ИСТИНА

The direct boundary integral equations method is used for solution of stress concentration and interfacial fracture mechanics problems. The The stress concentration analysis for some models of turbine blades walls with oblique and onical holes has been performed for different angles of the hole axis obliquity. Stress concentration analysis in dental implants consisted of the two stages: 1) analysis of the structure as a whole with smoothed screw at the junction of an implant with a bone; 2) analysis of stress concentration in the screwed junction at the interface between the implant and bone. The following model parameters were investigated: the mechanical properties of implants and surrounding bones; screw thread shape; the quality of junction conditions between implants and bones - from complete slip to full osseointegration. In the latter case the boundary between the implant screw thread and the bone was considered based on the weak interface model.