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high strain rate torsion testing

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Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003295
EISBN: 978-1-62708-176-4
... Abstract This article reviews the dynamic factors, experimental methods and setup, and result analysis of different types of high strain rate shear tests. These include high strain rate torsion testing, double-notch shear testing and punch loading, drop-weight compression shear testing, thick...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003293
EISBN: 978-1-62708-176-4
... to transmit the stress pulse to the test sample. These basic factors of the Hopkinson bar method and some specialized compression and tension tests are discussed in the article “High Strain Rate Tension and Compression Tests” in this section. An overview of shear test methods (other than the torsional...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003300
EISBN: 978-1-62708-176-4
... Kolsky bar with the torsional Kolsky bar. It includes information on the various application areas of torsional Kolsky bar: limitations on strain rate, low- and high-temperature testing, quasi-static and incremental strain-rate testing, and localization and shear-banding experiments. incident wave...
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 temperature history during the test. Fig. 8 Stress-strain curves for solid torsion specimens of 3.3% Si steel showing effect of gage-length-to-diameter ratio ( L / d ) on flow stress at high strain rates when adiabatic heating occurs. The flow curves are in terms of von Mises effective stress-strain...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009012
EISBN: 978-1-62708-185-6
... This section illustrates the use of hot torsion testing for optimization of hot working processes. Billets of an experimental aluminum alloy have been homogenized by a conservative temperature-time schedule and are ready for trial processing. What temperature and strain rate should be used to maximize...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003269
EISBN: 978-1-62708-176-4
... and torsional testing at high strain rates, which are applicable for many deformation processes, also has some inherent advantages over high strain rate compression and tension tests (see the article “High Strain Rate Shear Testing” in this Volume). This article briefly reviews common methods of shear...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003263
EISBN: 978-1-62708-176-4
... with a short gage length and a large gage diameter are required to achieve high values of shear strain and strain rate. Test Section The test section in most torsion testing machines consists of a pair of grips for attaching both ends of the specimen to the torsion machine and a furnace for heating...
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 limitations imposed by necking ( Ref 2 , 3 ). Because the strain rate is proportional to rotational speed, high strain rates are readily obtained ( Table 1 ). Moreover, friction has no effect on the test, as it does in compression testing. The stress state in torsion may represent the typical stress...
Image
Published: 01 January 2005
Fig. 42 (a) Fracture-strain data from type 304L austenitic stainless steel torsion tests and (b) estimated temperature changes during high-rate tests. Low-strain-rate ( ε ¯ ˙ = 0.01 s − 1 ) data are plotted versus the actual test temperature. High-strain-rate (10.0 s More
Image
Published: 01 January 2000
Fig. 20 Stress-strain curves for solid torsion specimens of 3.3% silicon steel showing effect of gage length to diameter ratio ( L / d ) on flow stress at high strain rates when adiabatic heating occurs. The flow curves are in terms of von Mises effective stress-strain ( σ - ε defined by σ More
Image
Published: 01 January 2005
Fig. 8 Stress-strain curves for solid torsion specimens of 3.3% Si steel showing effect of gage-length-to-diameter ratio ( L / d ) on flow stress at high strain rates when adiabatic heating occurs. The flow curves are in terms of von Mises effective stress-strain ( σ ¯ − ε More
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003290
EISBN: 978-1-62708-176-4
... compression testing bend testing torsion testing springs THE MAJORITY OF CREEP TESTING, as described in this Volume, uses a fixed load (or stress) at a constant temperature and measures the increase in strain as a function of time. However, materials may also creep under constraint with little...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003296
EISBN: 978-1-62708-176-4
... behavior of a material, alternate Hopkinson bar schemes were designed for loading samples in uniaxial tension ( Ref 14 , 19 , 20 ), torsion ( Ref 21 ), simultaneous torsion compression ( Ref 22 ), and simultaneous compression torsion ( Ref 23 ). High-strain-rate testing in a Hopkinson bar under...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001032
EISBN: 978-1-62708-161-0
... without the limitations imposed by necking ( Ref 3 ). Because the strain rate is proportional to rotational speed, high strain rates are easily obtained. Moreover, friction has no effect on the test, as it does in compression testing. The stress state in torsion may represent the typical stress...
Image
Published: 01 January 2005
Fig. 37 Variation of ductility with temperature for a high-oxygen Swedish iron tested in torsion at an effective strain rate of 0.5 s −1 . Source: Ref 114 More
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
... deformation finite-element modeling forgeability test fracture indentation test plane-strain compression test ring compression test strain strain rate stress tension test workability workability analysis workability tests WORKABILITY refers to the relative ease with which a metal can...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006930
EISBN: 978-1-62708-395-9
... is that the shear rate, shear strain, and shear stress are constant throughout the gap. This can be beneficial when steady state flow testing is being performed. However, sometimes there can be challenges when cone and plate geometry is used with high molecular weight materials because of the geometric requirements...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003294
EISBN: 978-1-62708-176-4
... Abstract This article reviews high strain rate compression and tension test methods with a focus on the general principles, advantages, and limitations of each test method. The compression test methods are cam plastometer test, drop tower compression test, the Hopkinson bar in compression...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006775
EISBN: 978-1-62708-295-2
..., a not-quite-linear correlation was found between the lower yield strength and the number of grains containing twins, leading to the argument that twinning initiates at the yield stress with no further increase in the number of twins. Note that this is different from twinning initiated due to high strain-rate...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003538
EISBN: 978-1-62708-180-1
... a hcp structure, just as there are differences in the stress necessary to cause cleavage. Deformation twinning does occur in materials having a bcc lattice, with twinning more likely at low temperature and elevated strain rates. (Strain rates commonly encountered in tensile testing of the order...