Abstract: The corresponding relationship between the energy dissipation of splitting and length splitting of metal tube was studied by the experiment of sled collision. The experiment results indicate that the length splitting of metal tube rises with the increase of the energy dissipation; and when the speed of test vehicle increases to 39.81 km/h and the energy dissipation increases to 36 681 J, the length splitting of metal tube increases in a liner trend and the growth factor is intermediary variant Fp≈30 kN. Because the stress change in the process of metal tube splitting is known, the residual deformation mode curls inward and has excellent energy dissipation of splitting under the axial pressure, moreover, the peak load decreases gradually with the increase of the initial speed of the test vehicle.

Key words: traffic and transportation engineering;energy dissipation of splitting, protection device, sled collision, stress

摘要： 采用台车碰撞实验方法对金属圆管撕裂消耗能量与圆管撕裂长度间对应关系进行了研究。结果表明：金属圆管撕裂长度随圆管撕裂能量的增加呈增长趋势，且当台车速度增加至39.81 km/h，撕裂消能能量增加至36 681 J后，金属圆管撕裂长度呈线性增长趋势，增长系数即中间变量Fp≈30 kN；由金属圆管撕裂过程中应力变化情况可知，在轴向压力的作用下，残余变形模态向内卷曲，具有良好的撕裂消能作用，且随着台车初始速度增加，峰值载荷逐渐减小。

关键词: 交通运输工程, 撕裂消能, 防护装置, 台车碰撞, 应力