接触强度和诱导槽对泡沫铝锥管耐撞性分析

The study of Contact Strength and Inducing Groove on Crashworthiness of Aluminum Foam-Filled Tapered Thin-Walled Structures

针对汽车前纵梁耐撞部件吸能盒结构形式,研究了功能密度梯度泡沫铝填充铝合金锥管在低速冲击下的耐撞性模型优化。通过对泡沫铝填充锥管的轴向低速压溃仿真分析,获得仿真变形状态、载荷及比吸能量对位移的曲线,并对比分析仿真和实验数据,证明仿真模型的有效性。以泡沫铝内核与锥管的接触强度为研究对象,研究其对泡沫铝填充锥管吸能性能的影响。最后提出基于强粘结接触模型的含有诱导槽的功能密度梯度泡沫铝填充模型,并研究其耐撞性。研究表明,具有诱导槽的强粘结泡沫铝填充锥管在碰撞中的峰值载荷更低,载荷变化更平稳,比吸能更大,是一种在汽车制造工程应用中可以考虑的新型吸能结构。

Based on the structure of vehicle front rail crashworthiness components absorbing box,a model optimization was performed to study crashworthiness of functionally graded density aluminum foam-filled tapered thin-walled structures at a low speed impact.Through calculation of FE model at low axial speed impact,deformation style and load-displacement curve and energy absorption-displacement curve are obtained and FE model are validated by comparing the curves of FE simulation and experiment results.Energy absorption character has been analyzed based on different contact models between aluminum foam and tapered tube.Finally,an optimization model with high strength contact model and inducing grooves has been proposed to study the crashworthiness performance.The result shows that the strong bonding between aluminum foam and the taped tube with inducing groove is a new energy absorbs structure that can be used in vehicle front rail structures.In the low speed collision,the peak load of the structure is lower,the load change is more stable and the specific energy absorption is greater than the traditional aluminum foam filled taped tube.