Exploring dendrite coherency with the discrete element method

Exploring dendrite coherency with the discrete element method
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用离散元方法探索枝晶相干性

DOI:
10.1016/j.actamat.2011.11.042
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发表时间:
2012
期刊:
影响因子:
9.4
通讯作者:
Yuan L
Yuan L
中科院分区:
材料科学1区
文献类型:
--
作者:
Yuan L

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采用颗粒离散元法(DEM)模拟了铝合金等轴凝固过程中从球状到等轴枝晶转变的晶体重排过程。结果表明,DEM是能够捕捉到的关键实验结果报告在过去的枝晶相干性的研究,即:在剪切阻力显着增加,在一个关键的固体分数,晶体形态对枝晶相干性的影响,和枝晶相干性标志着发病的bracancy。枝晶的一致性被证明是最低的固体分数在长距离的力链网络的互联性在剪切过程中的发展。进一步发现,枝晶相干性取决于两个内部的固体分数内的枝晶信封和信封在相干的平均形状。然后讨论了将离散元扩展到铸造问题中的糊状区力学模拟的潜力。
The particulate discrete element method (DEM) is used to simulate crystal rearrangement during equiaxed solidification of Al alloys for a range of morphologies across the globular to equiaxed-dendritic transition. It is shown that DEM is able to capture the key experimental results reported in past dendrite coherency studies, namely: the marked increase in resistance to shear at a critical solid fraction, the influence of crystal morphology on dendrite coherency, and that dendrite coherency marks the onset of dilatancy. Dendrite coherency is shown to be the lowest solid fraction at which long-range interconnectivity in the force chain network develops during shear. It is further found that dendrite coherency depends on both the internal solid fraction within dendrite envelopes and the mean shape of envelopes at coherency. The potential to extend DEM to the simulation of mushy-zone mechanics in casting problems is then discussed.
DOI: 10.1007/s11661-001-0110-1
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