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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Diatom frustule-filled epoxy: Experimental and numerical study of the quasi-static and high strain rate compression behavior
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Diatom frustule-filled epoxy: Experimental and numerical study of the quasi-static and high strain rate compression behavior

机译：硅藻壳填充环氧树脂：准静态和高应变率压缩行为的实验和数值研究

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摘要

In this study, centric type diatom frustules obtained from a diatomaceous earth filter material were used as filler in an epoxy resin with a weight percentage of 15% in order to assess the possible effects on the compressive behavior at quasi-static and high strain rates. The high strain rate testing of frustule-filled and neat epoxy samples was performed in a split-Hopkinson pressure bar (SHPB) set-up and modeled using the commercial explicit finite element code LS-DYNA 970. Result has shown that 15% frustule filling of epoxy increased both modulus and yield strength values at quasi-static and high strain rates without significantly reducing the failure strain. Microscopic observations revealed two main deformation modes: the debonding of the frustules from the epoxy and crushing/fracture of the frustules. The modeling results have further confirmed the attainment of stress equilibrium in the samples in SHPB testing following the initial elastic region and showed good agreement with the experimental stress-time response and deformation sequence of the samples in high strain rate testing.
机译：在这项研究中，从硅藻土过滤材料获得的中心型硅藻壳被用作环氧树脂中15％重量百分比的填料，以评估在准静态和高应变速率下对压缩行为的可能影响。在分体式霍普金森压力杆（SHPB）装置中进行了无壳填充物和纯净环氧树脂样品的高应变率测试，并使用商业化的显式有限元代码LS-DYNA 970进行了建模。结果表明，无壳填充物占15％在准静态和高应变速率下，环氧树脂的用量增加了模量和屈服强度值，而没有显着降低破坏应变。显微镜观察显示出两种主要的变形模式：壳状体与环氧树脂的脱粘和壳状体的破碎/破裂。建模结果进一步证实了在初始弹性区域之后的SHPB测试中，样品达到了应力平衡，并与高应变率测试中样品的实验应力-时间响应和变形序列吻合良好。

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