Inclusion Interaction Of Numerical Calculation And Experimental Research

The inhomogeneity of materials often leads to the partial damage and evolution of the material, including the emergence of the crack (void) and propagation. The problems of the inhomogeneity materials such as the static and dynamic damage, and fracture mechanics are much more complicated than those of the homogeneous materials, too. They mainly display that the inclusions together with their interaction are closely related to the static and dynamic characteristic of the material's fracture. In addition, the characteristic is changing according to the space position .The study of the inclusions and their interaction is of great academic importance in macro-fracture mechanics, micro-fracture mechanics and compound materials.The equivalent inclusion method is one of the most important methods in the micro-mechanics. Under the condition of the interaction among multi-inclusions, the computer program based on the equivalent inclusion method can be used to calculate the stress field as well as strain field of the material. Moreover, with the MATLAB software, the calculation results can be illustrated in three-dimensional figures. The calculated results coincide quite well with the numerical computation results in the literature. The numerical computation program can be used to not only study the damage evolution and failure of composite materials, but also to calculate the stress field and strain field of cracks by using the special ellipsoid to simulate the crack.The interference among different kind of inclusions has been studied with the help of the classic holography and the digital holography measurement system. The satisfactory holograms are obtained. It can be concluded from the interference between the circular holes, elliptical holes and cracks that amplification effect or shielding effect are always existent among the different inclusions. There exist obviously gradient strain stripes among the holes. When the distance among cracks are not very close, the amplification effect among cracks will mainly lead to high strain field, vary the propagation path of crack and propel the connection among cracks. These experiments verify the results of the numerical calculation...