1.Chengdu Aeronautic Vocational and Technical College, Chengdu 610100,China；2.Institute of Product Quality Standard(Ministry of Water Resources), Hangzhou 310012, China
Abstract：Acoustic emission signals for carbon fiber composite materials in tensile damage is analyzed by moving cut data approximate entropy(MC-ApEn). Based on disorder and complexity of AE signals and dynamics equilibrium, the paper describes and explains their approximate entropy spectrum characteristics of matrix cracking, fiber/matrix debonding, fiber breaking. In addition, the time correlation curves for AE energy, counts and load are also investigated by MC-ApEn. Because different trends in transition will cause APEn mutation, the results show tensile fracture process of CFPR is divided into three different stages by two structure point and according to the evolution features of stages, the critical load of tensile failure for composite materials is recommend.
2014, Vol. 33 
