膨胀-劈裂组合模式下薄壁圆管的吸能性能研究

Study on Energy Absorption Performance of Thin-Walled Circular Tube Under Expansion-Splitting Combined Deformation Model

结合薄壁圆管轴向压缩试验设计和数值计算,建立了该组合模式下压模结构参数与吸能性能参数之间的响应面模型,发现载荷响应量与上锥角和压模外径呈单调递增关系,但随着下锥角的增大先减小后增大,其比能量吸收率随着上下锥角和压模外径的增大而增大。依据响应面模型和相应目标函数,开展了压模结构的优化设计,获得了能够实现最优能量吸收性能的压模结构设计参数,并与渐进压溃模式下薄壁圆管的吸能性能进行了对比,结果表明在一定的压模结构设计下的组合变形模式,其吸能性能优于渐进压溃变形模式。

The response surfaces between the structural parameters of the die and the energy absorption performance parameters of the thin-walled circular tube in this combined model were established by the design of experiment and numerical calculation,it is found that the load responses is monotonically increasing with the upper conical angle and the out diameter of the die,but first decreases and the increases with the increasing of the lower conical angle.According the response surface model and the corresponding objective function,the optimized design of the die structure was carried out to achieve the optimal energy absorption performance of the circular tube,and that was compared with that of the tube under progressive collapse,the result show the energy absorption performance of the combined deformation is better than that of the progressive crushing deformation under the die of certain structural parameters.