Effects of magnetic flux density and tensile stress on the magnetic Barkhausen noise in pipeline steel

1996 ◽  
Vol 29 (5) ◽  
pp. 335
Keyword(s):  
Magnetic Flux ◽  
Tensile Stress ◽  
Flux Density ◽  
Pipeline Steel ◽  
Magnetic Flux Density ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise

Investigation of Strain Sensing Properties of Polyester/Magnetite Composite Materials

2013 ◽  
Vol 543 ◽  
pp. 464-467 ◽  
Author(s):  
Sotiria Karagiovanaki ◽  
Loukas Zoumpoulakis
Keyword(s):  
Composite Materials ◽  
Magnetic Flux ◽  
Tensile Stress ◽  
Flux Density ◽  
Precipitation Method ◽  
Magnetic Flux Density ◽  
Magnetic Composite ◽  
Strain Sensing ◽  
Sensing Properties ◽  
Co Precipitation

The aim of this work is to investigate the strain sensing properties of polyester/magnetite composite materials of different contents 5, 10, 15, 20% w/w. Specifically, we manufactured magnetic composite materials with a polyester matrix (thermosetting polymer) and nanoparticles of magnetite (Fe3O4) as additives, processed by molding technique. For these composites we used two different magnetite powders of grain sizes a) 20-30nm (premade from Alfa Aesar) and b) <1 μm (powder made by the co-precipitation method in our laboratory). The specimens were subjected into tensile stress in order to observe the alternation of Reluctance induced by strain. The sensing probe is consisted of an electromagnet and a Hall sensor (magnetic flux density sensor). The electromagnets coil is supplied by direct current (DC) causing magnetic flux to circulate the core of the specimen. The results from the tensile stress experiments show that the magnetic flux density B decreases analogous to the Strain.

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