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Badania wytrzymałości kolejowego połączenia zakładkowego

Niezgoda T., Derewońko A., Kosiuczenko K.

Prace Naukowe Politechniki Warszawskiej. Mechanika

2007

z. 217

97-102

The modeling of strustural adhesive-bonded joints is complex because of presence of singularities at the ands of the joint and the lack of applicable faiture criteria. Lots of researchers notice that the typically faiture occurs after forming a damage zone at the end of the joint. In this paper a non-linear finite element analysis (FEA) is employed to study the state of stress in the adhesive-bonded joints (SLJ i.e. single lap joints). Different kinds of failure modes of these joints were observed. The stresses were computed using software implementation of FEM the MSC finite element programs. The model was validated by the corresponding structural test. The specimens were exposed to damage in the universal Instron testing machine. Correlation between the experimental results and finite element simulation is reasonably good. The final aim of the paper is to establish failure criterion.

Three-dimensional nonlinear finite element model of the human lumbar spine segment

Lodygowski T., Kąkol W., Wierszycki M., Ogurkowska M.

Acta of Bioengineering and Biomechanics

2005

Vol. 7, nr 2

17-28

The objective of this paper is a three-dimensional modelling of vertebral segment (L4-L5), which can be used for numerical simulation of surgery, analysis of spinal equilibrium and stability. Because of the extreme complexity of finite element modelling we propose to carry out analyses on the simplified model. The geometry of vertebrae is known due to the computer tomography (CT) or nuclear magnetic resonance (NMR). CAD model is built and then imported into FEA program. The model under consideration, i.e. the model of spinal segment, consists of two bones and an intervertebral disc. The mechanical properties of tissues, boundary/interaction conditions and loadings accepted for computations are based on the literature and our own studies. The simplified model was proposed, developed and validated for several loading schemes, including axial compression, bending and torsion.

Three-dimensional nonlinear finite element model of lumbar intervertebral disc

Lodygowski T., Kąkol W., Wierszycki M., Ogurkowska M.

Acta of Bioengineering and Biomechanics

2005

Vol. 7, nr 2

29-37

The main objective of this study is to model a three-dimensional nonlinear finite-element vertebra disc, which can be used in further simulation of human lumbar spinal segments in surgery, analyses of spinal equilibrium and stability. Because of complexity of modelling it is proposed to cary* out analyses on the simplified model built in such a way that the nonlinear response of the disc is replaced by a spring-type behaviour whose characteristics are obtained by computer simulations of an isolated disc. The geometry data of a human lumbar spinal segment, including a disc, is acquired from the computer tomography or magnetic nuclear resonance measurements, and a CAD model is designed and imported into FEA program. The simplified model was validated for loading schemes, including axial compression, bending and torsion acting on the spinal L4-L5 segment. Two models of intervertebra disc are shown and theirs advantages and accuracy are discussed.