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magnetic field testing

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Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003233
EISBN: 978-1-62708-199-3
... magnetic flux at the surface of the inner race. (c) Probe scanning the surface Fig. 6 Effect of mechanical hardness on hysteresis loop data. (a) AISI 410 stainless steel. (b) SAE 4340 steel Abstract Magnetic field testing includes some widely used nondestructive evaluation methods to...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003228
EISBN: 978-1-62708-199-3
... Abstract This article reviews nondestructive testing (NDT) and inspection techniques, namely liquid penetrant, magnetic particle, ultrasonics, X-ray, eddy current, visual and radiography that are commonly used to detect and evaluate flaws or leaks in an engineering system. This article compares...
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
... discontinuities in the translucent material and any variations in material thickness. Magnetic-particle inspection (MPI) uses magnetic fields to locate surface and subsurface discontinuities in ferromagnetic materials. When the material or part to be tested is magnetized, discontinuities that generally...
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006016
EISBN: 978-1-62708-172-6
.... adhesion testing concrete dry film thickness field quality control greases hardness intercoat contamination lamination pinholes quality assurance quality documentation quality planning shop quality control surface preparation wood IT IS COMMON to encounter contract or specification...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003232
EISBN: 978-1-62708-199-3
... material or part being tested is magnetized, discontinuities that lie in a direction generally transverse to the direction of the magnetic field cause a leakage field to form at and above the surface of the part. The presence of the leakage field, and, therefore, the presence of the discontinuity, is...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006468
EISBN: 978-1-62708-190-0
... materials. It depends on the fact that when the material or part under test is magnetized, magnetic discontinuities that lie in a direction generally transverse to the direction of the magnetic field will cause a leakage field to be formed at and above the surface of the part. The presence of this leakage...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003229
EISBN: 978-1-62708-199-3
... a filament. The bombarded molecules lose an electron and become positively charged ions, which are electrostatically accelerated to a high velocity. Because the analyzer lies in a magnetic field perpendicular to the ion path, the ions travel distinct, curved paths according to their mass. The radii...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006289
EISBN: 978-1-62708-169-6
... meter The magnitude and phase of the voltage across the sensing coil with respect to the excitation current is the electrical impedance of the probe. An alternating current flowing through the excitation coil generates a time-varying magnetic field that induces a voltage across the sensing coil...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006479
EISBN: 978-1-62708-190-0
... International specifications applicable to nondestructive testing ASTM International designation Title ASTM E709 “Standard Guide for Magnetic Particle Testing” ASTM E1444 “Standard Practice for Magnetic Particle Testing” ASTM E165 “Standard Practice for Liquid Penetrant Examination for...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003026
EISBN: 978-1-62708-200-6
... of frequency over which important dielectric relaxations may take place. Testing techniques can be divided into two broad categories. The first category contains techniques used for low (<10 8 Hz) frequencies, in which the wavelength of the electric field is large compared to sample dimensions...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003028
EISBN: 978-1-62708-200-6
... an accelerated rate have been developed to help predict the reaction of a plastic material to weathering prior to its field use. These tests expose specimens to extreme conditions to accelerate the aging process so that long-term weathering effects can be estimated in a shorter, more useful time...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003057
EISBN: 978-1-62708-200-6
... to the diverse and specialized nature of applications for advanced ceramic materials, a multitude of specific tests have been developed by workers in the field. This fact makes it difficult to develop meaningful comparisons among laboratories and existing experimental data. The number of different...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006761
EISBN: 978-1-62708-295-2
... values in the field on samples that are too large or too integral in a system to bring into the laboratory. Although the versatility of hardness testing makes it one of the most used tools in the analyst’s arsenal, it is often one of the most misused tests performed. Understanding the limitations of...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.9781627081764
EISBN: 978-1-62708-176-4
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006478
EISBN: 978-1-62708-190-0
... section describes NDE methods commonly used for (MMCs). Defects and anomalies are generated unintentionally during two different situations: the manufacturing and the service life of the composite. Table 7 lists the possible defects in MMCs ( Ref 110 ). Table 8 lists some nondestructive testing...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003241
EISBN: 978-1-62708-199-3
... numerous production operations in addition to its use in research applications. Specific fields of application of microhardness testing include: Measuring hardness of precision workpieces that are too small to be measured by the more common hardness-testing methods Measuring hardness of product...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003154
EISBN: 978-1-62708-199-3
... Abstract Premanent magnet refers to solid materials that have sufficiently high resistance to demagnetizing fields and sufficiently high magnetic flux output to provide useful and stable magnetic fields. Permanent magnet materials include a variety of alloys, intermetallics, and ceramics. This...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006476
EISBN: 978-1-62708-190-0
..., amplification, and processing of the incoming MBN signal. Sensors are designed to apply an alternating magnetic field to the sample under test to elicit MBN emissions. Magnetic Barkhausen noise is measured with a pickup coil. The magnetizing unit and the pickup coil are often bundled together into the same...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006442
EISBN: 978-1-62708-190-0
... Abstract This article discusses the principles and limitations of micromagnetic techniques, namely, magnetic Barkhausen noise (MBN) and magnetoacoustic emission (MAE). It also discusses various factors limiting the establishment of acceptance criteria for test components as they pertain to the...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006753
EISBN: 978-1-62708-295-2
... economy are well documented. For example, the importance of investigating failures was vividly illustrated in the pioneering efforts of the Wright Brothers in developing self-propelled flight. In fact, while Wilbur was traveling in France in 1908, Orville was conducting flight tests for the U.S. Army...