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infinite-life criterion

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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
... fluctuations. This article begins with an overview of fatigue properties and design life. This is followed by a description of the two approaches to fatigue, namely infinite-life criterion and finite-life criterion, along with information on damage tolerance criterion. The article then discusses...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002350
EISBN: 978-1-62708-193-1
.... These include infinite-life criterion, finite-life criterion, and damage tolerant criterion. The article describes the individual property requirements of these approaches. It also presents selected examples of properties that reflect some detail of these approaches. damage tolerant criterion fatigue...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003313
EISBN: 978-1-62708-176-4
... , Volume 19 of ASM Handbook . Infinite-Life Criterion (<italic>S</italic>-<italic>N</italic> Curves) <xref rid="a0003313-ref4" ref-type="bibr">(Ref 4)</xref> The safe-life, infinite-life philosophy is the oldest of the approaches to fatigue. Examples of attempts to understand fatigue by means...
Image
Published: 01 January 2000
Fig. 2 A synthetically generated Haigh diagram for an alloy steel (620 MPa, or 90 ksi, ultimate tensile strength) based on typically employed approximations for the axes intercepts and using the Goodman line to establish the acceptable envelope for safe-life, infinite-life combinations More
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
...-life criterion gas porosity heat treatment inclusions infinite-life criterion internal bursts macropitting micropitting reversed bending rolling-contact fatigue rotational bending strengthening stress distribution subcase fatigue thermal fatigue torsional loading FATIGUE damage...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003386
EISBN: 978-1-62708-195-5
... design goal is to have an inspection interval equal to the desired life of the aircraft. However, if this is not achievable due to an increase in the severity of usage or analytical errors, the aircraft can be operated safely for an extended period of time with the imposition of periodic inspections...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002396
EISBN: 978-1-62708-193-1
.... The traditional approach to fatigue design with ferrous alloys, based on endurance limits and infinite life criterion, has been supplanted by approaches based on finite-life behavior that emphasize the cyclic deformation aspects of the fatigue process ( Ref 4 , 5 ). Central to these approaches for predicting...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002470
EISBN: 978-1-62708-194-8
... exist in any “homogeneous” material used in manufacturing a product ( Ref 6 , 7 ). These cracks can exist at any stage in the life of the structure or machine component, and they should be accounted for not only after a part has been in service for a length of time, but also during the entire...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002366
EISBN: 978-1-62708-193-1
... it is understood that the fatigue crack initiation life, N f , corresponds to a crack length on the order of 500 to 1000 μm. Static Yield Criteria Initial approaches to modeling multiaxial fatigue behavior were based on static yield criteria developed a century ago, as discussed in the previous section...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002469
EISBN: 978-1-62708-194-8
... failure after more than approximately 100,000 cycles. As the loading amplitude is decreased, the cycles-to-failure increase. For many alloys, a fatigue (endurance) limit exists beyond 10 6 cycles. The endurance or fatigue limit represents a stress level below which fatigue life appears to be infinite...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006767
EISBN: 978-1-62708-295-2
...., multiaxial yield criteria). One failure mode theory is the Rankine (or maximum normal stress) criterion, where the maximum principal stress is used. The other is the Tresca theory based on the maximum shear stress. The Rankine criterion holds that inelastic deformation at a point begins when the maximum...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002476
EISBN: 978-1-62708-194-8
... for tensile strength. It reviews life prediction reliability models used for predicting the life of a component with complex geometry and loading. The article outlines reliability algorithms and presents several applications to illustrate the utilization of these reliability algorithms in structural...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005774
EISBN: 978-1-62708-165-8
... stresses, resulting in stronger parts with better fatigue life and less energy consumed in processing. Due to the environmental benefits of IQ being a water-only quenchant, the IQ process facilitates part-by-part heat treatment operations within the manufacturing cell. Heat Transfer during Quenching...
Series: ASM Handbook
Volume: 2B
Publisher: ASM International
Published: 15 June 2019
DOI: 10.31399/asm.hb.v02b.a0006549
EISBN: 978-1-62708-210-5
... behavior at half-failure life. (b) Strain control, initiation criterion not specified. (c) Stress control, initiation criterion not specified. (d) Stress relieved by stretching 1.5 to 3% permanent set. Source: Ref 41 – 43 Another distinct advantage of the strain-life method is its...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003530
EISBN: 978-1-62708-180-1
... project. Frequently, principal stresses and maximum shear stresses are important to the designer because both are used in common failure expressions to calculate maximum load capability (e.g. multiaxial yield criteria). One failure mode theory is the Rankine (or maximum normal stress) criterion, where...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0009219
EISBN: 978-1-62708-176-4
... infinite life, fatigue limit, or endurance limit for a material at a stress ratio of −1.0. This approach is based on the concept that a stress amplitude exists below which most materials will not fail, at least on the average, even if they are cycled an infinite number of times. If the material...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002395
EISBN: 978-1-62708-193-1
... - N tests, while crack growth rate testing has stemmed from the change to a “fail safe” criterion from the use of a “safe lifecriterion. The fail safe criterion generally assumes that either cracks are present in the material before service or that cracks are initiated very early in the service...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006344
EISBN: 978-1-62708-179-5
... plays a role in engineering, and each property is used in the context of an underlying fatigue design philosophy, as follows: Design philosophy Design methodology Principal testing data description Safe life, infinite life Stress-life (high-cycle) fatigue S - N Safe life, finite life...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002381
EISBN: 978-1-62708-193-1
... the strength would drop below an acceptable limit. In order to determine which size of crack is admissible, one must be able to calculate how the structural strength is affected by cracks (as a function of their size), and in order to determine the safe operational life, one must be able to calculate the time...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002394
EISBN: 978-1-62708-193-1
... component life. Finally, this data was published in a fashion that would hasten its application. The use of fracture mechanics thus has evolved into the U.S. Air Force design program for aircraft that are damage tolerant, that is, aircraft designed to operate with manufacturing and in-service induced...