1.Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics, Aircraft Strength Research Institute of China, Xi’an 710065, China;
2.Key Laboratory of Advanced Ship Materials and Mechanics, Harbin Engineering University, Harbin 150001, China
Abstract：The dynamic response of the hierarchical gradient PVC foam clamping plate underwater explosion load was numerically analyzed using ANSYS / LS_DYNA. For six foams with a density of 79 kg / m3, 107 kg / m3, 134 kg / m3, 162 kg / m3, 203 kg / m3, 252 kg / m3, by changing the density of different foam core layers Density gradient settings have been designed with two types of different density gradient spans. The backplane peak deflection and energy absorption are selected as the structural anti-water explosion performance evaluation index, which discusses the influence of different density gradient alignment structural dynamic responses, and compared with homogeneous configurations. The results show that the reasonable setting of the foam core layer density can effectively improve the explosion resistance of the structure; the density gradient of the core layer is greater than the high-density gradient LGD configuration is greater than the small-density gradient SGD configuration. Small-density gradient configuration LGD-3 has the smallest back plate peak deflection, providing a reference for designing high quality anti-water explosion performance foam sandwich panels.
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