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fatigue limit

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Published: 01 June 2019
Fig. 3 Effect of surface condition on fatigue limit. (a) Effect of surface condition on fatigue behavior of steels that were hardened and tempered to 269 to 285 HB. (b) Effect of tensile strength level and surface condition of steel on fatigue limit; strengths are given for 10 6 cycle fatigue More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0047846
EISBN: 978-1-62708-218-1
... was removed in an effort to reduce cost and hence the shaft was subjected to increased vibration and shock loading. Insufficient fatigue limit of the shaft was revealed by fatigue testing of the shafts taken from stock in a rotating-beam machine. As a corrective measure, the fatigue limit of shafts...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001786
EISBN: 978-1-62708-241-9
... is greater than fatigue limit σ SN = 300 N/mm 2 . Since, σ f > σ SN , this has resulted in failure of spline shaft ( Figs. 15 , 16 ). Maximum stress acting on the spline shaft is less than fatigue limit of material (300 N/mm 2 from SN curve) in the first case. Hence, it will not result...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0047823
EISBN: 978-1-62708-236-5
.... The shaft surface both near and in the keyways indicated fretting which greatly reduced the fatigue limit of the shaft metal and initiated fatigue cracks. Fatigue marks were observed on the fractured key. Repetitive impact loading was responsible for propagation of the cracks. The high cyclic bending...
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 Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001309
EISBN: 978-1-62708-215-0
... over the fatigue limit of the material. A strain gage static loading test verified FEM results, and finite element techniques were applied in the design of reinforcing members to renovate the frames. Material properties were determined and welding procedures specified for the reinforcing members...
Image
Published: 01 June 2019
Fig. 11 Fatigue diagram showing the reduction in the fatigue strength of Spring A with poor texture as compared to springs with good texture. Also plotted are the fatigue limits based on the modified Goodman diagram in Fig. 10 . More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0006897
EISBN: 978-1-62708-222-8
... as stress points; therefore, the stress and number of stress cycles that cause corrosion fatigue failure of a metal are lower than the fatigue limit of the same metal without the corrosive environment. Fig. 1 Broken copper tail wires of an aerial clamp Fig. 2 Tail wires near failures. 3...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0047850
EISBN: 978-1-62708-233-4
...). Recommendations The development of a quenched-and-tempered microstructure would result in an improvement of the fatigue strength of the shaft. A 40% increase in the fatigue limit could be effected by quenching and tempering the steel to a hardness of 30 to 37 HRC (286 to 344 HB) after machining. Shot peening...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0048592
EISBN: 978-1-62708-218-1
... was of insufficient alloy content. Also, the tensile strength and endurance limit were lower than specified and were inadequate for the application. The material for the cap screw was changed from modified 1035 steel to 5140 steel. Brittle fracture Fatigue limit Tensile strength 1035 UNS G10350 Fatigue...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001388
EISBN: 978-1-62708-215-0
... loading with a stress ratio of 0.05 ( Fig. 10 ). The fatigue limit was approximately 50 MPa (7 ksi). Fig. 10 S-N curve for the same type of bolts as those that failed in service Stress Analysis It has been shown that the striation spacing in various materials is given by the following...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001722
EISBN: 978-1-62708-236-5
... embrittlement and (2) minimise the reduction of fatigue strength due to plating, are conflicting. The heat treatment must therefore be selected to suit the particular components, the following information being given for guidance: The fatigue limit of high tensile steel components may be markedly reduced...
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
... as a function of the associated mean stress. At zero mean stress, the allowable stress amplitude is the effective fatigue limit for a specified number of cycles. As the mean stress increases, the permissible amplitudes steadily decrease until, at a mean stress equal to the ultimate tensile strength...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001842
EISBN: 978-1-62708-241-9
..., the stimulus to fracture would be the fully reversed bending stress of 1770 psi (12,204 kPa). To estimate the resistance to fracture in fatigue, the following expression was used: Sn | 10 6 = 0.5 Su C L C D C S / K f , where Sn|10 6 is the fatigue limit at 10 6 cycles...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0001784
EISBN: 978-1-62708-218-1
... on fatigue limit. (a) Effect of surface condition on fatigue behavior of steels that were hardened and tempered to 269 to 285 HB. (b) Effect of tensile strength level and surface condition of steel on fatigue limit; strengths are given for 10 6 cycle fatigue life. Figure 4 shows the relationship...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0048134
EISBN: 978-1-62708-235-8
... toward the outside of the bend. The crack had been initiated at a spiral mark where the fatigue limit had been decreased by a weak skin. The small bend radius could create a condition that would result in straining at the bend zone and therefore render the section weak. It is difficult to determine...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001459
EISBN: 978-1-62708-234-1
... Abstract Fundamentals of fatigue failure are outlined. Addressed are fatigue crack characteristics, basic crack types, unidirectional bending, alternate bending, rotary bending, torsion, direct stress, and combined stress. Stress cycle, endurance limits, under and overstressing, stress...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001780
EISBN: 978-1-62708-241-9
... 765 717 1.5 Transverse #2 765 717 1.5 Fatigue endurance limit data, Ref. [<xref rid="c9001780-ref11" ref-type="bibr">11</xref>] Table 2 Fatigue endurance limit data, Ref. [ 11 ] Wt.% sulfur Ratio of longitudinal to transverse endurance limit 0.011 1.09 0.021 1.51...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006792
EISBN: 978-1-62708-295-2
... over the volume rather than assuming the entire stressed region experiences the maximum stress, as well as introducing the concept of a fatigue limit, resulting in: (Eq 5) ln ( 1 / S ) = a ∫ V N e ( τ max − τ ∞ ) τ 0 c z 0 h dV where τ...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006768
EISBN: 978-1-62708-295-2
... be used in (but are not necessarily limited to) situations where failures result from overloading, stress corrosion, fatigue, stress concentrations, or inappropriate manufacturing processes. X-ray diffraction residual-stress analysis methods can also be applied to the evaluation of corrective measures...