Evaluation of Interlaminar Interfacial Stiffnesses and Ply Complex Moduli of Carbon/Epoxy Composite Laminates by Ultrasonic Transmission Characteristics
Evaluation of Interlaminar Interfacial Stiffnesses and Ply Complex Moduli of Carbon/Epoxy Composite Laminates by Ultrasonic Transmission Characteristics
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通过超声波传输特性评估碳/环氧复合材料层压板的层间界面刚度和层复合模量
DOI：
10.11395/jjsem.17.124
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
石井 陽介，琵琶 志朗，足立 忠晴
中科院分区：
文献类型：
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作者：
石井 陽介，琵琶 志朗，足立 忠晴
从超声波透射特性出发，对碳/环氧复合材料层合板的层间界面刚度和铺层复弹性常数进行了无损估算。采用穿透透射浸没技术，测量了由相同UD材料制成的单向、准各向同性和正交铺层复合材料层合板在不同频率和入射方向下的纵波能量透射系数。然后将计算结果与理论值进行拟合，用刚度矩阵法将薄的层间树脂富集区建模为具有法向和切向弹簧的界面，以确定层间界面刚度以及构成层合板的层片的各向异性粘弹性常数。实验结果验证了该评价方法的有效性。评估的帘布层复合模量被发现具有相当的值，无论层压板的堆叠顺序。另一方面，当相邻铺层具有不同的纤维取向角时，层间界面刚度较小。
The interlaminar interfacial stiffnesses and the ply complex elastic constants of carbon/epoxy composite laminates were evaluated nondestructively from the ultrasonic wave transmission characteristics. Using the through-transmission immersion technique, the energy transmission coefficient of longitudinal wave was measured for unidirectional, quasi-isotropic, and cross-ply composite laminates made of the same UD prepregs for various frequencies and incident directions. The results were then fitted to the theoretical ones calculated by the stiffness-matrix approach with the thin interlaminar resin-rich regions modeled as interfaces with normal and tangential springs in order to identify the interlaminar interfacial stiffnesses as well as the anisotropic viscoelastic constants of the ply constituting the laminates. The validity of the evaluation method was verified on the basis of the experimental results. The evaluated ply complex moduli were found to have comparable values irrespective of the stacking sequence of the laminate. On the other hand, the interlaminar interfacial stiffnesses were found to be smaller when the neighboring plies had the different fiber orientation angles.