Pietro Marveggio, Matteo Zerbi, Irene Redaelli, Claudio di Prisco
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引用次数: 0
摘要
颗粒流体与刚性障碍物之间的动态相互作用是一种复杂的现象,其特点是位移大、应变率高。如果将流动质量建模为连续体,则其数值模拟需要先进的计算工具和能够预测同一材料在流体和固体状态下机械行为的构成关系。在本文中,作者采用了基于材料点法(MPM)的开源 ANURA3D 代码和多态构成模型。模拟了一系列以不同速度、初始空隙率、前倾角和撞击质量长度为特征的撞击。将 MPM 数值结果与使用离散元素法 (DEM) 数值代码获得的结果进行了严格比较。结果表明,模型模拟从流体到固体以及从固体到流体的材料状态转换的能力,对于再现 DEM 数据所证明的流动质量的机械响应至关重要。
Granular material regime transitions during high energy impacts of dry flowing masses: MPM simulations with a multi-regime constitutive model
The dynamic interaction between granular flowing masses and rigid obstacles is a complex phenomenon characterised by both large displacements and high strain rates. In case the flowing mass is modelled as a continuum, its numerical simulation requires both advanced computational tools and constitutive relationships capable of predicting the mechanical behaviour of the same material under both fluid and solid regimes. In this paper, the authors employed the open-source ANURA3D code, based on the Material Point Method (MPM), and a multi-regime constitutive model. A series of impacts characterised by different velocities, initial void ratios, front inclinations and impacting mass lengths have been simulated. The MPM numerical results are critically compared with those obtained by using a Discrete Element Method (DEM) numerical code. The model capability of simulating material regime transitions, from fluid to solid and vice versa, is shown to be crucial for reproducing the mechanical response of the flowing mass put in evidence by DEM data.
期刊介绍:
The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.