EFFECT OF HOMOGENIZATION ANNEALING AND HYDROXYAPATITE COATING USING EDP TECHNIQUE ON MAGNESIUM ALLOY FOR ORTHOPEDIC APPLICATIONS
Published In: 8TH INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): SADIQ TAOHEED OLOHUNDE , IDRIS JAMALIAH , MOHAMAD IMRAN , MOHD ZAMANI AHMAD
Abstract: This study was aimed at improving the degradation rate and bioactivity of magnesium alloy by homogenization annealing and hydroxyapatite coating via electrophoretic approach. Hydroxyapatite was synthesized using co-precipitation method and deposited on mechanical treated and homogenized magnesium alloy. The characterization was done using optical microscope (OP), scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive spectroscope (EDS), Fourier transform infrared spectroscope (FTIR). Homogeneous solution of hydroxy suspension was obtained by performing zeta potential measurement, and in-vitro bioactivity evaluation will be carried out in stimulated body fluid for 28 days. It is our expectation that a significant improvement would be recorded in controlling the degradation rate and in vitro evaluation of this alloy.
- Publication Date: 24-Apr-2019
- DOI: 10.15224/978-1-63248-170-2-12
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HELICOPTER TAIL ROTOR DRIVESHAFT DESIGN USING SHAPE MEMORY ALLOY (SMA)
Published In: 8TH INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): ABHIJEET SAXENA , SAHIL SINGH MALIK , KSHITIJ GUPTA
Abstract: This paper focuses on design alternatives of a helicopter tail rotor driveshaft utilizing shape memory alloy (SMA). The conventional tail rotor designs segment the complete shaft into multiple shafts due to its long length which would have low bending natural frequencies. Using multi-segmented shafts introduce multiple in-span bearings and flexible couplings to accommodate misalignment due to manufacturing. This leads to a heavy and maintenance-intensive design. The paper explores the application of Shape Memory Alloy (SMA) and ways it can be introduced in the driveline system to reduce its weight. The proposed design alternatives aim to reduce the number of segments of shaft which leads to lesser number of in-span bearings and flexible couplings. However, the natural frequencies of the system decrease, which may lead to supercritical operation of the driveline. The underlying design ideas have been presented with a specific example of a tail rotor driveline.
- Publication Date: 24-Apr-2019
- DOI: 10.15224/978-1-63248-170-2-13
- Views: 0
- Downloads: 0