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arXiv 1604.03589cond-mat.mtrl-scicond-mat.soft
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细胞结构弹性中的尺寸和无序效应:从离散模型到连续表示

Size and Disorder Effects in Elasticity of Cellular Structures: From Discrete Models to Continuum Representations

Stefan Liebenstein, Stefan Sandfeld, Michael Zaiser

摘要:

开孔固体通常具有随机的微观结构,这些微观结构可能包含特征长度尺度,例如单元尺寸。这就产生了尺寸相关的机械性能,其中大系统的行为与小系统不同。此外,这些结构通常是不规则的,这不仅影响尺寸依赖性行为,而且导致不同微结构实现之间的显著性质变化。蜂窝状微结构的计算模型是基于梁的网络。它是一种计算效率高的方法,允许从计算大量的实现中获得统计上有代表性的平均值。为了详细分析潜在的变形机制,开发了一种能量一致的连续化方法,该方法将离散梁网络的力和位移与等效的空间连续应力和应变场联系起来。该方法不仅可用于评估和可视化目的,而且还允许执行例如,连续应力模式-一种分析方法,非常有利于对不同程度的结构无序进行微观结构的比较和统计分析。

英文摘要:

Open cellular solids usually possess random microstructures that may contain a characteristic length scale, such as the cell size. This gives rise to size dependent mechanical properties where large systems behave differently from small systems. Furthermore, these structures are often irregular, which not only affects the size dependent behaviour but also leads to significant property variations among different microstructure realizations. The computational model for cellular microstructures is based on networks of Timoshenko beams. It is a computationally efficient approach allowing to obtain statistically representative averages from computing large numbers of realizations. For detailed analysis of the underlying deformation mechanisms an energetically consistent continuization method was developed which links the forces and displacements of discrete beam networks to equivalent spatially continuous stress and strain fields. This method is not only useful for evaluation and visualization purposes but also allows to perform ensemble averages of, e.g., continuous stress patterns - an analysis approach which is highly beneficial for comparisons and statistical analysis of microstructures with respect to different degrees of structural disorder.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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