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研究了壁厚成线性梯度变化的多胞薄壁管结构在轴向冲击载荷作用下的耐撞性。采用了有限元方法构建梯度多胞结构数值计算模型,并以试验验证了其有效性,最后以碰撞峰值力和比吸能为评价指标,分析了梯度变化和平均壁厚对梯度五胞薄壁结构的耐撞性能影响。结果表明,相比于等厚多胞结构,厚度梯度为正时的梯度多胞结构在轴向冲击载荷作用下的耐撞性得到明显的进一步提高。因此,在给定结构质量的条件下,通过合理分布材料,使得多胞结构截面侧壁厚度呈线性梯度变化,可以进一步改善多胞薄壁结构碰撞吸能特性。
The crashworthiness of multi-cell thin-walled tubes with linear gradient of wall thickness under axial impact load was studied. The finite element method was used to construct the numerical model of gradient multi-cell structure. The validity of the model was verified by experiments. Finally, taking the peak force of collision and specific energy absorption as evaluation indexes, the effects of gradient and average wall thickness on the gradient five- Crashworthiness of the structure impacts. The results show that the crashworthiness of the gradient multi-cell structure with the same thickness gradients is obviously improved under the axial impact load compared with the isopachy multi-cell structure. Therefore, under the condition of the given structural mass, the thickness distribution of the cross-section of the multi-cell structure changes linearly by the rational distribution of the material, which can further improve the collision energy-absorbing property of the multi-cell thin-walled structure.