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life fraction rule

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Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002390
EISBN: 978-1-62708-193-1
... Abstract The approaches to spectrum life prediction in components can be classified into two types, namely, history-based methods, using the life-fraction rule or other damage rules, and postservice evaluation methods. This article discusses the variables affecting the material crack growth...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
... article discusses metallurgical instabilities of steel-based alloys and nickel-base superalloys. It provides information on several life assessment methods, namely, the life fraction rule, parameter-based assessments, the thermal-mechanical fatigue, coating evaluations, hardness testing, microstructural...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002365
EISBN: 978-1-62708-193-1
... their manner of use and limitations. The use of the Palmgren-Miner rule for life prediction for variable amplitude loading is also discussed. fatigue life Palmgren-Miner rule strain-based approach stress-based approach variable amplitude load FATIGUE LIFE ESTIMATES are often needed in...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002375
EISBN: 978-1-62708-193-1
... Abstract This article summarizes the various kinds of gear wear, including fatigue, impact fracture, wear, and stress rupture, describes how gear life in service is estimated. It presents the rules concerning lubricants in designing gearing and analyzing failures of gears. The article presents...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003512
EISBN: 978-1-62708-180-1
... exhaustion. Service time has reached some arbitrarily chosen fraction of calculated or experimental failure life. Previous failure statistics indicate high probability of failure. Frequency of repair renders continued operation uneconomical. Nondestructive inspection reveals cracking. Surface...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006462
EISBN: 978-1-62708-190-0
.... The role of NDE and its partner, structural health monitoring (SHM), is to provide an informed basis for reliable, yet cost-effective, life assessment decisions for structural components. Implementation rules for NDE, damage tolerance, and related life assessment strategies are governed by a...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003382
EISBN: 978-1-62708-195-5
... testing full-scale components with engineered defects to a statistically based lifetime. Perhaps the most simple life prediction model is the Palmgren- Miner rule ( Ref 27 , 28 ): (Eq 6) ∑ i = 1 m n i N i = 1 where m is the number of different stress levels; n i...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003516
EISBN: 978-1-62708-180-1
... calculate the life of a component subject to variable loading, a method is needed that relates constant-amplitude fatigue test data to a random stress history. The Palmgren-Miner cumulative damage rule ( Ref 7 , 8 ), which has the form: ∑ i = 1 m n i N i = 1 provides a...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003314
EISBN: 978-1-62708-176-4
... been applied to practical situations. The three most widely used are the time- and cycle-fraction rule from the ASME Code Case N-47-23 ( Ref 68 ), strain-range partitioning (SRP) ( Ref 69 ) and its total strain version ( Ref 70 ), and continuous damage mechanics ( Ref 71 ). The fatigue machines and...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003514
EISBN: 978-1-62708-180-1
... sampling probabilistic analysis probability of failure response surface method risk analysis system reliability target reliability time-variant reliability APPLICATION of probabilistic analysis methods for life assessment of structural components is becoming more prevalent because...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002392
EISBN: 978-1-62708-193-1
... relationship Fig. 3 Crack growth data for 2024-T3 aluminum. 2024-T3 Al, 0.090 in. sheet, L-T direction, 70 °F, lab air; frequency, 0.3 to 20 Hz; CC specimens, 0.090 in. thick, 12.0 in. wide. Source: Damage Tolerant Handbook , MCIC Handbook, HB-01 Fig. 1 Typical probability-stress-life-plot...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006455
EISBN: 978-1-62708-190-0
...) Containing no tin or lead; absorption equivalence is greater than these values when either element is present In addition to exposure charts, nomograms or specially constructed slide rules are often used for calculating radiographic exposures. These devices can be constructed using the same type of...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006646
EISBN: 978-1-62708-213-6
..., selection rules, gamma-ray polarization, isomer shift, quadrupole interaction, and magnetic interaction. Experimental arrangement for obtaining ME spectra is described and several examples of the applications of ME are presented. The article contains tables listing some properties of Mossbauer transitions...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002414
EISBN: 978-1-62708-193-1
... aluminum composites ductility fatigue crack propagation fracture toughness impact toughness matrix alloy matrix microstructure particle size particle spacing strain-life behavior stress-life behavior tensile properties volume fraction DISCONTINUOUSLY REINFORCED ALUMINUM (DRA) composites...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002451
EISBN: 978-1-62708-194-8
... Abstract This article provides an overview of cost analysis in materials selection. It discusses the several categories of alternatives for cost analysis. These include rules of thumb, accounting methods, and analytical methods. The article describes the methods for evaluating materials...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002487
EISBN: 978-1-62708-194-8
... parts. As with production machining systems, the general design-for-machining rules discussed in the next section of this article are broadly applicable to these systems. In CNC systems, however, the actual machining time consumes a smaller fraction of the total processing time. Reducing the time...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002364
EISBN: 978-1-62708-193-1
... reversed stress amplitude for a given life (i.e., 10 6 , 10 5 , etc.); S u is the ultimate tensile strength of the material; S y is the yield strength; and S o is the mean stress. For the case of tensile mean stresses, as a rule-of-thumb: Soderberg's relation is very conservative for most...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002472
EISBN: 978-1-62708-194-8
.... , Effect of Temperature Variation on the Long-Time Rupture Strength of Steels , Trans. ASME , Vol 74 , 1952 , p 777 – 781 82. Woodford D.A. , A Critical Assessment of the Life Fraction Rule for Creep-Rupture under Nonsteady Stress or Temperature , Paper No. 180.1 , Int. Conf. on Creep...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001753
EISBN: 978-1-62708-178-8
... 16.06 65.5 165 92 238 Uranium 44.915 99.27 245 2 0 0.917 0.2486 52.8 200 93 237 Neptunium 59.537 (radioactive) 68.3 5 2 5 2 32.55 0.06727 93.2 75 Note: E γ , is the γ-ray energy of the Mössbauer transition, t 1/2 is the half-life of the...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005561
EISBN: 978-1-62708-174-0
... the Rosenthal equations ( Ref 41 ) to provide a circular disc heat source rather than a point source. The hardness prediction is based on estimating the volume fractions of microstructural constituents (martensite, bainite, ferrite, and pearlite) and using the rule of mixtures to approximate the...