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Mechanical characterisation of auxetic cellular structures built from inverted tetrapods

机译：由倒四足体构建的疏松细胞结构的机械表征

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The paper is concerned with mechanical behaviour characterisation of auxetic cellular structures built from inverted tetrapods. The auxetic cellular structures were fabricated from the Ti-6Al-4 V alloy powder using the selective electron-beam melting method (SEBM). The fabricated specimens were experimentally subjected to different loading conditions by varying the loading direction and velocity (strain rate). In addition, the influence of the porosity on the mechanical response and deformation behaviour was analysed based on experimental compression tests supported by infrared thermography. The experimental results show that the porosity and loading direction have a major influence on the mechanical response, while the strain rate influence is negligible at analysed strain rates. The experimental results were also used to validate the computational lattice model of analysed structures computed by the LS-DYNA finite element code. The experimental and computational results were in good agreement for most of analysed geometries and loading cases.
机译：该论文涉及由倒四足动物构建的生长细胞结构的力学行为表征。使用选择性电子束熔化方法（SEBM）由Ti-6Al-4 V合金粉末制造可膨胀的蜂窝状结构。通过改变加载方向和速度（应变率），对制作的标本进行了不同的加载条件实验。另外，基于红外热成像技术支持的实验压缩试验，分析了孔隙度对机械响应和变形行为的影响。实验结果表明，孔隙率和加载方向对机械响应有重要影响，而在分析的应变速率下，应变速率的影响可以忽略。实验结果还被用来验证由LS-DYNA有限元代码计算的分析结构的计算晶格模型。对于大多数分析的几何形状和加载情况，实验和计算结果均吻合良好。

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