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Mechanical and thermal properties of fly ash/vinyl ester syntactic foams

机译:粉煤灰/乙烯基酯复合泡沫的机械和热性能

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摘要

Vinyl ester matrix syntactic foams filled with hollow fly ash cenospheres are evaluated for quasi-static and high strain rate compressive, flexural and thermal properties. The results are analyzed to understand the effect of cenosphere parameters such as density and wall thickness on the properties of syntactic foams. The elastic energy absorption under compression, until the peak stress, increased with increasing strain rates for all cenosphere volume fractions. The flexural strength decreased by 73% while the flexural modulus increased by 47% at 60 vol.% cenospheres, in comparison to the neat resin. The coefficient of thermal expansion (CTE) was observed to decrease by 48% corresponding to an increase in cenosphere content from 30 to 60 vol.%. Cenospheres are produced as a by-product of coal combustion and their structure contains numerous defects. Therefore, mechanical properties of cenospheres cannot be directly measured. An existing theoretical model was utilized to predict the cenosphere modulus using the experimental flexural modulus values and the results were confirmed with the CTE values. These results can be used to tailor the mechanical and thermal properties of syntactic foams based on the application parameters.
机译:评估了填充有空心粉煤灰空心球的乙烯基酯基复合泡沫塑料的准静态和高应变率压缩,弯曲和热性能。分析结果以了解诸如密度和壁厚的空心层参数对句法泡沫性质的影响。对于所有空心层体积分数,直到峰值应力的压缩状态下的弹性能量吸收都随着应变速率的增加而增加。与纯树脂相比,在60 vol。%的空心层中,弯曲强度降低了73%,而弯曲模量却提高了47%。观察到热膨胀系数(CTE)下降了48%,对应于空心层含量从30%增至60%(体积)。空心球是煤炭燃烧的副产品,其结构包含许多缺陷。因此,无法直接测量空心球的机械性能。利用现有的理论模型,利用实验的弯曲模量值来预测空心球模量,并用CTE值确认结果。这些结果可用于根据应用参数调整复合泡沫的机械和热性能。

著录项

  • 来源
    《Fuel》 |2014年第4期|240-249|共10页
  • 作者单位

    Composite Materials and Mechanics Laboratory, Mechanical and Aerospace Engineering Department, Polytechnic Institute of New York University, Brooklyn, NY 11207, USA;

    Composite Materials and Mechanics Laboratory, Mechanical and Aerospace Engineering Department, Polytechnic Institute of New York University, Brooklyn, NY 11207, USA;

    Composite Materials and Mechanics Laboratory, Mechanical and Aerospace Engineering Department, Polytechnic Institute of New York University, Brooklyn, NY 11207, USA;

    Composite Materials and Mechanics Laboratory, Mechanical and Aerospace Engineering Department, Polytechnic Institute of New York University, Brooklyn, NY 11207, USA;

    Materials Department, University of Wisconsin, Milwaukee, WI 53201, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fly ash; Cenospheres; Polymer matrix composites; Porosity;

    机译:粉煤灰;空心球聚合物基复合材料;孔隙率;

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