三周期极小曲面(TPMS)能够避免局部应力集中现象,有效地提高能量吸收性能。典型的TPMS结构包括了Primitive、Gyroid、Diamond、IWP(I-graph and Wrapped Package-graph)等。为了提升管路系统的能量吸收性能,通过对Gyroid梯度结构的分析,设计了梯度吸能结构,并研究了不同承载角度下梯度Gyroid结构的能量吸收规律。研究表明：轴向梯度Gyroid结构在压溃过程中呈现出分层逐步破坏的特性,相比于均匀Gyroid结构,提升了其在压缩阶段的平台应力,从而其结构的比能量吸收性能在0°、15°、30°、45°、60°、75°和90°时分别提高了1.59%、4.58%、10.74%、30.66%、18.44%、7.75%和1.54%,所有角度的平均比吸能提高了10.67%；Gyroid结构孔隙率线性梯度的变化未对承受压缩载荷时的变形响应造成显著影响。因此,轴向梯度Gyroid结构可保证压溃变形不变的情况下,提高结构的能量吸收能力。

Triply periodic minimal surface (TPMS) can avoid localized stress concentration phenomena and effectively improve energy absorption performance. Typical TPMS structures include Primitive, Gyroid, Diamond, and IWP (I-graph and Wrapped Package-graph). In order to enhance the energy absorption performance of the piping system, the gradient energy- Gyroid of absorbing structure was designed and the influence of load-bearing angles on the energy absorption performance was investigated. It was shown that the axial gradient Gyroid structure exhibited a hierarchical gradual destruction during the compression collapse process, which elevated its plateau stress in the compression stage compared to the uniform Gyroid structure, thereby increasing the specific energy absorption performance of the structure by 1.59%, 4.58%, and 10.74% at 0°, 15°, 30°, 45°, 60°, 75°, and 90°, respectively, 30.66%, 18.44%, 7.75% and 1.54%, and the average specific absorption energy for all angles increased by 10.67%; the change in the linear gradient of the porosity of the Gyroid structure did not significantly affect the deformation response when subjected to compressive loading. Therefore, the axial gradient Gyroid structure can ensure that the energy absorption capacity of the structure can be improved with no change in the compression and collapse deformation.

TK221

热能动力技术重点实验室开放基金资助项目(TPL2022A01)