ORALS

SESSION: ManufacturingMonPM2-R4 Precision / Ultraprecision Manufacturing	Mamalis International Symposium on Advanced Manufacturing of Advanced Materials and Structures with Sustainable Industrial Applications
Mon Nov, 5 2018 / Room: Sao Conrado (50/2nd)
Session Chairs: Tatsuo Sawada; Session Monitor: TBA

16:45: [ManufacturingMonPM211]
A Simple Magnetic Susceptibility Measuring Technique
Giorgios Banis¹ ; Panayiota Tselou¹ ; Angelo Ferraro¹ ; Evangelos Hristoforou¹ ; Athanasios G. Mamalis² ; ¹National TU of Athens, Athens, Greece; ²PC-NAE, Demokritos National Center for Scientific Research, Athens, Greece;
Paper Id: 295 [Abstract]

A simple apparatus able to measure the magnetic susceptibility of spherical samples is demonstrated. The method is based on the equilibrium of the magnetic force applied on the specimen from a coil, and of the Stoke's force applied on the specimen by the flow of a liquid. Acquiring basic materials (coil, tube, power supply), we measured with sufficient accuracy the magnetic susceptibility of materials with unknown magnetic properties. Furthermore, by using a spherical specimen with given magnetic susceptibility, following the reverse methodology, it is possible to define the viscosity of the fluid. Thereby, we present a simple, low cost technique for fast and efficient measuring of specimens' magnetic susceptibility or viscosity of the liquid where the specimen is located.

SESSION: ManufacturingWedAM-R4 Transport / Crashworthiness of Vehicles: Passive and Active Safety	Mamalis International Symposium on Advanced Manufacturing of Advanced Materials and Structures with Sustainable Industrial Applications
Wed Nov, 7 2018 / Room: Sao Conrado (50/2nd)
Session Chairs: Ryuichi Tomoshige; Session Monitor: TBA

12:35: [ManufacturingWedAM04]
Magnetic Permeability Measurement Device Based on Hall Effect
Spyridon Angelopoulos¹ ; Giorgios Banis¹ ; Xenia Vourna¹ ; Aphrodite Ktena² ; Panagiotis Tsarabaris¹ ; Evangelos Hristoforou¹ ; Athanasios G. Mamalis³ ; ¹National TU of Athens, Athens, Greece; ²TEI of Chalkida, Chalcis, Greece; ³PC-NAE, Demokritos National Center for Scientific Research, Athens, Greece;
Paper Id: 296 [Abstract]

A new, fully portable device is presented, which can be used to measure magnetic permeability and residual stress. The device is based on the use of a Hall sensor and a permanent magnet. The Hall sensor is placed at the edge of a yoke, and consists of two parallel ferromagnetic bars and a permanent magnet. As a result, its output voltage depends on the magnetic field that is produced by the magnet. If the yoke is placed near a ferromagnetic material under test, the Hall voltage output will change accordingly. The optimal placement of the Hall sensor was found through software simulations. The magnetic field measured by the Hall sensor can be correlated to the surface magnetic permeability and the residual stress tensor distribution of the ferromagnetic material under test. Calibration of the sensor was held, in order to provide accurate results. The constructed device includes the aforementioned sensing element, an Arduino-based microcontroller, an RF transmitter, a Bluetooth module, and a battery. The collected data is wirelessly transmitted to a receiving device, and consists of an Arduino-based microcontroller, an RF receiver, an LCD, and a battery. As a result, the output information can be viewed either on the dedicated device or on any other Bluetooth-compatible device (e.g. smartphone or tablet). The sensor is suitable for on-field measurements, as it is wireless, energy sufficient, robust, and conducts high-speed contactless measurements.