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Contact fatigue solved via FEM

100%

Halama R. , Frydrysek K.

tom z. 21

75-78

This article shows some studies of a low-cycle material fatigue caused :by cyclical contact between the wheel and rail. The wheel is made up from 11523 steel. The problem was solved by FEM (SW Ansys Release 6.1). The results show hysteresis loops, which can be use for the calculating the number of cycles to failure.

On engineering verifications of external and internal fixators for traumatology and orthopaedics

61%

Frydrysek K. , Ucen O. , Fojtik F. , Poruba Z. , Theisz G. , Sejda F. , Michenkova S.

tom T. 21, nr 52

42--50

In this article the authors draw attention to the possibilities of treatment for complicated bone fractures. They present their own design, laboratory tests and numerical solutions (i.e. strength analyses and reliability assessments) of the various types of internal and external fixators applied in traumatology and orthopaedics (i.e. intended for fractures of limbs, pelvis and calcaneus). The new design of external fixators is based on the development of Ilizarov and other techniques (i.e. shape and weight optimization based on composite materials, application of smart materials, nanotechnology, low x-ray absorption, antibacterial protection, patient comfort, reduction in the duration of surgical treatment, and cost). Similarly, the new intramedullary nail C-NAIL (i.e. an example of an internal fixator) is intended for minimal-invasive fixation of intra articular calcaneal fractures.

Experimental and numerical solutions of contact fatigue

51%

Lenert J. , Frydrysek K. , Vaclavek L. , Kucera J. , Fuxa J. , Halama R. , Macura P. , Fiala A. , Fusek M.

tom z. 21

153-158

This article shows: 1. Some studies of a low-cycle material fatigue caused by cyclical contact between two spheres with the same diameters. The spheres are made up from modified 15219 steel. The problem was solved by FEM (SW MSC.MARC/Mentat. The results show hysteresis loops from which the number of cycles umil fracture can be determined.2. The realisation of test device for the research of contact fatigue as complement of the loading test machine INOVA, which is directed to look for quantitative coherence between number of cycles to the origin of fatigue cracks in the area of mechanical contact.