کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
798358 | 1467162 | 2007 | 37 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: On the influence of local fluctuations in volume fraction of constituents on the effective properties of nonlinear composites. Application to porous materials On the influence of local fluctuations in volume fraction of constituents on the effective properties of nonlinear composites. Application to porous materials](/preview/png/798358.png)
Composite materials often exhibit local fluctuations in the volume fraction of their individual constituents. This paper studies the influence of such small fluctuations on the effective properties of composites. A general asymptotic expansion of these properties in terms of powers of the amplitude of the fluctuations is given first. Then, this general result is applied to porous materials.As is well-known, the effective yield surface of ductile voided materials is accurately described by Gurson's criterion. Suitable extensions for viscoplastic solids have also been proposed. The question addressed in the present study pertains to nonuniform distributions of voids in a typical volume element or in other words to the presence of matrix-rich and pore-rich zones in the material. It is shown numerically and analytically that such deviations from a uniform distribution result in a weakening of the macroscopic carrying capacity of the material.
Journal: Journal of the Mechanics and Physics of Solids - Volume 55, Issue 4, April 2007, Pages 842–878