The dynamic response analysis and optimization of polyurea coated corrugated sandwich panels under low speed impact

DOI:	10.11809/bqzbgcxb2025.01.039
Keywords:	polyurea elastomer; corrugated sandwich panel; impact resistance; numerical simulation; response surface method
Abstract:	To investigate the impact resistance of polyurea coated corrugated sandwich panels. Numerical simulation of the dynamic response process of sandwich panels under the impact of cylinders is carried out using LS DYNA finite element analysis software. This paper analyzes the effects of different coating methods on the maximum deflection (Defl), peak impact load (Peak) and deformation pattern of sandwich panels. On this basis, the multi objective optimization design of the back side coated (B type) structure is carried out. Finally, the reinforcement mechanism of polyurea is analyzed. The results show that the coating of polyurea can effectively enhance the impact resistance of sandwich panels. Compared to the uncoated (O type) structure, the highest decrease in Defl is in the B type structure with a decrease of 7.17%, and the highest decrease in Peak is in the impact side coated (A type) structure with a decrease of 7.87%. Compared to the unoptimized sandwich panels, the optimized sandwich panels showed a 49% reduction in Defl. It is also found that increasing the thickness of polyurea improves the impact resistance of the sandwich panel. Finally, it is observed that the improvement in the impact resistance of the sandwich panels is mainly attributed to the enhancement of plastic bending moments and membrane forces in the polyurea coated sandwich panels. This study provides a potential new way to improve the impact resistance of all metal sandwich structures.
Issue:	Vol. 46 No. 1 (2025)
Published:	2025-01-31
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