A nonlinear dynamic analytical approach is formulated aiming to investigate the dynamic interfacial debonding mechanism in sandwich panels. The approach is derived using the variational principle of virtual work and it incorporates the Extended High-Order Sandwich Panel Theory with a cohesive interface modeling for the interfaces between the face sheets and the core. The model adopts the first-order shear deformation theory kinematic assumptions for the face sheets along with a geometrically nonlinear behavior. The high-order small deformations kinematic assumptions that account for out-of-plane compressibility are considered for the core layer. The two interfaces link the three components of the panel together and the nonlinear traction-displacement laws introduce the interfacial nonlinearity into the model. The model considers dynamic effects in order to assess the influence of the inertial terms on the interfacial debonding mechanism and to examine the coupling between the two. The results of the dynamic analysis are compared with results of a static analysis for two cases: a sandwich panel with a pre-existing delamination subjected to an end-shortening loading and an intact sandwich panel subjected to three-point-bending. In the second case, the interfacial debonding triggers a dynamic response that substantially affects the structural behavior. The dynamic results, the assessment of the time scales of the process, and the comparison with the static results shed light on the significance of the dynamic nature of the interfacial debonding failure mechanism.

提出了一种非线性动力学分析方法，旨在研究夹芯板的动态界面剥离机理。该方法是使用虚拟工作的变分原理派生的，并且将扩展的高阶夹心板理论与面板和核心之间的界面的内聚界面建模相结合。该模型采用了面板的一阶剪切变形理论运动学假设以及几何非线性行为。核心层考虑了平面外可压缩性的高阶小变形运动学假设。这两个接口将面板的三个组件链接在一起，非线性牵引力-位移定律将界面非线性引入模型中。该模型考虑了动力学效应，以便评估惯性项对界面剥离机制的影响并检查两者之间的耦合。动态分析的结果与静态分析的结果在两种情况下进行了比较：带有预先分层的夹层板承受末端缩短载荷，而完整的夹层板经受三点弯曲。在第二种情况下，界面剥离会触发动态响应，从而大大影响结构行为。动态结果，过程时间尺度的评估以及与静态结果的比较揭示了界面脱粘破坏机理的动态性质的重要性。