三维多重混杂针织结构复合材料横向冲击破坏和性质表征的中期报告摘要：本文研究了三维多重混杂针织结构复合材料的横向冲击破坏和性质表征。样品通过横向冲击实验和高速摄像技术进行破坏特性分析，结果表明，该复合材料具有较高的弯曲刚度和弯曲强度，但在横向冲击实验中易发生层间剪切破坏和微裂纹扩展，其破坏表现为层间撕裂和纤维拉断。同时，利用SEM技术观察了破坏表面和断口形貌，分析了断口形貌和破坏模式之间的关系，并测量了材料的密度、孔隙率等物理性质。结果表明，样品的密度为1.4g/cm3左右，孔隙率小于4%。关键词：三维混杂针织结构；复合材料；横向冲击；破坏机理；性质表征Abstract：Thispaperstudiesthetransverseimpactfractureandpropertycharacterizationof3Dmulti-layeredhybridknittedstructurecompositematerials.Thesampleswereanalyzedforfracturecharacteristicsthroughtransverseimpactexperimentsandhigh-speedphotographytechniques.Theresultsshowedthatthecompositematerialhadhighbendingstiffnessandstrengthbutwaspronetointer-layershearfailureandmicro-crackpropagationduringtransverseimpactexperiments.Itsfailurewasmanifestedasinter-layertearingandfiberpulling.Atthesametime,usingSEMtechnologytoobservethefracturesurfaceandthefracturemorphology,andanalyzingtherelationshipbetweenthefracturemorphologyandthefracturemode.Physicalpropertiessuchasdensityandporosityofthematerialwerealsomeasured.Theresultsshowedthatthedensityofthesamplewasaround1.4g/cm3,andtheporositywaslessthan4%.Keywords:3Dhybridknittedstructure;compositematerial;transverseimpact;failuremechanism;propertycharacterization