Influence of the multiscale distribution of particles on elastic properties of concrete

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• 作者：Julie Escoda^a ; Franç ; ois Willot ; ^a ; ^{francois.willot@ensmp.fr" class="auth_mail" title="E-mail the corresponding author} ; ^{francois.willot@mines-paristech.fr" class="auth_mail" title="E-mail the corresponding author} ; Dominique Jeulin^a ; Julien Sanahuja^b ; Charles Toulemonde^b
• 关键词：FFT methods ; Homogenization ; Concrete ; Multiscale microstructures ; Linear elasticity
• 刊名：International Journal of Engineering Science
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：98
• 期：Complete
• 页码：60-71
• 全文大小：7349 K

文摘

The mechanical role of the shape of the aggregates, and their spatial distribution in concrete materials is examined. The effect on the macroscopic mechanical response as well as on the local stress fields are investigated by numerical means, making use of a recently developed Poisson-polyhedra model in which the aggregates have polyhedral shapes. Comparison is made with previous microstructure models of spheres. Full-field computations are carried out on large volume size using Fourier methods. The field maps are used to determine zones of highest stress. Furthermore, the scale separation hypothesis for the computation of the elastic properties is investigated using numerical calculations on various multiscale microstructures. Finally, numerical predictions for the elastic properties are compared to experimental measurements, and the results discussed.