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life-prediction models

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Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005407
EISBN: 978-1-62708-196-2
... is discussed further. Fig. 1 Schematic models of artificial neural networks for simulation and prediction of various correlations in titanium alloys. (a) Time-temperature transformation (TTT) diagrams. (b) Mechanical properties of conventional titanium alloys. (c) Fatigue stress life diagrams...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005403
EISBN: 978-1-62708-196-2
... approach for CDRX to predict microstructural evolutions occurring during hot deformation, along with an illustration of the main features of the CDRX mesoscale model. recrystallization static recrystallization dynamic recrystallization continuous dynamic recrystallization discontinuous dynamic...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005966
EISBN: 978-1-62708-166-5
... decarburization, manifesting a graphite-free near-surface region or rim. This can lead to increased tool wear and vibrations during surface machining. Extreme degrees of such decarburization can involve a ferritic rim, which reduces machining tool life by fostering a built-up edge. Casting practice-related...
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
... damage mechanisms and elucidate mechanism coupling interactions. In addition, life modeling in TMF conditions and a practical application of TMF life prediction are presented. coupling interactions fatigue life prediction thermomechanical fatigue THERMOMECHANICAL FATIGUE (TMF) is the general...
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
... Abstract The overarching goal of life-prediction research is to develop models for the various types of time dependencies in the crack-tip damage accumulation that occur in materials subjected to elevated temperatures. This article focuses on describing the models based on creep, oxidation...
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
... , 105 – 113 ). These include case carburizing, induction hardening, shot peening, low-plasticity burnishing, hard turning, and gravity peening. These residual stresses can be measured via x-ray diffraction and included in life-prediction models. Now common in some bearing applications, these steels...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005412
EISBN: 978-1-62708-196-2
... interfaces ( Ref 5 ). In microsystems technology, interfaces determine the service life and performance of devices ( Ref 6 ). Atomistic modeling is a powerful tool for understanding the structure of defects in a crystalline lattice. However, there is an infinite range of possible interface structures, and...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005415
EISBN: 978-1-62708-196-2
... used at the microscopic level, phase-field models can be applied to understand and predict fundamental properties of extended defects such as interfacial width and dislocation core size, chemical and structural variations within the defects and the associated defect energies, as well as activation...
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
... Abstract The purposes and methods of fatigue modeling and simulation in high-cycle fatigue (HCF) regime are to design either failsafe components or components with a finite life and to quantify remaining life of components with pre-existing cracks using fracture mechanics, with the intent of...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006443
EISBN: 978-1-62708-190-0
...-consuming experimental demonstration programs in the prediction of NDE reliability Improve the validation and optimization of inspection procedures Improve component design and the definition of the life cycles Another potential application of NDE reliability models may involve integration with...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005459
EISBN: 978-1-62708-196-2
..., for nickel-base superalloys. However, the recrystallized grain size at the end of deformation from Eq 18 should be used as the starting grain size for grain growth instead of d mdyn ( Ref 6 ). The workpiece temperature is rarely constant during real-life TMP operations but may vary due to...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005427
EISBN: 978-1-62708-196-2
... design calculations. When residual stresses are calculated using VAC tools, fatigue durability estimates can be more realistic. For example, without accounting for residual stresses, the predicted life of a cylinder head is estimated at over 10 7 cycles, a typical design life for a cylinder head...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005420
EISBN: 978-1-62708-196-2
... ( Ref 1 ). Nonmetallic inclusion particles act as sites of stress concentration and hydrogen gas nucleation, leading to lower fatigue life, hydrogen embrittlement, surface defects, and other problems in the final product. Predicting their damage requires knowledge of the number, size distribution...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006277
EISBN: 978-1-62708-169-6
... or strongly microtextured regions, which significantly reduce the fatigue life of titanium alloy components ( Ref 34 ). To fully optimize material properties for a given application, control of texture and microtexture with innovative processing strategies requires fundamental understanding of and...
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
... between model and experiment. LCD is a linear-cumulative damage model, and α = 1.8 is a constant constraint model. (b) Wing gust and maneuver loading spectrum. Source: Ref 23 The models for crack growth life-prediction have been implemented in several, popular computer codes that are widely...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005458
EISBN: 978-1-62708-196-2
..., internal damage in the form of voids often develops in many engineering alloys. High-temperature cavitation models developed initially for the prediction of creep life in limited-ductility materials with creep-resistant microstructures ( Ref 1 , Ref 2 , Ref 3 , Ref 4 , Ref 5 , Ref 6 ) were extended to...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006465
EISBN: 978-1-62708-190-0
... more traditional forms of defects with life, and hence, give science-based criteria for base material standards and limits for allowables and required anomaly or defect detection capabilities. The desire to better understand and characterize these processes has led to the development of multiphysics...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004002
EISBN: 978-1-62708-185-6
... alloys in the 2 xxx , 6 xxx , and 7 xxx series can be successfully forged into all forging types, including high-definition and precision closed-die forgings. Some evidence suggests that these materials are more abusive of closed-die tooling and that die life in forging these materials may be shorter...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005439
EISBN: 978-1-62708-196-2
... understanding of conditions when diffusion is important and how it leads to composition variations as a function of time and temperature. Diffusion can play an important role in both materials processing and materials degradation during the service life of a part. For example, nearly all heat...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006773
EISBN: 978-1-62708-295-2
... critical crack-size assessment. Although still in the stages of development, this feature may serve as a very strong tool in failure analysis and life assessment. Much like the application of fracture mechanics, the majority of FEA packages also now offer the extension of using fatigue analysis features...