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relaxation time

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Published: 01 October 2014
Fig. 8 Effects of the stress-relieving temperature and time at relaxation temperature on the residual stress in a high-strength gray iron containing alloys that assist in retaining strength at elevated temperatures. Courtesy of the American Foundry Society. Source: Ref 7 More
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Published: 01 January 1990
Fig. 12 Effect of time and temperature on the relaxation of ten-turn helical springs made from (a) music wire per ASTM A 228 and (b) 420 and 431 stainless steel wire. Wire diameter, 2.69 mm (0.106 in.); spring diameter, 25.4 mm (1.00 in.); free length, 76.2 mm (3.00 in.). Stresses were More
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Published: 31 August 2017
Fig. 8 Effects of the stress-relieving temperature and time at relaxation temperature on the residual stress in a high-strength gray iron containing alloys that assist in retaining strength at elevated temperatures. Courtesy of the American Foundry Society. Source: Ref 10 More
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Published: 01 January 1997
Fig. 31 Comparison of predicted time to 0.5% creep based on stress-relaxation measurements at 650 °C (1200 °F) for an austenitic iron-base alloy with measurements made on conventional creep tests. SRT, stress-relaxation tests More
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001750
EISBN: 978-1-62708-178-8
... electrons to return to equilibrium from their resonant state. Two of the most common methods for measuring this relaxation time are presented as are several application examples. crystallographic anisotropy electron spin ESR magnetic resonance paramagnetic resonance relaxation time Overview...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003435
EISBN: 978-1-62708-195-5
... that are attached to polymer-backbone molecules will rotate to align themselves with the field. The time required for dipoles to align fully with the field is a characteristic of the dipole mobility and is referred to as the relaxation time, τ. The relaxation time is influenced by the following factors: temperature...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001752
EISBN: 978-1-62708-178-8
... as the Knight shift. In many metals, the Knight shift arises primarily from the conduction electron paramagnetism. Relaxation times are also determined by the electrons at the Fermi level, which induce nuclear spin flips. In magnetically ordered materials, an internal magnetic field can be measured...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006941
EISBN: 978-1-62708-395-9
... to zero in the same nearly instantaneous time. A viscoelastic material would behave in a manner such that the initial stress is realized, but reduced as a function of time that is neither constant nor instantaneous. As such, stress relaxation behavior may be generalized as: (Eq 5) σ ( t...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006934
EISBN: 978-1-62708-395-9
... method, one of the most common to describe the material deformation and rupture time, is also discussed. Burgers power-law model creep failure Findley power-law model Larson-Miller parametric method material deformation polymers rupture time service life stress relaxation time-stress...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005913
EISBN: 978-1-62708-167-2
... the influence of temperature. The typical time between two flips is called the Néel relaxation time. In the absence of an external magnetic field, when the time used to measure the magnetization of the nanoparticles is much longer than the Néel relaxation time, their magnetization appears to be in average zero...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002477
EISBN: 978-1-62708-194-8
... in this article. Simple tools and techniques for predicting part performance (stiffness, strength/impact, creep/stress relaxation and fatigue) integrated with manufacturing concerns (flow length and cycle time) are demonstrated for design and material selection. Engineering plastics are now used...
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
... 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 remaining-life...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006932
EISBN: 978-1-62708-395-9
... are further determined by m = HL /(thermal diffusivity), where m is the dimensionless Biot number, H is a convective heat-transfer coefficient, and 2 L is the sample thickness. To simplify the model, the researcher neglected time-temperature effects on mechanical properties, volume relaxation...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003290
EISBN: 978-1-62708-176-4
..., but since the total strain is held constant, this can only be achieved if the elastic strain decreases with a corresponding decrease in the stress. Creep at a fixed total strain, therefore, results in a time dependent stress relaxation. A common practical example where stress relaxation is a major...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003136
EISBN: 978-1-62708-199-3
... stress is applied to a piece of metal, it reacts by developing an equal and opposite internal stress. If the metal is held in this strained position, the internal stress will decrease as a function of time. This phenomenon is called stress relaxation and happens because of the transformation of elastic...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003024
EISBN: 978-1-62708-200-6
... in conjunction with the elementary facts about molecular relaxation times, the experimenter has a framework against which any mechanical test procedure can be set, and when there are experimentation options, the most appropriate one can be chosen. There are regions in which a property such as modulus is not very...
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Published: 01 January 1997
Fig. 31 The variation of the relaxation drop with cycles for a test with a strain range of 3% and a hold time of 100 min. Material A6; push-pull test. Dwell time: 42 cycles at 100 min. E t = 1.49%. Source: Ref 70 More
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Published: 01 January 2001
Fig. 6 Viscoelasticity as shown by the creep and stress relaxation behavior over time More
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Published: 30 August 2021
Fig. 27 Plot of von Mises stress as a function of time in the element with the highest predicted creep damage, showing stress relaxation More
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Published: 30 August 2021
Fig. 34 Stress relaxation in carbon steels as a function of postweld heat treatment temperature and hold time. Adapted from Ref 160 More