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extensometers

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Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001366
EISBN: 978-1-62708-215-0
... Mechanical Properties Ultimate tensile strength determined on a sub-size specimen excised from the impeller was 475 MPa (69 ksi); the specification requirement is 483 MPa (70 ksi) minimum. The small size of the test specimen precluded the use of extensometers; therefore, accurate and valid measurements...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006928
EISBN: 978-1-62708-395-9
.... The degree of precision that could be attained using a handheld scale behind a piece of rubber being stretched at a speed of more than 8 mm/s (0.3 in./s) was always open to question, with 10% being an optimistic estimate. More recent technology employs extensometers, which comprise pairs of very light...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
... manufacturers, and high-temperature extensometers can readily be constructed in the lab or purchased commercially. Control Logic The temperature signal is processed and used as the command signal for the strain-control channel to produce a desired strain-temperature profile. However, it is customary...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... being tested couples to RF energy. High-quality closed-loop test equipment is available from several manufacturers, and high-temperature extensometers can readily be constructed in the lab or purchased commercially. Control Logic The temperature signal is processed and used as the command signal...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003544
EISBN: 978-1-62708-180-1
... for strain-life data is not as straightforward as the simple load-controlled (stress-controlled) S - N testing. Monitoring and controlling using strain requires continuous extensometer capability. In addition, the developments of the technique may make it necessary to determine certain other...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006829
EISBN: 978-1-62708-295-2
... displacement results in a tangential force, Q (amplitude Q * ). The measured displacement, δ m , is obtained from an external extensometer (linear variable differential transformer, laser, etc.), while the loading and tangential forces ( P and Q ) are recorded from load cells. Fig. 7 Schematic...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006819
EISBN: 978-1-62708-329-4
... between small inelastic strains and the safe stress in fatigue using a mirror extensometer with sufficient sensitivity to measure one microstrain ( Ref 6 ). Later, in 1903, Ewing and Humphrey, motivated by the earlier work of Wohler and Bauschinger, published their classic paper titled “The Fracture...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006779
EISBN: 978-1-62708-295-2
... more complex and time- and cost-consuming than load-controlled (stress-controlled) S - N testing. For example, monitoring and controlling the strain requires servohydraulic or electromechanical testing equipment, continuous extensometer measurements, and a relatively low testing frequency. Further...