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Rate Dependence of the Compressive Response of Ti Foams

机译：钛泡沫压缩响应的速率相关性

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Titanium foams of relative density ranging from 0.3 to 0.9 were produced by titanium powder sintering procedures and tested in uniaxial compression at strain rates ranging from 0.01 to 2,000 s−1. The material microstructure was examined by X-ray tomography and Scanning Electron Microscopy (SEM) observations. The foams investigated are strain rate sensitive, with both the yield stress and the strain hardening increasing with applied strain rate, and the strain rate sensitivity is more pronounced in foams of lower relative density. Finite element simulations were conducted modelling explicitly the material’s microstructure at the micron level, via a 3D Voronoi tessellation. Low and high strain rate simulations were conducted in order to predict the material’s compressive response, employing both rate-dependant and rate-independent constitutive models. Results from numerical analyses suggest that the primary source of rate sensitivity is represented by the intrinsic sensitivity of the foam’s parent material.
机译：通过钛粉末烧结程序生产相对密度为0.3至0.9的钛泡沫，并在0.01至2,000 s -1 的应变速率下进行单轴压缩测试。通过X射线断层摄影术和扫描电子显微镜（SEM）观察来检查材料的微观结构。研究的泡沫对应变速率敏感，屈服应力和应变硬化都随施加的应变速率而增加，并且应变速率敏感性在相对密度较低的泡沫中更为明显。通过3D Voronoi细分，进行了有限元模拟，从而在微米级别上对材料的微观结构进行了显式建模。为了预测材料的压缩响应，使用了速率依赖性和速率无关性本构模型进行了低和高应变速率模拟。数值分析的结果表明，速率敏感性的主要来源是泡沫母体材料的固有敏感性。

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