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以碰撞吸能部件——吸能盒为研究对象,利用差厚板制成不同截面形状的新型变壁厚吸能盒,通过控制壁厚变化来控制压溃顺序和吸能增量,取消了原有诱导槽的设计和加工工序。通过压溃实验对其在轴向载荷下的压溃过程进行实验研究,选取失效模式、初始峰值、平均载荷和比耗能4个指标,研究了截面形状对变壁厚吸能盒变形行为的影响。研究结果发现:变壁厚管的截面边数越多,周向受力越均匀,失效模式就越倾向于对称模式,变形越稳定;平均载荷和比耗能等参数随着截面边数的增加而加大;管截面对称程度高时压溃的初始峰值较大。
Taking the collision energy-absorbing element-energy-absorbing box as the research object, a new variable wall thickness energy-absorbing box with different cross-sectional shapes was made by using a thick thick plate. The collapse order and the increment of energy absorption were controlled by controlling the wall thickness variation. The original groove design and processing induced. Through the crushing experiment, the crushing process under axial load was experimentally studied, and the failure modes, the initial peak value, the average load and the specific energy loss were selected to study the effect of cross-section shape on the deformation behavior of the box influences. The results show that the more the cross section of the wall pipe increases, the more uniform the circumferential stress, the more the failure mode tends to the symmetrical mode and the more stable the deformation. The parameters such as average load and specific energy dissipation increase with the increase of the number of sides While the initial peak value of crush is high when the degree of symmetry of the pipe section is high.