近爆荷载下聚氯乙烯泡沫夹芯板的动力学模型研究

Threedeformation stages of PVC foam sandwich panel are analyzed to study the dynamic response of polyvinyl chloride (PVC) foam sandwich panels under close-in blast loading. The deflection surface function is derived, which can reflect the localization characteristics of the panels under close-in blast loading. A single-degree-of-freedom rigid-plastic dynamics model is established, considering the effects of bending moment and membrane force on deformation of panels and core. The dynamic responses of PVC foam sandwich panels with different panel and core thicknesses under close-in blast loading are calculated using the nonlinear numerical calculation software, and the panel deformation and velocity variation are analyzed to verify the force and motion of the panels and core in each stage of the dynamic model. The result shows that the established deflection surface function can reflect the localization characteristics of panel under close-in blast loading, and the localization of panel decreases constinuously during the deformation process. The panel midpoint deflection and velocity-time curves based on the dynamics model fit well with the numerically calculated results, and the difference between the panel midpoint deflection and the experimental result is small. The dynamics model can be used to effectively predict the dynamic response of PVC foam sandwich panels under close-in blast loading.