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Fatigue algorithm for dental implant

100%

Wierszycki M. , Kąkol W. , Łodygowski T.

tom No. 7

363-380

Restorations with the application of implants are effective and commonly used in dental treatment. The computer simulation of implant fatigue life employing FEA is considered in the paper. For the simulation of implant structure behavior a 3D model including a spiral thread is applied, which allows for the full simulation of the kinematics of the implant, describing the multiaxial state of stress and, in consequence, the possibility of screw loosening. The cyclic scheme of the physiological occlusal loading and fatigue changes of dental material, bone loss phenomenon and changeability of boundary conditions are investigated. The valuable results for fatigue life which may be applied in modern prosthodontics are presented.

Analysis of thin-walled bars with open and closed-open cross-sections

100%

Garstecki A. , Kąkol W. , Rzeszut K.

tom Vol. 48, iss. 4

345-355

The paper presents the numerical analysis of global and local buckling of columns made of steel cold-rolled, very thin-walled cross-sections of sigma (S) and double sigma (2S) type. Variation of the buckling stress for a wide range of slenderness ratio is presented. The deformation of the contour associated with different buckling modes and warping of open and closed-open sections is discussed, too. The exactness and numerical efficiency of different methods are studied on several examples. Finite Element Method incorporating the Vlasov beam element and shell element is compared with the Finite Strip Method.