Verbylo D. Physical regularities of deformation and failure of high porous materials

The object - mechanisms of deformation and failure of high porous materials. Aim - investigation of physical regularities of deformation and failure of high porous structure materials taking into account effect of overall materials structure (porous and crystalline level defect structure). Methods - structure analysis by using of scanning electron microscopes SUPERPROBE 732 and T-20 ("Jeol", Japan), mechanical tests ( four-point bending and uniaxial compression) by using of CERAMTEST machine with registration of microplasticity curves. Novelty - elaborated is a new methodology of high porous materials structural optimization allowing the influence of solid phase structure and porous space morphology on mechanical properties formation to be accounted for. Generalizing scheme of porosity influence on elastic modulus of high porous materials of different classes is firstly proposed. On expression for dependence of elastic modulus on porosity is obtained, taking into account parameters to characterize theporous space morphology. Firstly mechanical behavior of nickel in microplasticity range in terms of solid phase deforming stress as well as regularities of high porous materials failure taking into account solid phase failure mechanisms were investigated. Practical significance of results obtained - elaborated structure models of high porous materials deformation and failure allow their mechanical properties on the basis of parameters of solid phase and the porous space structure to be prognosticated. The obtained relationship between high porous material structure and its mechanical properties can be used as basis to develop principles of high porous materials structural engineering and to evaluate their damping capability.