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steady-state mechanism

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540281
EISBN: 978-1-62708-309-6
... under the steady-state creep range—that is, where the material follows a creep law in the form: (Eq 6.20) ε ˙ = α ε ˙ 0 ( σ σ 0 ) n —the constant α is usually absorbed in the constant ε ˙ 0 . Therefore, the creep law (i.e...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240265
EISBN: 978-1-62708-251-8
... Following primary creep is the region of secondary creep, where the creep rate is nominally constant at a minimum rate, generally known as the minimum creep rate, shown in Fig. 15.2 . Secondary creep, also known as steady-state creep, occurs when there is a balance between the competing processes of strain...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390007
EISBN: 978-1-62708-459-8
...) entraining a new billet in rolling; (c) on the roll surface during steady state rolling. The third component is the redundant work , and reflects the difficulty of achieving homogeneous deformation. The degree of inhomogeneity is governed by process geometry, often in combination with the effects...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240063
EISBN: 978-1-62708-251-8
... concentration to a lower concentration. Diffusion conditions in which the environment does not change with time are known as steady-state diffusion. An example would be diffusion of a nonreacting gas through a thin metal foil where there is a gas pressure differential on both sides of the foil. The flux, J...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060083
EISBN: 978-1-62708-343-0
... partitioning life relationships. (b) Steady-state creep-rate-modified life relationships. Source: Ref 5.26 Fig. 5.24 Illustration of sensitization for austenitic stainless steel (C > 0.02%). Source: Ref 5.26 Fig. 5.25 Comparison of metallographic sections from specimens of type 316...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490059
EISBN: 978-1-62708-340-9
... W.D. , A Phenomenological Theory of Steady State Creep Based on Average Internal and Effective Stress , Acta Met. , Vol 18 , June 1970 , p 663 - 671 10.1016/0001-6160(70)90096-9 34. Conway J.B. , Stress Rupture Parameters: Origin, Calculations and Use , Gordon and Breach...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780105
EISBN: 978-1-62708-281-5
... 15. “ Standard Practice for Determining and Reporting Dynamic Mechanical Properties of Plastics ,” D 4065-95, Plastics (II) , Vol 8.02 , Annual Book of ASTM Standards , American Society for Testing and Materials 16. Saini D.R. and Shenoy A.V. , Dynamic and Steady-State...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
..., where the creep rate is nominally constant at a minimum rate, generally known as the minimum creep rate, as shown in Fig. 2 . Secondary creep, also known as steady-state creep, occurs when there is a balance between the competing processes of strain hardening and recovery. Secondary creep often...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040017
EISBN: 978-1-62708-300-3
...., velocities, strain rates, and strains ( Fig. 3.5 ). To simplify analysis, it is often assumed that the velocity field is independent of the material properties. Obviously, this is not correct. Fig. 3.5 Metal flow in certain forming processes. (a) Non-steady-state upset forging. (b) Steady-state...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060001
EISBN: 978-1-62708-343-0
... ) to be related to transient creep and the ( t ) term to be related to the steady-state creep. Additional analysis of the Kennedy data, especially as it relates to temperature, is not considered. Further analysis in terms of temperature becomes too complicated for the purpose here. The complication...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860133
EISBN: 978-1-62708-348-5
.... ). Air Force Materials Laboratory, Wright-Patterson Air Force Base , Ohio . [1] Danielson G. C. and Sidles P. H. (1969) . Thermal diffusivity and other non-steady-state methods. In Thermal Conductivity . Academic Press , New York , 149 – 201 . Drude P. (1900...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490265
EISBN: 978-1-62708-340-9
... 1981 Transverse cracking (b) Same as above Pennelec 1981 Transverse cracking Same as above State #4 1983 Transverse cracking (d) Same as above Campbell 1984 Transverse cracking Same as above Vohberg 1987 Catastrophic burst Fatigue/brittle fracture IP shaft Shawnee #1...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2022
DOI: 10.31399/asm.tb.dsktmse.t56050001
EISBN: 978-1-62708-432-1
... discussed the basics of the diffusion mechanisms and the laws which govern them. Cases of steady-state and nonsteady-state diffusion were described. Various applications of diffusion in metallurgical industries were also discussed. Acknowledgments The author would like to thank Prem Aurora, ex...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300001
EISBN: 978-1-62708-323-2
.... The technical societies for the lubricants community in the United States were the American Society of Lubrication Engineers (ASLE) and the American Society of Mechanical Engineers. By 2019, the separation between the materials and lubricant communities was reduced. The WOM conferences have held steady...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780329
EISBN: 978-1-62708-281-5
...·), and the termination rate constant, k t . Equation 2 is derived using the steady-state approximation for the reactive radicals shown in Fig. 6 ( Ref 8 ): (Eq 2) Photooxidation rate = − d [ PH ] d t           = k p [ PH ] ( W i ) 1/2 k...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040059
EISBN: 978-1-62708-300-3
... which is subject to temperature increase. 6.3 Temperatures in Forging Operations In forging, the metal flow is non steady state. Contact between the deforming metal and the dies is intermittent. The length of contact time and the nature of the heat transfer at the die/material interface influence...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2000
DOI: 10.31399/asm.tb.aet.t68260029
EISBN: 978-1-62708-336-2
.... In actual hot extrusion practice, it is very difficult to obtain the velocity field inside the billet grid meridian plane. Saha ( Ref 14 ) assumed steady-state ram speed as the material speed of the billet at each grid point. The longitudinal grid method is normally used to study the velocity field at each...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610001
EISBN: 978-1-62708-303-4
... cracking and thus should be considered when predicting useful product life. brittle fracture fatigue cycles linear elastic fracture mechanics material defects stress intensity structural design IT IS OFTEN STATED that history repeats itself. Yet, when it comes to the failure of structural...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130133
EISBN: 978-1-62708-284-6
.... At characteristic stresses, the creep strain reaches a steady state in which the rate of straining is constant. This is called the steady-state creep rate, ε .     ( or     d ε . / d t ) . In hot working, the relationship between temperature ( T ), stress (σ), and strain rate...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110209
EISBN: 978-1-62708-247-1
... corresponding to a local temperature modulation of a few µK. Thus, it outperforms other thermal imaging methods, like liquid crystal imaging, fluorescent microthermal imaging, Raman IR-thermography, and steady-state IR thermography by 2 to 3 orders of magnitude. Thereby, LIT extends the application field...