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论文类型：期刊论文

发表时间：2022-06-29

发表刊物：航空材料学报

期号：6

页面范围：93-97

ISSN号：1005-5053

摘要：The principles and results were compared between the traditional 2-D deterministic model and random model of voids in the composite materials. The former assumed that all voids had regular shapes with the same size or fixed mathematical distributions distributed in isotropic homogeneous media. Based on the random medium theory, the latter investigated the random morphology of voids utilizing statistical method and characterized the elastic fluctuations from voids as small scale heterogeneities superimposed on the matrix, which is described by a spatial autocorrelation function with zero mean and some statistic parameters. It is found that, in terms of the random void model, not only good agreement of the geometry of voids between the modulations and microscopic images is observed, but also the predicted ultrasonic attenuation coefficient matches well the experimental results. It is concluded that the random void model is significantly superior to the traditional deterministic model for describing the morphology of voids in the composite materials.

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