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Modelling of Phase Structure and Stress State of the Rod from the Shape Memory Material at Thermomechanical Loading

Astashkin V., Onyshko O., Bozhenko B., Budz S.

Computational Methods in Science and Technology

2008

Vol. 14, nr 2

81-86

On the basis of the mathematical model proposed before, the phase and stress state of the shape memory rod during torsion and following heating has been determined. Non-uniform distribution of residual stresses induced by a change of the phase structure under loading decreases after heating due to material returning to the initial phase state.

Improvements of medical implants based on modern materials and new technologies

Balazic M., Kopac J.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 25, nr 2

31-34

Purpose: Modern medical implants are products with pretentious requirements regarding materials, machining technologies and their functionality. In general they are divided into two main groups which are permanent and temporary medical implants. To improve implant's performance in the working environment one of the main goals of research and development process is to improve implant's biofunctionality, biocompatibility, corrosion resistance, bioadhesion, processability and availability. Design/methodology/approach: Development of modern medical implants is a multi-stage design and manufacturing process primarily based on computer design, computer numerical simulations and in-vitro tests. Findings: Some improvements could be done with reverse engineering technology which generates a numerical model from the workpiece in order to get a replica or geometric variant for the scanned data. Practical implications: The surgical treatments of bone fractures (osteosynthesis) are divided into external fracture fixation or internal fracture fixation. One of the most common used medical implant for internal fracture fixation is bone fixation plate which holds together the bone fragments. In some cases the improved shape of the plate could results into better biofunctionality and bioadhesion. Originality/value: In this contribution few examples of machining technologies based on CAD-CAM principle, modern materials and research/development process of modern medical implants is presented.