Aesthethic Complications of Nasal Septum Resection SciDoc Publishers | Open Access | Science Journals | Media Partners

In the present problem the definition of the stress-strain state in the vicinity of an angle. The problem of the angular opening is of significant practical importance in various technological fields. However, the existing criteria do not lead to a complete clarification of all the aspects arising in problems about the angular incision and obtaining exact analytical solutions. For a linear crack in an elastic field a quantitative measure features is the stress intensity factor, which exhaustively characterizes the stress field near the crack. Knowing the stress intensity factor, we can say whether the condition of the body (consisting of mostly elastic material) is critical. The problem of finding the stress intensity factor for small cracks in bodies of finite size have been well studied. For angle incision it is much more complicated: the coefficient of the singularity depends on the angle of the cut and only in the limit coincides with the stress intensity factor, when the neck angle becomes to a bilateral cut (forming a crack). In the case of a complex stressed state for angular incision the stress field has two singular components, so the question remains, what is meant by the stress intensity factor in this case. The situation is exacerbated by the fact that the singularity coefficients are not constants of the material. They depend on the opening of an angle and therefore cannot be determined experimentally. To describe the stress-strain state in the vicinity of the cut a singular component of the stress field must be extracted, that requires the use of following numerical methods. On the corner points of the polygonal holes the stress concentration is observed, as is known, to solve these problems, methods of finite differences, finite elements, boundary elements, with various modifications are applied. It let us to obtain more accurate description of the stress distribution in the border of an angular point. For calculation of stress-strain state of the considered problem we applied the finite element method (FEM) using the triangular finite elements of second order approximation. The application of such elements allowed us to increase the accuracy of determination of stresses in the vicinity of the corner points, when the stress field has an integrable singularity. For the numerical solution of the problem we will use the ANSYS package which has received the greatest application in practice of engineering calculations using the FEM with irregular splitting of items. The number of elements where 5000. As described above in the angular points