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1 – 3 of 3Burak Öztürk and Fehmi Erzincanli
This study aims to design a femoral component with minimum volume and maximum safety coefficient. Total knee prosthesis is a well-established therapy in arthroplasty applications…
Abstract
Purpose
This study aims to design a femoral component with minimum volume and maximum safety coefficient. Total knee prosthesis is a well-established therapy in arthroplasty applications. And in particular, with respect to damaged or weakened cartilage, new prostheses are being manufactured from bio-materials which are compatible with the human body to replace these damages. A new universal method (design method requiring optimum volume and safety [DMROVAS]) was propounded to find the optimum design parameters of tibial component.
Design/methodology/approach
The design montage was analyzed via the finite element method (FEM). To ensure the stability of the prosthesis, the maximum stress angle and magnitude of the force on the knee were taken into consideration. In the analysis process, results revealed two different maximum stress areas which were supported by case reports in the literature. Variations of maximum stress, safety factor and weight were revealed by FEM analysis, and ANOVA was used to determine the F force percentage for each of the design parameters.
Findings
Optimal design parameter levels were chosen for the individual’s minimum weight. Stress maps were constructed to optimize design choices that enabled further enhancement of the design models. The safety factor variation (SFV) of 5.73 was obtained for the volume of 39,219 mL for a region which had maximum stress. At the same time, for a maximum SFV and at the same time an average weight, values of 37,308 mL and 5.8 for volume and SFV were attained, respectively, using statistical methods.
Originality/value
This proposed optimal design development method is new and one that can be used for many biomechanical products and universal industrial designs.
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This paper aims to examine the performance of the machining parameters used in the hard-turning process of DIN 1.2738 mold steel and identify the optimum machining conditions.
Abstract
Purpose
This paper aims to examine the performance of the machining parameters used in the hard-turning process of DIN 1.2738 mold steel and identify the optimum machining conditions.
Design/methodology/approach
Experiments were carried out via the Taguchi L18 orthogonal array. The evaluation of the experimental results was based on the signal/noise ratio. The effect levels of the control factors on the surface roughness and flank wear were specified with analysis of variance performed. Two different multiple regression analyses (linear and quadratic) were conducted for the experimental results. A higher correlation coefficient (R2) was obtained with the quadratic regression model, which showed values of 0.97 and 0.95 for Ra and Vb, respectively.
Findings
The experimental results indicated that generally better results were obtained with the TiAlN-coated tools, in respect to both surface roughness and flank wear. The Taguchi analysis found the optimum results for surface roughness to be with the cutting tools of coated carbide using physical vapor deposition (PVD), a cutting speed of 160 m/min and a feed rate of 0.1 mm/rev, and for flank wear, with cutting tools of coated carbide using PVD, a cutting speed of 80 m/min and a feed rate of 0.1 mm/rev. The results of calculations and confirmation tests for Ra were 0.595 and 0.570 µm, respectively, and for the Vb, 0.0244 and 0.0256 mm, respectively. Developed quadratic regression models demonstrated a very good relationship.
Originality/value
Optimal parameters for both Ra and Vb were obtained with the TiAlN-coated tool using PVD. Finally, confirmation tests were performed and showed that the optimization had been successfully implemented.
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Despite developments in the fields of technology and health, some people may still have congenital or acquired disabilities. In our world, where one in every seven consumers is…
Abstract
Despite developments in the fields of technology and health, some people may still have congenital or acquired disabilities. In our world, where one in every seven consumers is disabled, these consumers also have the right to utilize the services offered to them in the best way as the other six. With the developed technology and innovations, it has become easier and more inexpensive for disabled consumers to access products and services. The number of disabled consumers is also increasing day by day in the tourism sector. However, the designs of touristic products are not suitable for every type of disability. The concept in disabled tourism that is known as “Quiet Tourism” in the literature represents the group including consumers with hearing and speech loss. This section aims to present consumers with hearing and speech loss who have to continue their lives this way becoming a new market for accommodation firms and what types of difficulties and opportunities may be encountered. It is aimed to show that the existing infrastructure at accommodation firms is not adequate, but there is a considerable potential.
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