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首页> 外文期刊>Journal of Materials Science >A multiscale study of damage in elastomeric syntactic foams
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A multiscale study of damage in elastomeric syntactic foams

机译：弹性句法泡沫损伤的多尺度研究

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Damage mechanisms in elastomeric syntactic foams filled with glass microballoons (GMB) and resulting effects on the macroscale elastic constants have been investigated. Direct numerical simulations of the material microstructure, composite theory analyses, and uniaxial compression tests across a range of filler volume fractions were conducted. The room temperature and elastic behavior of composites with undamaged, fully debonded, and fully crushed GMBs were investigated for syntactic foams with a polydimethylsiloxane matrix. Good agreement was obtained between numerical studies, composite theory, and experiments. Debonding was studied via finite element models due to the difficulty of isolating this damage mechanism experimentally. The predictions indicate that the bulk modulus is insensitive to the state of debonding at low-GMB-volume fractions but is dramatically reduced if GMBs are crushed. The shear behavior is affected by both debonding and crush damage mechanisms. The acute sensitivity of the bulk modulus to crushed GMBs is further studied in simulations in which only a fraction of GMBs are crushed. We find that the composite bulk modulus drops severely even when just a small fraction of GMBs are crushed. Various material parameters such as GMB wall thickness, volume fraction, and minimum balloon spacing are also investigated, and they show that the results presented here are general and apply to a wide range of microstructure and GMB filler properties.
机译：已经研究了填充玻璃微旋钮（GMB）的弹性术泡沫中的损伤机制，并研究了对Macroscale弹性常数的产生效果。进行了材料微观结构，复合理论分析和在一系列填料级分之间的直接数值模拟，复合理论分析和单轴压缩试验。对具有未损坏，完全禁止和完全粉碎的Gmbs的复合材料的室温和弹性行为用于用聚二甲基硅氧烷基质进行句法泡沫。在数值研究，复合理论和实验之间获得了良好的一致性。由于实验地隔离了这种损坏机制，通过有限元模型研究了剥离。预测表明，如果Gmbs被压碎，则散装模量对借助于低导入的状态的状态不敏感。剪切行为受到剥离和压碎损伤机制的影响。在模拟中进一步研究了批量模量对粉碎Gmbs的急性敏感性，其中仅粉碎了一部分Gmbs。我们发现，即使仅在粉碎的一小部分GMBS时，复合体积模量也会严重下降。还研究了各种材料参数，例如Gmb壁厚度，体积分数和最小球囊间距，并且他们表明这里呈现的结果是通用的并且适用于各种微观结构和GmB填充性。

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