Shockwaves in Jammed Ductile Granular Media
Shockwaves in Jammed Ductile Granular Media
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堵塞的延性颗粒介质中的冲击波
DOI：
10.1115/1.4053622
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Geubelle, Philippe H.
中科院分区：
文献类型：
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作者：
Fonseka, R. Devanjith;Awasthi, Amnaya;Lambros, John;Geubelle, Philippe H.
我们研究了冲击波在有限的，无摩擦颗粒介质中的传播，采用弹塑性接触定律的离散元模拟。根据约束和加载的水平，弹塑性系统表现出类似于弹性赫兹系统的弱或强冲击传播响应，尽管冲击发展的细节与弹性情况明显不同。两种模式的动态应力传播观察到的冲击强度制度的基础上：弱冲击进行通过初始接触路径的应力，而强冲击形成新的接触网络后面的前面。然而，与弹性冲击波传播不同的是，强冲击波的波前速度有一个上限，这个上限取决于最大粒间接触刚度。由于弹塑性接触是一个耗散过程，结果表明，耗散与围压增强弱冲击区。
We investigate shock propagation in confined, frictionless granular media using discrete element simulations with an elastoplastic contact law. Depending on the level of confinement and loading, elastoplastic systems exhibit a weak or strong shock propagation response similar to an elastic Hertzian system although the details of the shock development differ markedly from the elastic case. Two modes of dynamic stress propagation are observed based on the shock intensity regime: weak shocks carry the stresses via the initial contact path while strong shocks form new contact networks behind the front. However, unlike for elastic shock propagation, there is an upper bound to the front velocity of strong shocks that depends on the maximum intergranular contact stiffness. Since elastoplastic contact is a dissipative process, results show that dissipation is enhanced with confining pressure in the weak shock regime.