Study of the Elastic and Elastoplastic Properties of a Dispersed Composite Based on Computational Experiments

In the paper, the averaging method was used to determine the effective elastic moduli of dispersed B 4 C/2024Al composites and porous geomaterials using 2D and 3D X-ray images of their internal structure. A comparison of calculated values of Young’s modulus with experimental data showed that the use of 2D models of the real structure led to underestimated values of Young’s modulus, especially for porous materials. It was found that 3D models with model inclusions in the form of ellipsoids could be used to estimate the effective elastic moduli for composites with inclusion concentrations to 20%. Computational experiments on 3D models of the B 4 C/2024Al composite showed that the stress concentration in its inclusions and matrix was significantly higher when the real inclusions were considered instead of ellipsoidal ones. The dynamic behavior of the dispersed B 4 C/2024Al composite was studied using models with inclusions in the form of ellipsoids. Stress concentrations under dynamic loading were significantly higher than those in statics. The elastoplastic behavior of the real structure of the B 4 C/2024Al composite was investigated in computational experiments on uniform compression, pure shear, and a combination of pure shear and uniform compression. Calculations considering the real structure of inclusions showed that the pure shear diagram depended on the uniform compression, although such a dependence was absent for the matrix material.