IF 3.4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yulia Pronina , Maria Narykova , Mark Kachanov
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引用次数: 0

摘要

这项工作旨在将多孔材料的刚度变化与孔隙空间几何形状的演变联系起来。在简要回顾了相关的微观力学工具后,我们将其应用于几种金属的案例研究。我们特别澄清了孔隙度何时可以或何时不可以作为孔隙空间的单一定量特征来使用,而有效刚度则必须用裂纹密度来表示。也就是说,在各向同性孔隙混合物的形状系数大致相同的情况下,使用孔隙度参数是合理的,前提是孔隙的形状不是强烈扁圆形(长宽比大于 0.08)。考虑过的实例表明,在孔隙呈强扁圆形、裂缝状的情况下,孔隙度值很低时也会出现明显的刚度变化;在这种情况下,必须使用裂缝密度参数。除了根据孔隙空间的适当特征预测有效刚度外,所开发的方法还可以根据刚度变化和孔隙率数据监测孔隙形状的演变。在我们的分析中,孔隙几何形状是通过适当长宽比的球体来建模的;这些球体具有足够的灵活性,可以进行定量建模。理论结果与实验数据的一致性证明了这种建模的充分性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Relating stiffness changes in porous materials to the evolution of pore space
The work aims at relating stiffness changes in porous materials to the evolution of pore space geometry. After a brief review of the relevant micromechanics tools, we apply them to case studies on several metals. In particular, it is clarified, when porosity can or cannot be used as a single quantitative characteristic of the pore space in whose terms the effective stiffness is to be expressed, and when it must be changed to crack density. Namely, the use of porosity parameter is legitimate in cases of isotropic mixtures of pores having approximately equal shape factors, provided the shapes are not strongly oblate (aspect ratios larger than about 0.08). Considered examples show that, in cases of strongly oblate, crack-like pores, noticeable stiffness changes may occur at very low values of porosity; in such cases, the crack density parameter must be used. Besides predicting the effective stiffness in terms of proper characteristics of the pore space, the developed methodology allows monitoring the evolution of pore shapes based on stiffness changes and porosity data. In our analysis, pore geometries are modeled by spheroids of appropriate aspect ratios; they provide sufficient flexibility and allow quantitative modeling. The adequacy of such modeling is supported by agreement of the theoretical results with experimental data.
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来源期刊
Mechanics of Materials
Mechanics of Materials 工程技术-材料科学:综合
CiteScore
7.60
自引率
5.10%
发文量
243
审稿时长
46 days
期刊介绍: Mechanics of Materials is a forum for original scientific research on the flow, fracture, and general constitutive behavior of geophysical, geotechnical and technological materials, with balanced coverage of advanced technological and natural materials, with balanced coverage of theoretical, experimental, and field investigations. Of special concern are macroscopic predictions based on microscopic models, identification of microscopic structures from limited overall macroscopic data, experimental and field results that lead to fundamental understanding of the behavior of materials, and coordinated experimental and analytical investigations that culminate in theories with predictive quality.
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