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servohydraulic machines

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Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009010
EISBN: 978-1-62708-185-6
... versatility in materials testing. Universal testing machines and tension-test frames can be used for hot-tension tests by attaching a heating system to the machine frame. The frame may impart loading by either a screwdriven mechanism or servohydraulic actuator. Screw-driven (or gear-driven) machines...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009009
EISBN: 978-1-62708-185-6
... carried out in a servohydraulic machine such as that shown schematically in Fig. 1 . Because strain-rate effects are large in high-temperature testing, it is important to use an apparatus with high machine stiffness. The furnace that surrounds the specimen is usually of resistance, radiant-heating, or...
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
... can be attained by the Brinell hardness test can be greatly influenced by the surface smoothness of the workpiece being tested. The surface of the workpiece on which the Brinell indentation is to be made must be filed, ground, machined, or polished with emery paper (3/0 emery paper is suitable) so...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009007
EISBN: 978-1-62708-185-6
..., the determination of flow stress in compression is carried out under isothermal conditions (no die chilling) at a constant strain rate and with a minimum of friction in order to minimize barreling. These conditions can be met with conventional servohydraulic testing machines. For an essentially...
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
... should be evaluated and verified experimentally. Tests under variable-amplitude loading should be conducted with servohydraulic or electromechanical testing equipment on component-like structures under the real loading history. Alternative tests with simplified block programs are conducted as well, but...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009011
EISBN: 978-1-62708-185-6
... the torsion test ( Fig. 71 – 74 ) has been used to provide insight into how equipment requirements and final microstructures can be determined by this technique. In this instance, torsion tests were conducted in a servohydraulic test machine at a fixed strain rate. However, temperature was controlled...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
..., further reductions in friction and wear are obtained ( Ref 176 ). Furthermore, machine components and forming oils also contain additives rich in sulfur, phosphorus, or chlorine, which can form sulfide, phosphide, or chloride protective films on metallic surfaces ( Ref 13 ). These films are intended to...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004017
EISBN: 978-1-62708-185-6
... =0.8 and ε ˙ =0.01 s −1 . Source: Ref 6 Another way to deal with barreling in the compression test is to physically remove it by machining at intervals of strain. Fig. 5 shows the true compressive stress-strain curve for a 4140 alloy steel specimen. The specimen was compressed about...
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
... the damage accumulation and life-estimation scheme employed accounts for the underlying physics of each damage mechanism as well as their interactions. The basic equipment required is a low thermal mass programmable furnace, a closed-loop servohydraulic mechanical test machine, and suitable...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005654
EISBN: 978-1-62708-198-6