1-20 of 191 Search Results for

steady-state mechanism

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
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
... crystal structure that provides an interstitial path for the migration of the relatively small carbon atoms. The article describes the evolution of steel microstructure with progressive decarburization (in air) to a steady-state carbon gradient using an iron-iron carbide phase diagram. It provides useful...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006453
EISBN: 978-1-62708-190-0
... features, characteristics, and limitations of these approaches. heat conduction signal-generation mechanisms steady-state configuration surface-excited thermography thermal nondestructive evaluation thermoelastic stress analysis vibrothermography THERMAL METHODS for nondestructive...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006464
EISBN: 978-1-62708-190-0
... surface. This article discusses the strategies for implementing thermography for NDE, including the steady-state/whole-body approach and transient heat conduction. It describes the most common signal-processing methods, such as thermographic signal reconstruction, lock-in thermography, and pulsed-phase...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.9781627081764
EISBN: 978-1-62708-176-4
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003025
EISBN: 978-1-62708-200-6
... superposition principle, which states that the mechanical response at long times at some particular temperature is equivalent to the mechanical response at short times but at some higher temperature. By determining shift factors, it is possible to determine which temperature to use in obtaining long-term data...
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
... deformation at a point begins when the maximum normal stress reaches the yield strength of the material. Tresca’s theory states that yield at a point begins when the maximum shear stress equals the shear stress in a tension specimen when it begins to yield. Another common failure model is the von Mises...
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
... (SSTG) are cast from 2.25Cr-1Mo steel and are designed to provide service for 30 years. The regions of the casings in the vicinity of the steam chest and the steam passageways are subjected to high transient thermal stresses during startup and to moderate steady-state mechanical stresses during...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001297
EISBN: 978-1-62708-170-2
... of 1 μm thickness. The activation energy at zero stress, Q 0 , for steady-state creep in unannealed, vapor-deposited copper films is about 1.3 eV. In sputtered 1 μm thick aluminum and aluminum-1% silicon-alloy films, Q 0 is 0.56 and 1.10 eV, respectively ( Ref 2 ). The low activation-energy...
Book Chapter

By Sammy Tin
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005404
EISBN: 978-1-62708-196-2
... discussed. In ponent materials that contain multiple phases or elements, the creep deformation mechanisms may differ from those already discussed. Particularly in alloys that are subject to microstructural changes during creep, the steady-state equations do not necessarily hold true. A...
Book Chapter

Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006790
EISBN: 978-1-62708-295-2
... Abstract Engineered components fail predominantly in four major ways: fracture, corrosion, wear, and undesirable deformation (i.e., distortion). Typical fracture mechanisms feature rapid crack growth by ductile or brittle cracking; more progressive (subcritical) forms involve crack growth by...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003225
EISBN: 978-1-62708-199-3
... stated above, their use herein is restricted to the macroscopic level. The cup-and-cone fracture shown at left in Fig. 1 occurred as a result of appreciable plastic deformation, and, thus, is a ductile fracture. On the other hand, the fracture shown at right in Fig. 1 is a brittle fracture. The...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
... reasons for brittle behavior of ductile materials include loading conditions and the internal state of stress created by the part geometry and the geometry of any imperfections in conjunction with the operating environment (chemically reactive and/or high or low temperature). The inherent ductile behavior...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006756
EISBN: 978-1-62708-295-2
...? What were the specified dimensions and tolerances for the as-manufactured part? How was the part installed? To what service environment(s) was the part exposed? Typical environments to examine include operating temperatures, stresses (steady state, cyclic), oxidizing/corrosive environments, and...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005669
EISBN: 978-1-62708-198-6
..., diffusionless (martensitic) phase transformation as occurs with face-centered cubic to hexagonal close-packed transformation in cobalt-chromium alloys, stacking faults and twins and their role in this transformation. It also includes strengthening mechanisms that are responsible for the mechanical properties of...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004020
EISBN: 978-1-62708-185-6
... steady-state saturation behavior. Figure 1 ( Ref 3 ) demonstrates the hardening behavior of 1100 aluminum deformed under several different modes. The hardening does not saturate but persists to high stresses at low hardening rate. Table 1 Stress-strain relations based on empirical...
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
... curves could be overlooked, unless accurate creep readings are taken at sufficiently close intervals, particularly during early stages of creep. Secondary creep is an equilibrium condition between the mechanisms of work hardening and recovery; it is also known as steady-state creep. As previously...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005275
EISBN: 978-1-62708-187-0
.... 2 Steady-state apparent viscosity, η, versus γ for AZ91D (various isothermals) Fig. 3 Steady-state apparent viscosity, η, versus γ for AM50 (various isothermals) Fig. 4 Steady-state apparent viscosity, η, versus γ for AM60 (various isothermals) Upon accumulating an...
Book Chapter

By Peter J. Blau
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003242
EISBN: 978-1-62708-199-3
... newly replaced bearings. The initial wear rate in that case is many times higher than the steady-state wear rate. In consideration of such effects, it is sometimes useful to subject the test specimens to a standard running-in or conditioning period and then make the first wear measurement, continuing...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006271
EISBN: 978-1-62708-169-6
... missing. Flow curves in the case of quenched aluminum alloys mean properties of undercooled states. The mechanical properties of these nonequilibrium microstructures are not available. Hot tensile tests of aluminum alloys can be performed at relevant temperatures, but their microstructures are near...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006829
EISBN: 978-1-62708-295-2
... within the contact before being ejected. This approach implies an initial transition period during which the debris layer is formed. When it stabilizes, the wear rate evolves toward a stable steady-state response where it is equal to the debris ejection flow and thus to the debris formation flow: (Eq...