| 姚如洋,龚立平,侯秀慧,郝文乾,张婉琪,刘海明,尹冠生*.基于实验和数值模拟的深度梯度刻槽管轴向耐撞性研究[J].实验力学,2018,33(5):707~715 |
| 基于实验和数值模拟的深度梯度刻槽管轴向耐撞性研究 |
| On the axial crashworthiness of depth gradient grooved tube based on experimental study and numerical simulation |
| 投稿时间：2018-05-21 修订日期：2018-06-12 |
| DOI：10.7520/1001-4888-18-122 |
| 中文关键词: 深度梯度刻槽管 能量吸收 耐撞性 屈曲模式 力-位移曲线 |
| 英文关键词:depth gradient grooved tube energy absorption crashworthiness buckling mode force-displacement curve |
| 基金项目:国家自然科学基金(11402035) |
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| 中文摘要: |
| 带有外部周向宽刻槽的金属圆管受轴向冲击时将产生稳定的轴对称皱褶，因而是一种性能卓越的吸能元件。然而，均匀设置的刻槽将导致皱褶产生部位的随机性。为进一步控制刻槽管的屈曲模式并提高其轴向耐撞性，对其沿管长方向设置连续的深度梯度刻槽。通过精确的实验和数值模拟对深度梯度刻槽管在不同冲击速度和冲击端下的耐撞性进行了讨论。结果表明：刻槽管在轴向压溃过程中将产生随机渐进屈曲、随机塑性屈曲及顺序渐进屈曲三种变形模式。深度梯度刻槽管更容易产生稳定的顺序渐进屈曲模式，并能克服高速冲击带来的局部效应。此外，深度梯度的加入能够大幅度增强刻槽管轴向的耐撞性。 |
| 英文摘要: |
| Metallic circular tube with external circumference wide grooves will produce stable axisymmetric wrinkles when subjected to axial impact, so it is an excellent energy absorption element. However, uniformly arranged grooves will result in randomness the place where the wrinkle is produced. In order to further control the buckling mode of grooved tube and improve its axial crashworthiness, a continuous depth gradient groove is arranged along the length direction of the pipe. The crashworthiness of depth gradient grooved circular tube under different impact velocities and impact ends is discussed by accurate experiment and numerical simulation. Results conclude that the tube deformation can be classified into three buckling modes, namely, random asymptotic buckling, random plastic buckling, and sequential asymptotic buckling. The depth gradient grooved tube is easy to generate sequential asymptotic buckling and can overcome the local effect caused by high-speed impact. Additionally, the axial crashworthiness of grooved tube can be greatly enhanced by the depth gradient. |
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