Elastic Deformation Behaviours of Anisotropic Materials

Most industrial materials are usually polycrystalline and thus inherit the preferential crystallographic alignment of individual crystals, or preferred orientation and texture, from workings and heat treatments. If materials have such a texture, their physical and mechanical properties are affected not only by the anisotropy of single-crystal properties, but also by the interactions of each grain with the neighboring grains and grain boundaries. So, these anisotropic materials provide effective informations concerning the mechanism of deformation. In the present paper, the mechanism of elastic deformation of anisotropic materials has been studied by using hot rolled steel plates having such anisotropic texture that would show more notable behaviour of deformation than in isotropic ones. The specimens were stressed stepwise in parallel as well as perpendicular to the rolling direction by using a tensile testing machine. At each stage of the stress application, X-ray beams were radiated to the center of specimen surface, and the Xray elastic constants [formual ommited] on the (211) and (310) diffraction planes were measured. The behaviour of elastic deformation was discussed by comparing the experimental results with the analytical ones, and the effect of texture on [formual ommited] was explained by this theoretical analysis of the results of (211) diffraction plane. On the other hand, from the results of (310) diffraction plane, it was concluded that the actual behaviour of elastic deformation of the anisotropic material used in this study fits comparatively closely to the uniform local stress model rather than to the uniform local strain model. And the disagreement between the uniform local stress model and the actual one remains less than the experimental errors.