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S-N fatigue

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Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001837
EISBN: 978-1-62708-181-8
... features (averaged over all directions in the projection plane) L ¯ 3 = ( π 2 ) L L ′ N L ′ L p Mean perimeter length of closed figures L ¯ p = ( 4 π ) L A ′ N A ′ S Mean area of curved two...
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
... design concepts Design philosophy Design concept Material characteristics Safe-life, infinite-life Nominal stress or local stress concept S - N curve, S a = f ( N F ) Fatigue diagram, S a = f ( S m ) Safe-life, finite-life Local strain concept Low-cycle fatigue curve...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005405
EISBN: 978-1-62708-196-2
... longer than scales of intrinsic microstructure barriers such as grains or phases; and N p is the number of cycles to propagate the crack(s) to failure. In Eq 1 , N nucl is the number of cycles to nucleate a crack (formation of a crack embryo and subcritical propagation to size of stable nucleus...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005419
EISBN: 978-1-62708-196-2
..., da / dN , depends on the range of the stress-intensity factor, Δ K = K max – K min , and is independent of geometry, provided the correct geometry correction, Y , is used ( N is the number of load cycles). Δ K is calculated as: (Eq 2) Δ K = Y Δ σ π a where the terms are as...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... related to the interprecipitate spacing by: (Eq 21) l = S V f − 1 / 3 where V f is the volume fraction of precipitates. Combining Eq 19 to 21 gives the result for the life under TMF conditions to be: (Eq 22) N i = ν C 3 1 / β · D A K / β D α...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005411
EISBN: 978-1-62708-196-2
... equation has been formulated to represent the dwell-time effects ( Ref 3 ): (Eq 1) d a d N = c 1 ( Δ K ) n 1 + c 2 ( Δ K ) n 2 ( t h ) where a is crack size; N is fatigue cycles; Δ K is the cyclic stress-intensity parameter; n 1...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005654
EISBN: 978-1-62708-198-6
... loading of an engineering component. In the low-cycle fatigue (LCF) regime, the durability of a smooth material subjected to cyclic mechanical loading can be expressed in terms of the Coffin-Manson equation ( Ref 49 ): (Eq 8) Δ ε p = ε f ′ ( N f ) − c where Δε p is the...
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
... 3 by using an integral 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...
Book Chapter

By Sam Nasser
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005684
EISBN: 978-1-62708-198-6
..., % IACS 13 Specific heat, cal/g/°C 0.036 Thermal conductivity, cal/cm 2 /cm°C/s 0.13 Annealed  Ultimate tensile strength, MPa (ksi) 285 (41)  Yield strength, MPa (ksi) 170 (25)  Elongation, % 30+  Reduction in area, % 80+  Hardness, HV 90 Cold worked  Ultimate...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005682
EISBN: 978-1-62708-198-6
... to perform as expected. The specific optimization of properties such as elasticity, yield stress, ductility, time-dependent deformation, ultimate strength, fatigue strength, hardness, and wear resistance really depends on the type and functionality of the specific implant part. The device under...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006786
EISBN: 978-1-62708-295-2
... velocities of inches per second (0.1 m/s) have been measured in fracture-mechanics-type tests. These tests also gave very low threshold stress intensities for crack growth. Because of the rapid crack growth, failure of small specimens or components is virtually instantaneous, once a sufficient stress is...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005227
EISBN: 978-1-62708-187-0
... fiber reinforcement, vol% Specific strength, N · m/kg Specific modulus, N · m/kg Al-Li/Al 2 O 3  0° 60 20,000 7.59 × 10 7  90° 60 4,986–6,000 4.406 × 10 7 Ti-6Al-4V/SiC  0° 35 45,337 7.77 × 10 7  90° 35 10,622 … Mg/carbon (Thornel) 38 28,333 … Al...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006784
EISBN: 978-1-62708-295-2
.... However, even in these severe cases, it may be difficult to prove with any degree of certainty that the most significant cause of the fracture was the presence of hydrogen. When the compromised mechanical properties in the subject part(s) are due to hydrogen embrittlement, there may be a tendency to...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000610
EISBN: 978-1-62708-181-8
... after being in service for 8 h at 540 °C (1000 °F) in contact with a gas stream having the following composition (in vol%): 30% H 2 O, 12.6% H 2 , 0.43% Ar + O 2 , 35.2% N 2 , 8.4% CO, 11.7% CO 2 , 1.0% CH 4 , and 0.105% H 2 S. Particulate matter in contact with the tube contained 32 to 34 wt% C...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006780
EISBN: 978-1-62708-295-2
... of stress-rupture stress versus rupture life for Co-Cr-Ni-base alloy S-590. The significance of inflection points A , B , N , O , and Y is explained in the text. Source: Ref 18 Several parameters have been used for comparison and interpolation of stress-rupture data for metallic...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003225
EISBN: 978-1-62708-199-3
.... The resulting curve of data points ( Fig. 16 ) is called an S-N curve. Steels show an asymptotic behavior; they display a fatigue limit or “endurance” limit at a high number of cycles (typically >10 6 ) under benign environmental conditions. Most other materials do not exhibit this response...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003241
EISBN: 978-1-62708-199-3
... R Ball 1 2 60 Red S Ball 1 2 100 Red V Ball 1 2 150 Red Superficial Rockwell Tester 15N N Brale … 15 … 30N N Brale … 30 … 45N Brale … 45 … 15T Ball 1 16 15 … 30T Ball 1 16 30 … 45T...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000616
EISBN: 978-1-62708-181-8
.... Etched in 60% ethanol, 30% n -butanol, 10% perchloric acid (70%). TEM thin foil, 76,800× (J.K. Tien, V.C. Nardonne, and D. Matejczyk, Columbia University). Fatigue fracture of Nimonic 115 at room temperature and 845 °C (1550 °F). Thermal treatment: solution treat 24 h at 1230 °C (2250 °F...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
... introduction only. When considering actual fracture on real components, it is important to thoroughly gather information regarding the material state, the stress state(s), and the environmental conditions that may have influenced the fracture. Tables 1 to 3 provide useful, general information that can...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003143
EISBN: 978-1-62708-199-3
..., transverse; S, short Fig. 1 Comparison of typical tensile strengths reported for various titanium alloys Fig. 2 Comparison of typical 150 h, 0.1% creep strengths reported for various titanium alloys Fig. 3 Scatterband comparison of fatigue-crack growth rate behavior of wrought β...