Ishii Yosuke, Biwa Shiro
Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8540, Japan.
Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8540, Japan.
Ultrasonics. 2023 Dec;135:107135. doi: 10.1016/j.ultras.2023.107135. Epub 2023 Aug 10.
An ultrasonic nondestructive evaluation procedure is presented for the ply and interleaf layer properties of carbon/epoxy composite laminates having interleaf resin layers at their interlaminar interfaces. It is shown that the material properties of plies (density, thickness, and transversely isotropic complex elastic moduli) and elastic interleaf layers (density, thickness, Young's modulus, and Poisson's ratio) can be identified by best fitting the theoretical energy transmission spectra of longitudinal waves through the laminate immersed in water to those obtained in ultrasonic measurement. It is also demonstrated that compared to the mass-less and null-thickness spring-type interlaminar interface model employed in the previous works, the present finite-thickness interleaf layer model can better reproduce the experimental transmission spectra of a unidirectional interleaved composite laminate containing ultrasonic bandgaps. Furthermore, the property characterization in the case where the plies and interleaf layers are assumed to be elastic and viscoelastic, respectively, is also examined. It is also shown that the ply and interleaf layer properties determined for the unidirectional laminate can be used to reproduce the transmission spectra measured for a quasi-isotropic laminate consisting of the same plies and interleaf layers.
本文提出了一种超声无损评估方法，用于评估在层间界面处具有中间层树脂层的碳/环氧复合层压板的铺层和中间层性能。结果表明，通过将纵向波在水中穿过层压板的理论能量传输谱与超声测量得到的谱进行最佳拟合，可以识别铺层的材料性能（密度、厚度和横向各向同性复弹性模量）以及弹性中间层的材料性能（密度、厚度、杨氏模量和泊松比）。此外，与先前工作中采用的无质量和零厚度弹簧型层间界面模型相比，本文提出的有限厚度中间层模型能够更好地再现包含超声带隙的单向交错复合层压板的实验传输谱。此外，还研究了分别假设铺层和中间层为弹性和粘弹性情况下的性能表征。结果还表明，为单向层压板确定的铺层和中间层性能可用于再现由相同铺层和中间层组成的准各向同性层压板的测量传输谱。
