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首页> 外文期刊>Computer Methods in Applied Mechanics and Engineering >Effective elastic moduli of nonspherical particle-reinforced composites with inhomogeneous interphase considering graded evolutions of elastic modulus and porosity
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Effective elastic moduli of nonspherical particle-reinforced composites with inhomogeneous interphase considering graded evolutions of elastic modulus and porosity

机译：关于弹性模量和孔隙率分级演进的非均相差异性的有效弹性模态的非均相差异化复合材料

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摘要

Recent experimental studies have found that interphase between particles and matrix possesses inhomogeneous configurations of elastic modulus and porosity. Such inhomogeneous properties of interphase play an important role in macroscopic mechanical properties of particle-reinforced composites (PRCs). In this work, a comprehensive micromechanical framework is devised to predict the elastic properties of PRCs containing spheroidal particles and their surrounding inhomogeneous interphase zones with the graded evolutions of elastic moduli and porosity. In the present framework, the elastic modulus gradient of interphase varies in terms of a power-law and its porosity gradient is characterized by virtue of a semi-empirical model originated from the test of cementitious composite experiments. The elastic properties of two-phase PRCs with aligned and randomly distributed spheroidal inclusions are first described through the double-inclusion model. The inhomogeneous properties of interphase are then incorporated into the prediction of the overall elastic modulus of PRCs by using the combination of the generalized self-consistent scheme with the double-inclusion model, which is essentially a general n-phase graded spheroid model. Comparison with experimental data indicates this proposed micromechanical framework is a reliable means to evaluate the elastic properties of PRCs. Furthermore, the predicted results elucidate the coupled effects of elasticity and porosity gradients in the interphase, spheroidal particle size and shape, and water-cement ratio have significantly impacts on the effective elastic modulus of PRCs, suggesting that the properties of such materials can be tailored via proper composite engineering and design. (C) 2019 Elsevier B.Y. All rights reserved.
机译：最近的实验研究发现，颗粒和基质之间的间隔具有弹性模量和孔隙率的不均匀配置。间间的这种不均匀性质在粒子增强复合材料（PRCS）的宏观力学性能中起重要作用。在这项工作中，设计了一种综合的微机械框架，以预测含有球体颗粒的PRC的弹性性质及其周围的非均匀间间区，具有弹性模态和孔隙率的分级演进。在本框架中，间界性的弹性模量梯度在动力法方面变化，并且其孔隙率梯度的特征在于源自水泥复合实验的试验的半经验模型。通过双层模型首先描述具有排列和随机分布的球状夹杂物的两相PRC的弹性性质。然后通过使用具有双层模型的通用自我一致方案的组合来掺入相互异位的不均匀性能通过使用双层模型的组合来预测PRC的总弹性模量，这是一般的N相梯度球状模型。与实验数据的比较表明，该提出的微机械框架是评估PRC的弹性特性的可靠手段。此外，预测结果阐明了相互作用，球状粒度和形状中弹性和孔隙梯度的耦合效应，水水泥比对中国的有效弹性模量显着影响，这表明这种材料的性质可以定制通过适当的复合工程和设计。 （c）2019年Elsevier B.Y.版权所有。

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