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- 2016
微结构对泡沫材料蠕变性能的影响
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Abstract:
针对较低密度开孔泡沫的正四面体模型，通过引入支柱结点处的体积修正使新模型能够用于预测较大密度范围内的泡沫材料的蠕变性能，并且基于该修正模型，分析了斜支柱的弯曲变形机制以及剪切变形机制对蠕变应变率的影响。结果表明：当泡沫材料的相对密度较低时，支柱的弯曲变形机制决定了其蠕变速率；而当相对密度较高时，支柱的剪切变形作用机制开始主导其蠕变速率。通过与实验结果的比较验证了本文预测的有效性。 In this work, the tetrahedral unit cell model, which was suitable for low-density foam, was modified to predict the creep properties of foam materials in a broader range of density varieties, by considering the volume correction at the intersection point of struts. The influences of the bending and shearing deformation mechanisms of the inclined struts on the creep strain rate were investigated based on the modified model. The results indicate that the bending deformation mechanism of struts dominates the creep rate of the foam with a relative low density, and the shearing deformation mechanism dominates the creep rate of the foam with a relative high density. A comparison with the experiment results verified the predictions of the present work. 国家自然科学基金（11472025，11272030）
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