Estimates for linear hardening and effective yield stress of Nano-porous media with non-uniform distribution of voids

المؤلف

Khudayr, Yunus Khalid

المصدر

ZANCO Journal of Pure and Applied Sciences

الناشر

جامعة صلاح الدين قسم النشر العلمي

تاريخ النشر

2016-06-30

دولة النشر

العراق

عدد الصفحات

10

التخصصات الرئيسية

الهندسة الميكانيكية

الملخص الإنجليزي

This study aims at studying first; the relation between the effective yield stress of perfectly plastic matrix and spherical and elliptical voids, 33 numerical tests curried out with different effective yield stress of the matrix (different materials), so as to estimate the relationship between the effective yield stress of the porous media and perfect plastic matrix.

The relationship between the effective yield stress of the matrix and porous media is estimated by a mathematical equation with less than 5% error.

Using finite element method, and within the representative volume element, the porous materials are modeled according to its microstructure.

And second; the proposed model tested numerically and in the case of linear hardening and another relation is estimated between the linear hardening coefficient of the matrix and the porous media.

66 numerical tests curried out, based on the finite elements numerical tests with three dimensional representatives volume elements; these mathematical equations are proposed so as to predict the macroscopic behavior of the porous media, depending on the solid matrix properties.

These numerical simulations show that the porosity volume fraction can has a strong effect on the overall effective yield stress and linear hardening coefficient.

نوع البيانات

أوراق مؤتمرات

رقم السجل

BIM-787280

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