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In this paper, fracture mechanics in orthotropic plates, stress and displacement distributions around the crack tip in an anisotropic material are considered. Classical displacement based finite elements, elements with penalized equilibrium and elements with drilling degrees of freedom are employed. The path independent integrals J and I* are applied to orthotropic fracture mechanics problems to determine the stress intensity factor at the crack tip. Again, convergence studies are done, and the path independence of J and I* are investigated for orthotropic problems. Numerical results for typical fracture specimens are presented and discussed. The effect of the degree of anisotropy and fiber orientation on the stress intensity factor is also demonstrated.

This paper deals with the analytical modelisation and the numerical simulation of fluid structure interaction (FSI) phenomena of pipeline. The equations of motions and equilibrium are coupled together taking into account the influence of the fluid flow inside the pipe. The fluid circulating in the pipe has the flexional motion as that of structure. The analytical model is based on the Newtonian approach. The practicability of the calculation model and the effects of fluid-structure interaction are illustrated by calculations for some simple systems, for pipe with boundary condition pinned-pinned. Independently of the analytical method, a numerical modal analysis is realized in the fluid structure configuration. This configuration has been simulated by coupling the two commercial solvers: Fluent code of fluid mechanical (CFD, Computational Fluid Dynamics), and ANSYS classical code of structure mechanical (CSD, Computational structure Dynamics) for pipes with different boundary conditions: pinned-pinned, clamped-pinned and clamped-clamped. We describe the technique used to solve the equations associated in the determination of natural frequencies. For this, we use code ANSYS Workbench where the equations are discritized with finite element method. The results obtained numerically are similar to those obtained by the analytical approach. [ABSTRACT FROM AUTHOR]

This paper deals with the development of two new boundary element algorithms for solving 3D, frictional, and linear elastostatic contact problems. The main contribution of this research is that solving 3D boundary element models with nonconforming discretizations becomes possible for the first time by using the proposed algorithms. The new algorithms provide the contact constraint equations that will be added to the underdetermined linear system of equations. These algorithms are implemented in a new 3D boundary element code using c ++ and verified using several numerical examples. For the models studied, the results using the new boundary element algorithms match well with the finite element results and clearly demonstrate the feasibility of the new boundary element approach for 3D contact analysis. Keywords: BEM, three-dimensional contact, nonconforming discretizations

This paper deals with the development of two new boundary element algorithms for solving 3D, frictional, and linear elastostatic contact problems. The main contribution of this research is that solving 3D boundary element models with nonconforming discretizations becomes possible for the first time by using the proposed algorithms. The new algorithms provide the contact constraint equations that will be added to the underdetermined linear system of equations. These algorithms are implemented in a new 3D boundary element code using c+ + and verified using several numerical examples. For the models studied, the results using the new boundary element algorithms match well with the finite element results and clearly demonstrate the feasibility of the new boundary element approach for 3D contact analysis. [ABSTRACT FROM AUTHOR]