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hot torsion testing

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0091096
EISBN: 978-1-62708-234-1
... to an expensive gear mechanism. The rotor was subjected to severe chatter, which was an abnormal condition resulting from a series of continuous small overloads occurring at a frequency of around three per second. Investigation (visual inspection, hardness testing, and hot acid etch images) supported...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001808
EISBN: 978-1-62708-180-1
... changed. The distortion will be obvious if there were axial grooves or lines on the shaft before twisting, or if the metal is hot etched to reveal grain-flow twisting. If a shaft loaded in torsion is assumed to consist of an infinite number of infinitely thin disks that slip slightly with respect to each...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006810
EISBN: 978-1-62708-329-4
... Mechanical Testing and Chemical Analysis Stress Systems Acting on Shafts Tension Torsion Compression Discussion Abrasive Wear Example 3: Wear Failure of a Fuel-Pump Drive Shaft Caused by the Presence of Sand, Metallic Particles, and Vibration Conclusions Recommendations Example...
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
... orientation Surface condition Stress concentration Environment (temperature, corrosion) Type of loading (axial, bending, torsion) Test-controlling parameter (load, displacement, strain) Frequency and waveform Mean stress ( R -ratio) Type of stress for evaluation (nominal or local...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006836
EISBN: 978-1-62708-329-4
... to investigate changes in the spring design to increase the margin in fatigue. Options that reduce the torsional shear stress for a given displacement can be explored. The current springs will not pass the reliability test based on the fatigue performance criteria when computer modeling is used. If the design...
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
... the effects of load frequency and temperature, material condition, and manufacturing practices on fatigue strength. It provides information on subsurface discontinuities, including gas porosity, inclusions, and internal bursts as well as on corrosion fatigue testing to measure rates of fatigue-crack...
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
... pattern on a ductile torsion surface is a strong indicator of that loading.) If the fracture surface is quite rough, as is common in combinations of ferrite and pearlite in hot rolled or annealed steels, the points of contact may be smeared, but there are often regions below the rubbed surface that can...
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
... swirl rubbing pattern on a ductile torsion surface is a strong indicator of that loading.) If the fracture surface is quite rough, as is common in combinations of ferrite and pearlite in hot-rolled or annealed steels, the points of contact may be smeared, but there are often regions below the rubbed...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001822
EISBN: 978-1-62708-180-1
... a critical amount of plastic strain was introduced in the HAZ. It is well recognized that copper, as well as certain other elements in steel, can detrimentally influence hot workability ( Ref 42 , 43 , 44 , 45 , 46 ). These studies have generally employed hot-torsion, bend, or cupping tests to assess...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001813
EISBN: 978-1-62708-180-1
... of failures of springs that occur solely as the result of faulty design is comparatively small. However, there are occasional exceptions. For example, one of a test set of titanium alloy Ti-13V-11Cr-3Al torsionally stressed compression springs failed by fatigue after 12 × 10 6 cycles at a maximum stress...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006767
EISBN: 978-1-62708-295-2
... are functions of their position on the cut surface. The possibility that the stresses σ and τ are functions of position on the surface must also be permitted (as in the stress field around a stress concentrator or a stress state in bending or torsion). In addition, if the surface is cut in a different...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001811
EISBN: 978-1-62708-180-1
... is such an important factor in wire-rope life that many laboratory bending or fatigue tests have been conducted to evaluate this relationship. Laboratory bending life can be determined; however, field service life can seldom be judged by these results. There are too many factors existing under actual field conditions...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001377
EISBN: 978-1-62708-215-0
... Intergranular fracture Stress-corrosion cracking Background Visual Examination of General Physical Features Testing Procedures and Results Conclusion and Recommendations Acknowledgments References References 1. DIN 267, Part 3, German Standards Association , October 1967 2...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c9001578
EISBN: 978-1-62708-233-4
... case when the pump was operated. Torsional testing generally is performed using either one of two methods. The first is the use of a strain gage to measure the alternating torsional strain. The second method involves measuring the change in the passing frequency of equally spaced gear teeth...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003530
EISBN: 978-1-62708-180-1
... and τ are functions of position on the surface must also be permitted (as in the stress field around a stress concentrator or a stress state in bending or torsion). In addition, if the surface is cut in a different orientation, the forces are different and the stresses are different as well. Therefore...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006760
EISBN: 978-1-62708-295-2
... to determine the physical cause of the problem. If the results of the different tests point toward the same sequence of damage, the investigation may be deemed a success. If there are conflicting damage scenario possibilities provided by different tests, then the situation must be explained. Sometimes...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006820
EISBN: 978-1-62708-329-4
... and Fracture Mechanics , Vol 30 , STP 1360, Paris P.C. and Jerina K.L. , Ed., American Society for Testing and Materials , West Conshohocken, PA , 2000 • Muller J. and Errichello R. , How to Inspect a Gearbox , Mach. Lubr. Mag. , Noria Corporation , Tulsa, OK , Feb...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006776
EISBN: 978-1-62708-295-2
.... Source: Ref 15 Fig. 16 Characteristic X-pattern on the surface of a medium-carbon steel crankshaft tested under reversed torsional fatigue. Fatigue initiated on a transverse plane of maximum shear, then propagated on two pair of helical surfaces. Source: Ref 11 Fig. 17 Torsional...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003539
EISBN: 978-1-62708-180-1
... crankshaft tested under reversed torsional fatigue. Fatigue initiated on a transverse plane of maximum shear, then propagated on two pair of helical surfaces. Source: Ref 11 Fig. 17 Torsional fatigue failure of boron-containing alloy steel helical spring. Fatigue initiated at an abraded area...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006830
EISBN: 978-1-62708-329-4
... to suppliers for repair and proof testing. Embrittlement of the chain link due to process upsets Regular inspection of chains is imperative. Where many chains are in service, inspection can be done visually. For safety-critical applications, magnetic-particle or liquid penetrant inspection should...