sources are there in the fracture process. Finally, K-means clustering method was adopted in the pattern recognition of each stage stretch. Combining signal characteristics with microscopic damage resistance of carbon fiber composites, we can judge damages belong to acoustic emission signals at all stages which was caused by different paved ways. Eventually, pattern recognition to the tensile failure process of two paved ways of the carbon fiber composite laminated plates([-45°/45°]14 and [0°/90°]14) come true. And it provides experimental evidence for the evaluation of these two types of carbon fiber composite laminates.