挤压铝合金车身前纵梁耐撞性研究

Study on Crashworthiness of Extruded Aluminum Front Longitudinal Beam

车身前纵梁是汽车发生正碰时吸能和传递载荷的重要部件。为提高车身前纵梁的耐撞性和轻量化水平,利用CAE分析研究了不同截面形状铝合金前纵梁50km/h冲击载荷下的总吸能量、碰撞力峰值及其变形模式。结果表明,"日"字形截面前纵梁适用性最佳。搭载某纯电动车型,50km/h全正碰试验后,前纵梁前端发生轴对称变形,吸能模式合理,后段未发生折弯失稳。

The front longitudinal beam(FLB) is one of the most important parts which absorb the impact energy and transfer load. In order to improve the crashworthiness and lightweight, the total energy absorption, the peak value of collision force and the deformation mode of the aluminum alloy FLB with different sections under 50 km/h impact load were studied. The results showed that the FLB with heliform section was the best. After the 50 km/h full frontal collision test, axisymmetric deformation occurred at the front of FLB, energy absorption mode was reasonable, and bending instability was not discovered at the rear of FLB.