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中文摘要：
SPH方法作为一种具有无网格、拉格朗日性质的动力学求解算法,已经广泛应用于冲击动力学的研究。采用SPH-FEM耦合分析和8组试验进行半球壳冲击土壤的对比分析,比较加速度时程曲线和局部变形图,验证SPHFEM方法在处理此类问题中的适用性。利用SPH-FEM方法得到的能量和冲击力时程曲线,归纳出土壤的能量耗散机理。分析表明,数值模拟结果和试验结果吻合较好,SPH-FEM方法能胜任模拟半球壳冲击土壤的整个过程。土壤是一种很好的能量缓冲体。
英文摘要：
SPH method as a meshless Lagrange dynamic solving method is widely applied in studying impact dynamics. Here,the SPH-FEM coupled method and 8 tests were adopted to analyze a hemispherical shell impact soil.The acceleration time history curves and local deformations obtained with SPH-FEM coupled method were compared with those gained in tests to validate the applicability of SPH-FEM method. The energy dissipation mechanism of soil was generalized with the energy and impact force time history curves obtained using SPH-FEM method. The results showed that the numerical simulation results agree well with the test ones; SPH-FEM coupled method can be used to correctly simulate the whole process of a hemispherical shell impact soil,soil is a good energy buffer.
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