Abstract In this paper, the nonlinear dynamic behavior of a laminated composite plate with sandwich stiffener subjected to the non-uniform blast load is investigated. The main plate examined has four layers carbon/epoxy and the stiffeners composed of carbon/epoxy face sheets and polypropylene honeycomb core. The experimental and theoretical studies are carried out in order to investigate the effect of sandwich stiffeners on the dynamic response of laminated composite plates under the blast load. In the theoretical study, the equations of motion of the stiffened laminated composite plate are derived by the use of virtual work principle. Geometric nonlinearities are modelled by taking von Karman Large Deformation Theory into account for the sandwich plate. The clamped boundary conditions are considered for all edges of the plate. The equations of motion are discretized into the time domain by using Galerkin's method. The nonlinear coupled equations system is solved by NDSOLVE function of Mathematica Software and the displacements, strains and stresses are calculated in order to investigate the stiffened laminated composite plate's response to the blast load. The experimental, theoretical and numerical analysis results are compared.

中文翻译：

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爆炸荷载作用下加筋复合板的动力学分析：新模型和实验验证

摘要 本文研究了非均匀爆炸载荷作用下夹层加劲肋复合板的非线性动力学行为。检查的主板具有四层碳/环氧树脂和由碳/环氧树脂面板和聚丙烯蜂窝芯组成的加强筋。为了研究夹层加劲肋对爆炸载荷作用下层合复合板动力响应的影响，进行了实验和理论研究。在理论研究中，利用虚功原理推导出加筋复合板的运动方程。通过将 von Karman 大变形理论考虑在内，对夹层板的几何非线性进行建模。板的所有边缘都考虑了夹紧边界条件。使用伽辽金方法将运动方程离散到时域中。利用Mathematica软件的NDSOLVE函数求解非线性耦合方程组，计算位移、应变和应力，以研究加筋层合复合板对爆炸载荷的响应。比较了实验、理论和数值分析结果。