Abstract: A 12-node Special solid elements with a traction-free cylindrical surface is derived using the assumed stress hybrid model. The assumed stress field satisfies the equilibrium equations in the element and the traction-free boundary condition over the cylindrical boundary. Numerical results have indicated that the distributions of the circumferential stress and stress concentration factors a thin plate or thick plate with eccentric hole under tension by the use of coarse meshes.

Key words: 3-D stress concentration, Plate with eccentric hole, Special hybrid stress element