高速冲击下钢索波动行为SPH模拟研究  

Numerical Simulation of Behavior of Cable Wave under High⁃speed Impact via SPH Algorithm

作　　者：赵明基 王发展[1] 黄克鹏 ZHAO Mingji;WANG Fazhan;HUANG Kepeng(School of Mechanical and Electrical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学机电工程学院,西安710055

出　　处：《机械科学与技术》2022年第8期1183-1190,共8页Mechanical Science and Technology for Aerospace Engineering

基　　金：陕西省自然科学基金重点项目(2011J2009)。

摘　　要：针对高速冲击下钢索波动行为问题,分别采用人工黏性与镜像粒子法相结合的SPH算法和FEM对冲击过程进行数值模拟,得到了高速冲击下钢索应力波的传播规律。结果对比可知:钢索中心处产生形变时粒子相互挤压,内外两侧部分粒子产生反应力;外侧产生断裂时,波峰处粒子产生相切于应力传递方向较大主应力,且中心带粒子呈圆弧状分布;内侧未断裂时,部分粒子产生绝对值较大的反应力;完全断裂后,中心处粒子主应力方向指向冲击方向;冲击应力随着冲击角度的增大而减小,随着摩擦因数的增大而增大。通过理论验证了仿真模型的准确性,具有重要的工程借鉴价值。两种算法的系统总能量损耗相似,但采用SPH算法对进行数值模拟计算的精度更高,效率更高,表明了SPH算法的优越性。Aiming at the wave behavior of steel cable under high⁃speed impact,SPH algorithm combining with artificial viscosity and mirror particle method and FEM method are used to simulate the impact process,and the propagation law in stress wave of steel cable under high⁃speed impact is obtained.The results show that when the deformation occurs at the center of the cable,the particles squeeze each other,and some particles on both sides produce reaction forces.When the fracture occurs in the outside,the particles at the wave crest are tangent to each other and the main stress is larger in the direction of stress transfer,and the particles in the central zone are distributed in an arc shape.When the inner side is not broken,some particles produce larger absolute reaction force.After complete fracture,the main stress direction of the particle at the center points to the impact direction.The impact stress decreases with the increasing of impact angle and increases with the increasing of friction coefficient.The accuracy of the model is verified by theoretical comparison,which has engineering reference.The total energy loss of the two algorithms is similar,but the SPH method is more accurate and efficient,which shows the superiority of SPH method.

关 键 词：钢索 高速冲击 SPH算法 FEM 数值模拟 

分 类 号：O39[理学—工程力学]