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torsion fatigue strength

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001810
EISBN: 978-1-62708-241-9
..., the shoulder radius should be increased to alleviate stress and the working torsion angle of the bar should be decreased to improve safety factors. rotary shaft torsional fracture stress concentration spring steel fracture torsional stress calculation torsion fatigue strength 50CrV4 (chromium...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001091
EISBN: 978-1-62708-214-3
... indicated that the mechanism of fracture initiation was torsional fatigue. Intermittent deceleration and acceleration resulting from power surges during operation of the turbine caused torsional vibration and was considered the most probable source of the required cyclic stress. Final failure took place...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001759
EISBN: 978-1-62708-241-9
... to withstand push-out load of 885 kg. Push-Out Load Test Results for Nitrided Samples The bearing cup tested by push-out load test and was found to withstand push-out load of 1015 kg. Endurance Test To check the torsional fatigue strength of drive shaft assembly and to compare the performances...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001792
EISBN: 978-1-62708-241-9
... that rotational bending stresses caused the gear shaft to fail due to insufficient fatigue strength. This led to the torsional failure of the corroded clutch shaft, which was subjected to a sudden, high level load when the shaft connecting the gearbox to the propeller failed. power transmission shafts...
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
... groove in the shaft had performed its function, but at a lower overload level than intended. Recommendations included increasing the fatigue strength of the shaft by shot peening the shear groove to minimize chatter. Shafts (power) Shot peening Torsional fatigue 4340 UNS G43400 Fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001763
EISBN: 978-1-62708-241-9
... fatigue fracture transient torsional overloading medium carbon steel spline teeth deformation stress analysis fracture toughness SAE/AISI 1045 (medium-carbon alloy steel) UNS G10450 Introduction All-terrain vehicles (ATVs) can be considered fourwheeled motorcycles for off-road operation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001468
EISBN: 978-1-62708-221-1
... of an ultimate tensile strength of 38 t.p.s.i. The cracking which developed was characteristic of that resulting from torsional fatigue, and since it occurred on two different planes at 45° to the axis of the shaft it was due to reversals of torsional stress rather than fluctuations of unidirectional torque...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0048039
EISBN: 978-1-62708-219-8
... was found to have promoted fracture due to increased magnitude of stresses. Mechanical damage to surfaces of wires was concluded to be sufficient to cause fatigue cracking under the stresses encountered in service. Cyclic loads Tensile stress Torsion Steel wire rope Ductile fracture Fatigue...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001230
EISBN: 978-1-62708-236-5
... the location at which the sum of the torsional stress (+) and residual compressive stress (−) first exceeded the fatigue strength. Fig. 5 Fracture edge of opened crack as seen from bearing surface. 3× Fig. 6 Fracture edge of opened crack as seen from bearing surface. 10× Fig. 7...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001153
EISBN: 978-1-62708-225-9
... to a state of internal stress which favored fracture of the spring. Shot blasting Torsional fatigue Valve springs Spring steel Surface treatment related failures Fatigue fracture The fatigue strength of parts which are subjected to reverse bending or torsional stresses can be considerably...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001733
EISBN: 978-1-62708-225-9
.... Magnification 55 times. Fig. 6 Typical torsion failure in production stranding or bunching of colddrawn filaments of high carbon steel. Magnification 480 and 600 times. Laboratory Fatigue Failure Laboratory fatigue tests were made with either a compression fatigue tester (buckling...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001192
EISBN: 978-1-62708-234-1
.... Probably the load was too high for the strength of the crank. Tensile strength could have been increased for the same material by tempering at lower temperature. Additionally the resistance against high bend fatigue stresses or torsion fatigue stresses could have been substantially increased by including...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001596
EISBN: 978-1-62708-225-9
... deflection, greatly increasing the torsional stresses on the spring. To understand the fatigue limits under these test conditions, a bench test was used to establish the fatigue strength of the springs. The bench tests showed that the failed springs had an unacceptable surface texture that reduced...
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
... before the shear stress reaches the shear strength of the steel. Fracture occurs normal to the 45° tensile plane, producing a conical or star-shaped fracture surface. Example 2: Torsional-Fatigue Fracture of a Large 4340 Steel Shaft That Was Subject to Cyclic Loading and Frequent Overloads...
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 Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001430
EISBN: 978-1-62708-236-5
... torsional fatigue. A second shaft carried as spare gear was fitted and failure took place in a similar manner in about the same period of time. Examination revealed that the tapered portion of the Fe-0.6C carbon steel shaft had been built up by welding prior to final machining. A detailed check...
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
..., indicating a strength in the expected range for quenched-and-tempered grade 4340 steel shafts. A hot-acid etch showed the steel to be free from pipe, segregation, or other irregularities. Conclusion The basic failure mechanism was fracture by torsional fatigue, which started at numerous surface shear...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001242
EISBN: 978-1-62708-223-5
... of the end faces of the bearing liners. Camshafts Eccentrics Torsional fatigue 34CrMo4 Fatigue fracture During dismantling of an eccentric camshaft of 340 mm diameter that had worked for about 1 2 year with a total of 450,000 load reversals, it was found that it had cracked on both...
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
... different approximations of the fatigue diagram. The shape of the diagram depends mainly on the material, the geometry of the component, and the type of loading (axial, bending, torsion, and shear). The lines are determined by the ultimate tensile strength, S u , and the alternating fatigue strength...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001547
EISBN: 978-1-62708-225-9
..., no microstructural damage was detected at the base of the end hooks. The radial crack pattern at the base of an end hook on the failed spring ( Fig. 2 ) strongly resembles the type of damage caused by torsional fatigue in shafts. 2 This indicates torsional stresses were concentrated in this area of the end...