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alternating current impedance measurement

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Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006764
EISBN: 978-1-62708-295-2
... material. Coil impedance changes in relationship with cracks, inclusions, etc., affecting induced eddy currents in the material. Material identification, crack detection/sizing to 1–2 mm (0.04–0.08 in.), erosion, corrosion, pitting, wall thinning on thin-wall material, surface profiling Absolute measure...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001769
EISBN: 978-1-62708-241-9
... also used for the impedance studies. Impedance studies were carried out using a computer control system. After a steady state was attained, an AC signal of 10 mV amplitude was applied, and the impedance values were measured for frequencies ranging from 0.1 Hz to 100 kHz. The values of R t were...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006758
EISBN: 978-1-62708-295-2
... including a pie gage which aids in determining the orientation of the magnetic fields. NDE methods such as eddy-current test (ET) or ultrasonic testing (UT) may provide the screen output near an indication that shows the signal response of a flaw. Figure 4 shows the impedance output used...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003524
EISBN: 978-1-62708-180-1
... an alternating current is placed around or near the surface of the sample, it will set up eddy currents within the material by electromagnetic induction. These eddy currents affect the impedance in the exciting coil or any other pickup coil that is nearby. Cracks or flaws within the sample will cause distortions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001396
EISBN: 978-1-62708-229-7
... equipment should be prevented from entering the boiler itself. Also, it is good practice to reduce as far as possible the intrusion of weld flash and other impedances to smooth flow within the boiler tubes. Boiler tubes Corrosion products Magnetite Boiler tube steel High-temperature corrosion...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003549
EISBN: 978-1-62708-180-1
... methods for electrochemical testing are published in Ref 2 . As the name suggests, in the controlled-current test method, the current is controlled and the resulting corrosion potential is measured. Polarization curves are generated. Galvanostatic and galvanodynamic polarization measurements are used...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003556
EISBN: 978-1-62708-180-1
... exposed to a common electrolyte. Where anodes and cathodes frequently change location, general corrosion is seen, but when the anode becomes focused in one location, pitting results. In pitting, the rate of penetration is, to a large measure, a function of the relative size of the cathodic and anodic...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006782
EISBN: 978-1-62708-295-2
...-current testing, current is controlled, the resulting corrosion potential is measured, and polarization curves are generated. Galvanostatic and galvanodynamic polarization measurements are used to plot anodic and cathodic polarization curves. The assumption that corrosion rates remain constant with time...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003519
EISBN: 978-1-62708-180-1
... glass Use to look at samples. Loop is higher magnification, 10–25×. Lower-power magnifying glass can also be helpful Tape measure Measure long distances Indelible ink marker (fine) Mark items, bags, bottles Flashlight Look at items in holes, dark areas, etc.. Good to have 90° bend...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006778
EISBN: 978-1-62708-295-2
... of the material from damage, embrittlement, or other factors. However, the definition of overload failure is not uniformly agreed upon. Many engineers limit the definition of overload failures to those in which the applied stresses were higher than anticipated in design. This alternate viewpoint incorrectly...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
...–30 CaSO 4 , mol% 24 41–67 18–42 15–30 (a) Assumes that all measured Na + , K + , Mg 2+ , and Ca 2+ in particulate matter are present in the form of sulfate. Courtesy of Z. Tang and B. Gleeson, University of Pittsburgh Fig. 24 Distribution of particulate matter (PM) around...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006755
EISBN: 978-1-62708-295-2
... research Construct a hypothesis regarding each root cause Test each hypothesis with an experiment (test, inspection, etc.): A systematic and coordinated collection of measurements and observations Use a control sample Record and analyze the data Document, archive, and share the results...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003543
EISBN: 978-1-62708-180-1
... determined that a nonapproved lubricant was added to the questioned fastener lot during installation. In fastener design where tension preload is controlled by torque measurement, the general relationship T  =  KDP is often used, where T is torque, K is a torque coefficient including a friction...