Abstract This study investigates experimentally and numerically the resistance to separation between composite skins and different complex geometries of the corrugated core filled with PVC foam. To this purpose, three different geometries including simple foam core without any corrugated composite, longitudinal trapezoid, and square cores are considered and manufactured as waved (corrugated) composite core. In each specimen, an artificial pre-crack is located between the skin and core and then the effect of the skin's thickness and the core shaped on the debonding growth are examined for the first time. Three-point bending tests are carried out using ENS (End Notch Shear) fixture. Furthermore, the nonlinear response due to separation initiation and propagation between the skins and the core is investigated by employing the cohesive zone model (CZM) using ABAQUS finite element software. In fact a finite element model has developed to simulate debonding in sandwiched structures, and experimentally validated the model with the aim to improve the performance of sandwiched structures. A good agreement is found between the experimental and numerical results. According to the results, between the longitudinal trapezoid, and square cores, for the same increased in the weight percentage of sandwich panel, the square core is suggested as an optimal design having the highest bonding strength.

中文翻译：

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弯曲载荷作用下夹芯板复合蒙皮与波纹泡沫复合芯材脱粘生长的研究

摘要 本研究通过实验和数值研究了复合材料表皮与填充有 PVC 泡沫的波纹芯的不同复杂几何形状之间的抗分离性。为此，考虑了三种不同的几何形状，包括没有任何波纹复合材料的简单泡沫芯、纵向梯形和方形芯，并将其制造为波形（波纹）复合芯。在每个试样中，在表皮和芯部之间放置一个人工预裂纹，然后首次检查表皮厚度和芯部形状对脱粘生长的影响。三点弯曲测试使用 ENS（端部切口剪切）夹具进行。此外，通过使用 ABAQUS 有限元软件的内聚区模型 (CZM)，研究了由于表皮和核心之间的分离启动和传播引起的非线性响应。事实上，已经开发了一个有限元模型来模拟夹层结构的脱粘，并通过实验验证了该模型，旨在提高夹层结构的性能。在实验和数值结果之间发现了很好的一致性。结果表明，在纵向梯形和方形芯材之间，在夹芯板重量百分比增加的情况下，方形芯材被认为是具有最高结合强度的优化设计。并通过实验验证了该模型，旨在提高夹层结构的性能。在实验和数值结果之间发现了很好的一致性。结果表明，在纵向梯形和方形芯材之间，在夹芯板重量百分比增加的情况下，方形芯材被认为是具有最高结合强度的优化设计。并通过实验验证了该模型，旨在提高夹层结构的性能。在实验和数值结果之间发现了很好的一致性。结果表明，在纵向梯形和方形芯材之间，在夹芯板重量百分比增加的情况下，方形芯材被认为是具有最高结合强度的优化设计。