多层级夹芯结构的变形与能量吸收

Deformation and Energy Absorption of Multi-Hierarchical Sandwich Structures

采用数值模拟与理论分析相结合的方法研究了多层级波纹板夹芯结构在准静态压缩载荷下的变形规律与能量吸收性能,建立了结构临界失效载荷的计算公式,并与数值模拟结果进行了对比,理论预测与数值模拟结果吻合较好。分析了芯层厚度对二级芯层结构在压缩载荷下的变形模式及能量吸收性能的影响,并与一级结构进行了对比。结果表明:二级芯层结构的能量吸收性能显著优于一级芯层结构;随着结构芯层厚度增加,二级结构的比吸能和载荷效率增大;芯层厚度较小时二级单层结构的比吸能高于二级双层和三层结构,二级双层结构的比吸能略高于二级三层结构。

The deformation law and energy absorption performance of the multi-hierarchical sandwich structure under quasi-static compression have been studied by numerical and theoretical methods.The calculation formula of the critical failure load of the structure is established and compared with the numerical simulation results.The theoretical prediction is in good agreement with the numerical simulation results.Finite element models of the hierarchical corrugated core sandwich structure were established.The effects of core thickness on the deformation mode and energy absorption performance of secondary structure under quasi-static compression load were studied and compared with that of the primary structure.The results show that the energy absorption properties of the secondary core structure are significantly better than that of the primary core layer.As the thickness of the core increases,the specific energy absorption of the second order structure for single-layer is higher than that of the second order structure for two-layers and three-layers,and the specific energy absorption of the second order structure for two-layers is slightly higher than that of the second order structure for three-layers.