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strain life curve

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Published: 01 December 2019
Fig. 9 Strain-life curve More
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Published: 30 August 2021
Fig. 23 Derivation of the strain-life fatigue curve adjusted for mean stress effects. Adapted from Ref 4 More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001852
EISBN: 978-1-62708-241-9
... loads have been investigated. Test samples have been cut and machined from an electroformed mould. Monotonic properties such as modulus of elasticity, yield and ultimate strengths, percentage elongation, and area reduction have been obtained. Fatigue properties including cyclic curve, strain-life...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006819
EISBN: 978-1-62708-329-4
.... The article reviews fatigue assessment methods incorporated in international design and post construction codes and standards, with special emphasis on evaluating welds. Specifically, the stress-life approach, the strain-life approach, and the fracture mechanics (crack growth) approach are described...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001788
EISBN: 978-1-62708-241-9
... extrusion of Al-6063 billet material. They were examined to identify critical fatigue failure locations, determine corresponding stresses and strains, and uncover correlations with process parameters, design features, and life cycle data. The fatigue damage models are based on Morrow’s stress and strain...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006807
EISBN: 978-1-62708-329-4
... studies on heater tube creep testing and remaining-life assessment, and pressure vessel time-dependent stress analysis showing the effect of stress relaxation at hot spots. creep curve creep testing elevated-temperature life assessment heater tubes high-temperature components hydrogen attacks...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003545
EISBN: 978-1-62708-180-1
... that are subjected to gradients in stress (strain) and temperature. An example of a creep-related crack is shown in Fig. 2 . Cracks may develop at a critical location and propagate to failure before the end of the predicted creep-rupture life. Creep cracking may also originate at a stress concentration...
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
..., elastic modulus, fatigue life, and oxidation resistance. Total strain at temperature is given by the sum of elastic stress-strain modulus, thermal expansion strain, and creep strain. Change in elastic modulus with temperature cannot be neglected at higher homologous temperatures. Parametric modeling...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
...Abstract Abstract Thermomechanical fatigue (TMF) refers to the process of fatigue damage under simultaneous changes in temperature and mechanical strain. This article reviews the process of TMF with a practical example of life assessment. It describes TMF damages caused due to two possible...
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
... crack initiation or crack propagation or even total fatigue life. For fatigue crack initiation, the alternating stress ( S ) versus the number of cycles ( N ) to fail is typically represented by an S - N curve. For fatigue life, accounting for the elastic and plastic behavior, strain-life approach may...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001758
EISBN: 978-1-62708-241-9
... strain (deform) below its yield strength in order to relieve stress. Creep is a time- and temperature-dependent process, typically exhibiting a characteristic curve similar to that shown in Fig. 3 [ 2 ]. As the curve indicates, creep strain accumulation generally takes place in three stages, designated...
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
... m ) Safe-life, finite-life Local strain concept Low-cycle fatigue curve, ε a = f ( N i ) Cyclic stress-strain (σ a -ε a ) curve Damage tolerance Fracture mechanics concept Threshold value, Δ K th Crack growth diagram, da / dN = f (Δ K , R ) Fracture toughness, K Ic...
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
..., and stress history on the life of a component. For fracture mechanics methods, material behavior is described by fracture toughness and crack growth rate data, and geometry is defined through a dimensionless β factor. For traditional fatigue methods such as the stress-life method, an S - N curve, which...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006801
EISBN: 978-1-62708-329-4
... to their characteristic shape. On the engineering stress-strain curve, initiation of necking occurs after uniform elongation, which is the engineering strain associated with the ultimate tensile strength. Engineering stress is defined as the load divided by the initial cross-sectional area of the dog bone, while true...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003528
EISBN: 978-1-62708-180-1
... and engineering components ( Ref 39 ). When a component undergoes cyclic loading, it can be susceptible to fatigue. The fatigue life for a given component is often characterized with a Wöhler diagram or S - N curve, where S is defined as the total stress range the material experiences during cyclic...
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
... depth profiles. (b) Bending fatigue stress/number of cycles curves. Source: Ref 46 Importance of Residual Stress in Fatigue The strong impact that surface and near-surface residual stresses have on the fatigue life of components underlies the importance of studying the effect of surface...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001732
EISBN: 978-1-62708-218-1
... − ( x θ ) b Where: x is the variable used to express life (miles, hours, cycles, etc.); F ( x ) is the cumulative per cent of the population failed by time x; b is the slope of the Weibull curve of “Shape” parameter which describes the underlying failure distribution; θ...
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
...-concentration factor. Stress-concentration factors for various geometric details are derived from the theory of elasticity and/or obtained experimentally. Stress-concentration curves are available for different design geometries ( Ref 25 ). These curves are useful when investigating a design and doing a life...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006802
EISBN: 978-1-62708-329-4
...Abstract Abstract Life assessment of structural components is used to avoid catastrophic failures and to maintain safe and reliable functioning of equipment. The failure investigator's input is essential for the meaningful life assessment of structural components. This article provides...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.9781627081801
EISBN: 978-1-62708-180-1