Acoustic Emission Study On Progressive Failure And Numerical Simulation Research On Delamination Of Carbon Fiber Composite Laminated Plates

Carbon fiber composite which made of carbon fiber reinforcement and resin matrix is a kind of structural material that has been got focus in the new material’s research and development field. It has a series of excellent performance, such as high strength, high modulus, low density, low thermal expansion coefficient and so on, therefore, it has good development prospects. However, because of the varied failure forms and complex failure mechanism of carbon fiber composite, figure out its failure mechanism under different failure modes is a key issue to be solved at present stage. In this paper, combine with test analysis and finite element simulation, we study the damage failure behavior of carbon fiber composite under mode Ⅰ、mode Ⅱ、Ⅰ/Ⅱ mixed mode and tensile load conditions, so as to provide more theoretical basis and analytical methods for its application in aerospace, medical and manufacturing field.The main failure forms of carbon fiber reinforced resin matrix composite include the matrix cracking, the fiber/matrix debonding, the fiber pull-out and the fiber breakage. Load distribution inside carbon fiber composite materials is different during the phase of damage failure, therefore, it is very important for security safety improving of composite materials in the process of using to analyse failure forms and evaluate mechanical properties in each stage of the loading procedure. In this paper, with the help of Scanning Electron Microscope(SEM), Acoustic Emission (AE) Material Testing System (MTS), the change of structural performance and mechanical properties of T700/8911carbon fiber reinforced resin matrix composite material samples in damage failure process has been analysed, the damage evolution law of samples in the process of failure has been discussed, and the influence of stress concentration of carbon fiber reinforced resin matrix composite material to damage and failure has been deeply studied. At last, we put forward a failure history of stress concentration T700/8911Carbon fiber materials under tensile load.Then, on the basis of absorbing theoretical and experiment research experience about interlaminar damage failure mechanism of Carbon fiber composites under load conditions, aiming at Ⅰ/Ⅱ mixed mode interlaminar damage failure process, establish ABAQUS finite element analysis model by Virtual Crack Closure Technique (VCCT), and verify model’s correctness through test, provide experimental and theoretical basis for predicting delamination damage process of T700/8911carbon fiber reinforced resin matrix composite materials.