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S-N curve

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200083
EISBN: 978-1-62708-354-6
... and stress rupture. The chapter describes the three main approaches to evaluating and designing structures relative to fatigue resistance: the S-N curve approach for high cycle fatigue, the strain range approach for low cycle fatigue, and the fracture mechanics approach. Two approaches to design against...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870045
EISBN: 978-1-62708-344-7
...Abstract Abstract This chapter familiarizes readers with the methods used to quantify the effects of fatigue on component lifetime and failure. It discusses the development and use of S-N (stress amplitude vs. cycles to failure) curves, the emergence of strain-based approaches to fatigue...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540121
EISBN: 978-1-62708-309-6
... the stress level at which the material will never fail. Figure 3.12 schematically represents this type of engineering data. Simply plotting the applied stress level against the number of cycles to failure, it is commonly known as the S-N curve. Fig. 3.12 Schematic representation of engineering...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540415
EISBN: 978-1-62708-309-6
... Fig. A9.5 K IC versus temperature for Ti-25Al-10Nb-3V-1Mo (dotted line) and Ti-24Al-11Nb (solid line). Source: Ref A9.1 Fig. A9.6 S-N curves for Ti-25Al-10Nb-3V-1Mo and Ti-24Al-11Nb at room temperature. f = 30 Hz. Source: Ref A9.1 Fig. A9.7 S-N curves for Ti-25Al...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540397
EISBN: 978-1-62708-309-6
... da/dN curves for 15 aluminum alloys, R = 0 to 0.1. Source: Ref A7.8 Tensile and fracture toughness data for the new 7033-T6 high-strength automotive alloy are presented in Table A7.3 , which also compares these properties with the conventional 2014-T6 and 6061-T6 alloys. S-N curves...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2022
DOI: 10.31399/asm.tb.isceg.t59320049
EISBN: 978-1-62708-332-4
... is displayed as stress-life plots, called S-N curves . They are a plot of life or the cycles to failure on the x -axis (to logarithmic scale) and the stress amplitude on the y- axis. Figure 5.15 ( Ref 5 ) is an example of a stress-life plot (SN curve) for ductile iron that is close to SAE International...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ahsssta.t53700071
EISBN: 978-1-62708-279-2
... stress for conventional steels. Source: Ref 4.1 Fig. 4.4 Instantaneous n -values of Fe-18Mn-0.6C-1.5Al TWIP steel. Source: Ref 4.4 Fig. 4.5 S - N curve showing fatigue characteristics and endurance limit of a metal displaying a fatigue limit. Source: Adapted from Ref 4.5...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780249
EISBN: 978-1-62708-281-5
... ( Ref 1 ) involves using the endurance limit concept developed from the stress range versus number of cycles to final fatigue, or S - N , curve (Wohler diagram) as described in the preceding article, “ Fatigue Testing and Behavior .” In spite of its empirical nature, the S - N approach is a commonly...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610209
EISBN: 978-1-62708-303-4
... Crack nucleation effect Microcrack propagation effect Surface roughness Accelerates No effect Degree of cold work or dislocation density Retards Accelerates Residual compressive stresses Minor or no effect Retards Source: Ref 33 Fig. 52 S - N curves ( R = –1) for Ti...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610147
EISBN: 978-1-62708-303-4
... Fig. 6 Constructing a constant-life diagram from a set of S - N curves containing three R ratios, where R = −1 is the fully reversed cyclic loading condition and R = + 1 is the monotonic ultimate strength of the material (no cyclic load). (a) Typical S - N curves. (b) Typical constant-life...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610377
EISBN: 978-1-62708-303-4
... orientation on fatigue performance of AS4/3502 carbon/epoxy laminates. The ordinate represents the fatigue strength ratio, which is the ratio of fatigue stress to static strength. Source: Ref 10 Fig. 21 S - N curves for T300/934 carbon/epoxy laminates, R = –1. A, unidirectional [0] 16 ; B...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320133
EISBN: 978-1-62708-347-8
... ) curves of a gear steel. For gears carburized and hardened, the S - N curve for original and damaged material due to momentary overload remains more or less the same. But unfortunately, this is not the case with gears that are nitrided. Tests show that the nitrided gears do not have the same...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490111
EISBN: 978-1-62708-340-9
... and the S-N Curve Most laboratory fatigue testing is done either with axial loading or in bending, thus producing only tensile and compressive stresses. The stress usually is cycled either between a maximum and a minimum tensile stress or between a maximum tensile stress and a maximum compressive...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240243
EISBN: 978-1-62708-251-8
.... A comparison of the S - N curves for steel and aluminum is shown in Fig. 14.4 . Note that steel not only has a higher fatigue strength than aluminum, but it also has an endurance limit. Below a certain stress level, the steel alloy will never fail due to cyclic loading alone. On the other hand, aluminum...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250227
EISBN: 978-1-62708-345-4
... N i = 1 where D i is the damage done to a part due to a certain stress level, n i is the number of cycles the part experienced at this stress level, and N i is the number of cycles to failure at that stress level. Figure 6 shows a typical endurance ( S - N ) curve...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540383
EISBN: 978-1-62708-309-6
... in working with some random block spectra. This method requires no modeling other than calculating an rms value that ultimately represents all the loads in the entire spectrum. Then this rms load/stress level is directly used with the material S-N curve. Although the rms method is computationally efficient...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780055
EISBN: 978-1-62708-281-5
... dependent on the applied load. S - N curves have been generated for a number of thermoplastics ( Ref 10 ) at room temperature with a standard tensile specimen with a net cross section of 12.7 by 3.2 mm (0.5 by 0.125 in.). The tensile load was varied from a very small load (nearly zero) to various maximum...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630117
EISBN: 978-1-62708-270-9
.... Fig. 18 Typical fatigue ( S-N ) diagram of laboratory fatigue testing of medium-strength ferrous metal. Fig. 22 Schematic representation of fatigue-fracture surface marks produced in smooth and notched cylindrical components under various loading conditions. Note that the final rupture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540411
EISBN: 978-1-62708-309-6
.... Source: Ref A8.2 Fig. A8.2 da/dN curves for mill-annealed Ti-6Al-4V plate, 6.4 mm (0.25 in.) thick, with buckling restraint. Source: Ref A8.3 Fig. A8.3 S-N curves for Ti-6Al-4V castings. Source: Ref A8.4 Fig. A8.4 da/dN curves for Ti-6Al-4V castings. Source: Ref...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ahsssta.9781627082792
EISBN: 978-1-62708-279-2