锻压技术

梯度五胞薄壁管高速冲击吸能特性仿真研究

英文标题：Research on simulation of high speed impact absorbing energy characteristics in five-cell thin-wall structure with thickness gradient

作者：刘胜郑刚伍素珍徐峰祥

单位：湖南大学武汉理工大学汽车零部件技术湖北省协同创新中心

关键词：多胞结构厚度梯度轴向冲击耐撞性

分类号：TG302

出版年,卷(期):页码：2015,40(11):94-99

摘要：

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。

It was mainly studied the crashworthiness of multi-cell thin-wall structure with the thickness gradient under axial impact load. The finite element model of the five-cell thin-wall structure with uniform thickness was established and its effectiveness was validated by experiments. Finally, the peak impact force (PCF) and specific energy absorption (SEA) were regarded as the evaluation indexes, and the influences of the thickness gradient and the equivalent thickness on the crashworthiness of five-cell thin-wall structure with the thickness gradient were analyzed. The results show that compared with the multi-cell structure with a uniform thickness, the crashworthiness under axial impact load for multi-cell structure with the positive thickness gradient is more obviously. Therefore, under the condition of given structure mass, the reasonable material distribution makes the wall thickness in cross section of multi-cell structure varies along a linear gradient, and the crash energy absorption characteristic of multi-cell thin-wall structure can gain a further improvement.

基金项目：

国家自然科学基金资助项目(11102067）

刘胜（1988-），男，硕士研究生

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