Fehmi Erzincanli

Finite element modelling and analysis of a new cemented hip prosthesis

In this study, four different stem shapes for hip prosthesis have been designed to investigate an optimum stem shape. The stem shapes have geometries of varying curvatures. The first stem has standard straight geometry. The other two have notched geometries and the last one has curved geometry. The notched and curved types have been intended to reduce sliding of the implant in the bone-cement. They have been also aimed the implant to stick to the bone-cement securely. The static and dynamic FE analyses of the stems have been conducted using implicit commercial finite element code. The static analyses have been conducted using a load of an average body weight. The dynamic analyses are performed using a load of walking condition of a human. Based on static and dynamic FE analysis results, safety factors for fatigue life of the hip prosthesis have been calculated. Fatigue calculations have been carried out for Ti-6A1-4V, cobalt-chromium alloy materials and bone cement based on Goodman, Soderberg, and Gerber fatigue theories. All calculations have been performed according to the infinite fatigue life criteria. The results obtained have been compared and concluded to the results found by Charnley.

Evaluation of handling results of various materials using a non‐contact end‐effector

A non‐contact end‐effector was applied to lift three different materials which have different physical properties. These materials are mica (as rigid material), carton (as semi‐rigid material) and non‐rigid material (woven fabric). This end‐effector operates on the principle of generating a high‐speed air flow between nozzles and the specimen surface thereby creating a vacuum which levitates the materials with no mechanical contact. In this paper, the handling results of these materials are compared with each other. The changes in the physical behavior of lifting materials were observed during the experimental work. The effect of the various air flow rates on the non‐contact handling clearance gap between the nozzle and the materials were also investigated. As a result, it was observed that the non‐contact end‐effector could be applied to handle different flat materials.

A non-contact end-effector for the handling of garments

In order to handle a material with either a delicate surface or an air permeable structure, a novel nozzle was designed and developed. This nozzle utilises the phenomena of the radial air outflow. It is envisaged that this new nozzle will handle materials by eliminating surface marking and air permeable structure problems.

Computer-assisted robotic tiling of mosaics

This paper describes the development of a system that is capable of tiling mosaics using a robot according to requirements of the individual customer. The art of mosaic, in one form or another, has been practiced manually for thousands of years. Modern developments in materials and production techniques could be found as evidence that mosaic is very much alive in the new millennium. It is very costly and also difficult to find skilful people to tile mosaic. Therefore a computer-assisted robotic system has been constructed and applied. To activate the system a particular algorithm has been developed and successfully applied on an available SCARA robot.

Robot assisted tiling of glass mosaics with image processing

Purpose – This paper describes a robotic system developed for tiling mosaics based on image processing according to customer expectations.Design/methodology/approach – Many varieties of mosaics art in different forms has been applied manually over centuries for art decorating. Although the mosaics material is cheap with immense decorative potential, the mosaics tiling process is difficult and costly skill to perform. Therefore, an image processing based robotic tiling system has been presented and applied in this study. An algorithm has been developed for converting the computer image to mosaic picture by using Borland C++ Builder 6.0 and successfully utilized on six degrees of freedom Ultimate Puma 500 type industrial robot for tiling glass mosaics to any plane.Findings – According to result of this study, it can be realized that the robots could be successfully utilized on decorating processes, e.g. tiling mosaics, for faster and flexible production.Originality/value – Presented robotic system allows th...