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torsional deformation

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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
... Fig. 1 Torsion of a solid circular prismatic section Fig. 3 Torque-twist curves Fig. 2 Section through prismatic bar of circular section Fig. 4 Geometry of deformation for the plastic straining of a hollow cylinder. γ, shear strain; L , initial length of cylinder...
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
... reorientation (in torsion). Therefore, a large amount of deformation can be achieved before fracture occurs. The stress state can be varied over wide limits by controlling the barreling of the specimen through variations in geometry and by reducing friction between the specimen ends and the anvil...
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
... for deformation and fracture. Next, the mechanisms of void nucleation and void coalescence are briefly described. Macroscale and microscale appearances of ductile and brittle fracture are then discussed for various specimen geometries (smooth cylindrical and prismatic) and loading conditions (e.g., tension...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003258
EISBN: 978-1-62708-176-4
... tensile stress component at the centerline of the workpiece during plastic deformation. Another example of the importance of the state of stress is the favorable influence that normal compressive stress has on the maximum shear strain before fracture. Note ( Fig. 3 ) that for torsion testing on steels...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005181
EISBN: 978-1-62708-186-3
... compression testing plane-stress deformation strain rate tension testing torsion testing Effective stress, strain, and strain rate (isotropic material) in arbitrary coordinates Table 1 Effective stress, strain, and strain rate (isotropic material) in arbitrary coordinates Variable or quantity...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005508
EISBN: 978-1-62708-197-9
... ¯ = γ / 3 Forming processes such as hot or cold rolling that are carried out at high rates of deformation necessitate flow stress data at high strain rates. For this purpose, the split-Hopkinson pressure bar is used for compression tests (as well as tension or torsion tests) at high strain...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003742
EISBN: 978-1-62708-177-1
...). At the top of figure is a tracing of the underlying and adjacent micrograph. Long GNBs are nearly parallel to the main {111} slip plane. A grain boundary (GB) runs diagonally. Source: Ref 12 . (c) Nickel (99.99%) deformed by torsion at 296 K and a strain rate of 10 −4 s −1 , ε vM = 0.35. Source: Ref 13...
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: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000606
EISBN: 978-1-62708-181-8
... in equal parts of hydrochloric acid and water to reveal deformation flow and forging flash lines. The plastic deformation is characteristic of torsional overload in ductile metals and is not typical of rotating fatigue. Figure 190 is a higher-magnification view (2×) of the threaded portion...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005556
EISBN: 978-1-62708-174-0
..., there is no constraint, other than, perhaps, the relatively minor constraint associated with plastic strain incompatibilities between the interlayer and the base metal. It was also mentioned earlier that the equivalent uniaxial strain-to-failure for torsional deformation of soft-interlayer joints is roughly 4 orders...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001352
EISBN: 978-1-62708-173-3
... of the interlayer, there is not constraint, other than, perhaps, the relatively minor constraint associated with plastic strain incompatibilities between the interlayer and the base metal. It was also mentioned earlier that the equivalent uniaxial strain-to-failure for torsional deformation of soft-interlayer...
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
... data Test temperature Deformation mode Strain at fracture (torsional shear or tensile), γ sf or ε ¯ f Strength coefficient, G or K Strain-hardening exponent, n Average correction factor, ⟨CF⟩ C parameter °C °F MPa ksi MPa ksi 20 68 Torsion 4.01 517 75...
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
... deformed by hot torsion at various temperatures Fig. 10 Alloy purity and strain-rate effects on equivalent tensile strain to failure for the second homogenization step of 8 h at different temperatures following a first homogenization of 427 °C (800 °F) for 16 h Fig. 1 Typical torsion...
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
... shear deformation band in tungsten alloy W90 Fig. 3 Cross section of torsional impact machine. Source: Ref 4 Fig. 21 The basic experimental setup for explosion-driven collapse of a metallic sample Fig. 1 Dynamic hydraulic torsion test facility. Source: Ref 1 Fig...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005418
EISBN: 978-1-62708-196-2
... > || rolling direction) is softest at the end of rolling ( Ref 21 ). Deformation textures observed due to torsion deformation at both room temperature and at 264 °C in fcc nickel and nickel-cobalt alloys of varying stacking fault energy (SFE) have also been modeled using the VPSC approach ( Ref 22 ) ( Fig...
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
...Abstract Abstract This article provides a description of the microscale models and mechanisms for deformation and fracture. Macroscale and microscale appearances of ductile and brittle fracture are discussed for various specimen geometries and loading conditions. The article reviews the general...
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
.... The specimen is loaded by a torsional wave that is generated in one of the bars. Once loaded, the wave is partially reflected back and partially transmitted to the other bar. The history of load and deformation in the specimen is determined by monitoring the waves in the bars, which remain elastic throughout...
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
... son, Bertram Hopkinson. Based on these contributions and also on an important paper by R.M. Davies, H. Kolsky invented the split-Hopkinson pressure bar, which allows the deformation of a sample of a ductile material at a high strain rate, while maintaining a uniform uniaxial state of stress within...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003389
EISBN: 978-1-62708-195-5
....) and the solution control parameters. Obtain the deformation patterns, strains, and stresses at various locations in the structure and evaluate the ultimate load-carrying capacity of the structure. While all the above steps are common to the analysis of both the metallic as well as composite structures...
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
... and torsion tests have somewhat limited utility; specialized tests more closely simulate the deformation experienced in actual bulk forming processes and may give better indications of formability. BULK FORMABILITY, also known as workability, refers to the relative ease with which a metal can be shaped...