A "Sequential Design of Simulations" approach for exploiting and calibrating discrete element simulations of cohesive powders
A "Sequential Design of Simulations" approach for exploiting and calibrating discrete element simulations of cohesive powders
复制标题
用于开发和校准粘性粉末的离散元模拟的“模拟顺序设计”方法
DOI：
10.1007/s11705-021-2131-1
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发表时间：
2022
影响因子：
4.5
通讯作者：
Chen X
中科院分区：
文献类型：
--
作者：
Chen X
采用试验设计方法指导下的离散元方法，对粘性颗粒在环剪试验中的流动行为进行了数值模拟和研究。采用完全析因设计作为筛选设计，以揭示颗粒材料性质的影响。将筛选设计扩展为响应面设计，建立了宏观剪切应力与颗粒性质之间的关系。结果表明，粉末在剪切盒中的流动可分为四个区域。剪切应力被发现是敏感的颗粒摩擦系数，表面能和杨氏模量。在高摩阻低粘聚力区，剪应力有较大的波动。在高粘聚力区，杨氏模量对初始流动点处的剪切应力的影响比对预剪切过程中的剪切应力的影响更显著。响应面设计的预测进行了验证，并与测得的剪切应力从舒尔茨环剪切试验。结果表明，在各种固结条件下，模拟结果与试验结果吻合良好，验证了“序贯模拟设计”方法的优越性和可行性。
The flow behaviours of cohesive particles in the ring shear test were simulated and examined using discrete element method guided by a design of experiments methodology. A full factorial design was used as a screening design to reveal the effects of material properties of partcles. An augmented design extending the screening design to a response surface design was constructed to establish the relations between macroscopic shear stresses and particle properties. It is found that the powder flow in the shear cell can be classified into four regimes. Shear stress is found to be sensitive to particle friction coefficient, surface energy and Young’s modulus. A considerable fluctuation of shear stress is observed in high friction and low cohesion regime. In high cohesion regime, Young’s modulus appears to have a more significant effect on the shear stress at the point of incipient flow than the shear stress during the pre-shear process. The predictions from response surface designs were validated and compared with shear stresses measured from the Schulze ring shear test. It is found that simulations and experiments showed excellent agreement under a variety of consolidation conditions, which verifies the advantages and feasibility of using the proposed “Sequential Design of Simulations” approach.