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首页> 外文期刊>Materials Science and Engineering >The effect of irregularity, residual convex units and stresses on the effective mechanical properties of 2D auxetic cellular structure
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The effect of irregularity, residual convex units and stresses on the effective mechanical properties of 2D auxetic cellular structure

机译：不规则性，残余凸单元和应力对二维膨胀蜂窝结构有效力学性能的影响

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摘要

The purpose of the present study is to investigate the influences of changes in the microstructure of the re-entrant auxetic foam during the conversion-based fabrication on its elastic and plastic behaviors. The 2D re-entrant honeycomb is used for the finite element (FE) study. The FE method is firstly validated with theoretical calculations. Then, for the first time, the irregularity of the re-entrant honeycomb is considered in the study of irregularity-mechanical relationship. Compared to the regular re-entrant honeycomb, the irregular structures tend to have lower magnitudes of the effective elastic modulus, yield strength and Poisson's ratio. It is also highlighted that the irregularity has indirect effects on the effective mechanical properties of the re-entrant honeycomb by changing its relative density. Moreover, the residual convex units (the uncompressed convex corners of the conventional foams during the conversion-based fabrication) make the Poisson's ratio of the re-entrant honeycomb less negative. Therefore, the superior abilities brought by the negative Poisson's ratio such as the shear modulus and indentation hardness can be impaired by the residual convex units. Besides, the role of the residual stress is also explored with FE methods. The present study is helpful to the understanding of the structure-mechanical relationship in the auxetic foams.
机译：本研究的目的是研究在基于转化的制造过程中凹入型膨胀泡沫的微观结构变化对其弹性和塑性行为的影响。 2D凹角蜂窝用于有限元（FE）研究。有限元方法首先通过理论计算得到验证。然后，在不规则力学关系的研究中首次考虑了凹角蜂窝的不规则性。与规则的凹入蜂窝相比，不规则的结构往往具有较低的有效弹性模量，屈服强度和泊松比。还需要强调的是，不规则度通过改变其相对密度而对折返蜂窝的有效机械性能产生间接影响。此外，残余凸单元（在基于转换的制造过程中，传统泡沫的未压缩凸角）使凹角蜂窝的泊松比变小。因此，由负泊松比带来的优异能力，例如剪切模量和压痕硬度，可能会因残留的凸单元而受损。此外，还通过有限元方法探讨了残余应力的作用。本研究有助于理解发胀泡沫中的结构-机械关系。

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