通过对碳纤维编织复合材料的拉伸实验,利用声发射技术(Acoustic Emission,简称“AE”)和数字图像相关(DigitalImage Correlation,简称“DIC”)方法研究碳纤维复合材料的损伤演化规律.通过采集试件在拉伸过程中的声发射信号、损伤变形与应变场信息,分析碳纤维编织复合材料的力学加载、变形场和声发射特征参数的关系.结果表明复合材料的位移场、应变场信息以及AE信号特征参数能良好地描述复合材料在拉伸状态下的损伤累积和破坏过程.在加载前期,以40～60 dB低幅度信号为主;随着载荷增加,撞击累计数急剧升高,高幅度、高持续时间信号增多.通过DIC测得的位移场和应变场信息,发现对于相同的载荷增量,加载方向的位移和最大拉应变呈先增加后减小的趋势.
The damage evolution of carbon fiber braided composites was studied by using the acoustic emission (AE) and digital image correlation (DIC) method.The relationship between mechanical loading,deformation and strain field and acoustic emission characteristic parameters of carbon fiber braided composites was analyzed by collecting acoustic emission signals and damage deformation field information during tensile test.The results show that the displacement,strain field and the AE signal characteristic parameters of the composites can describe the damage accumulation and failure process of the composites during tensile test.The tensile process is divided into two stages:damage accumulation stage and damage stage.In the early stage of loading,low amplitude signals with the amplitude from 40 to 60 dB are generated.As the load increases,the number of cumulative hits increases dramatically,and high-amplitude,high-duration-time signal means that a variety of damages occur at the same time in damage stage.In addition,it is found that the displacement and the maximum tensile strain increase and then decrease in the same load increment measured by DIC.
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