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stress relaxation

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780199
EISBN: 978-1-62708-281-5
... Abstract This article describes the general aspects of and practical problems of failure analysis of creep, stress relaxation, and yielding for homogeneous polymers. The effect of temperature and strain rate on the relationship between yield point and elastic modulus and the aging effect...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780055
EISBN: 978-1-62708-281-5
... for predicting plastic 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. plastics material selection materials design plastic parts stiffness impact...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780314
EISBN: 978-1-62708-281-5
... Abstract This article describes the mechanisms of moisture-induced damage in polymeric materials, covering the characteristics of important structural plastics; the effects of moisture on glass transition temperature, modulus, creep, and stress relaxation of plastic materials; and moisture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540281
EISBN: 978-1-62708-309-6
... Abstract Large-scale yielding at the crack tip and time-dependent crack growth mechanisms, such as stress relaxation due to creep, are nonlinear behaviors requiring nonlinear analysis methods. This chapter presents two such methods, one based on elastic-plastic fracture mechanics, the other...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080379
EISBN: 978-1-62708-304-1
... in 321 Stainless Steel , Mater. High Temp. , Vol 15 ( No. 3/4 ), 1998 , p 395 10.1080/09603409.1998.11689628 26. Li L. and Messler R.W. , Stress Relaxation Study of HAZ Reheat Cracking in Type 347 Stainless Steel , Weld. J. , 2000 , p 137s 27. Christoffel R.J...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490265
EISBN: 978-1-62708-340-9
.... Jones G.T. , Proc. Institute of Mechanical Engineers , Vol 186 , 1972 , p 31 - 32 22. Timo D.P. , “ Design Philosophy and Thermal Stress Considerations of Large Fossil Steam Turbines, ” General Electric Fossil Steam Turbine Seminar , Schenectady, NY , Publication 84T16, 1984...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780295
EISBN: 978-1-62708-281-5
... Stresses in Polyethylene as Related to Its Structure , Mater. Sci. Eng. , Vol 19 , 1975 , p 185 10.1016/0025-5416(75)90105-6 18. Kubát J. and Rigdahl M. , A Simple Model for Stress Relaxation in Injection Molded Plastics with an Internal Stress Distribution , Mater. Sci. Eng...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780204
EISBN: 978-1-62708-281-5
... ) is the time-dependent stress, and ε 0 is the constant applied strain. This behavior, commonly referred to as stress relaxation, is a result of the polymer molecules sliding past each other, which allows the stress to decrease under the applied strain. Figure 1 is a plot of the logarithm of the stress...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080001
EISBN: 978-1-62708-304-1
... cause the alloy to suffer brittle, intergranular cracking when exposed to the lower end of the intermediate temperatures for certain alloys. This type of cracking is frequently referred to as “reheat cracking,” “stress-relaxation cracking,” or “strain-age cracking” (for nickel-base alloys). Both...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780105
EISBN: 978-1-62708-281-5
.... As a result of time and temperature, the macromolecular network will eventually undergo stress relaxation. The attendant distortion, warpage, and dimensional instabilities are directly related to the degree of “cruelty” suffered in processing. The consequences of processing at all stages must be addressed...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780343
EISBN: 978-1-62708-281-5
.... Evaluate the sample, in nitrogen, by DSC (or TMA) from –100 to 120 °C (–150 to 250 °F). Determine the T g and any other transitions associated with the thermal history of the sample, such as moisture evolution or stress-relaxation exotherms. Reweigh the sample, and reexamine it under the microscope...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.9781627082815
EISBN: 978-1-62708-281-5
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780305
EISBN: 978-1-62708-281-5
... as follows. Just as in glassy plastics, orientation significantly improves the ESC resistance of nylons in the direction of stress ( Ref 39 ). However, it has been found that slight orientation with subsequent relaxation reduces failure times, presumably because of the expansion and coalescence...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.9781627083195
EISBN: 978-1-62708-319-5
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.tb.hpcspa.t54460121
EISBN: 978-1-62708-285-3
.... Evaluating the coating residual stress and the coating relaxation behavior after thermal treatments becomes imperative to establish the reliable functionality of the coating for the proposed application. Microstructural characterization methods including optical microscopy, scanning electron microscopy...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090367
EISBN: 978-1-62708-266-2
... concentrations interact and are relaxed. Consequently, there may not be a sufficient stress concentration in the true constant-strain test (infinitely stiff fixture) to propagate further SCC, and the specimen will not break ( Fig. 17.5b ). Under a constant load, however, the growth of many cracks continues...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780146
EISBN: 978-1-62708-281-5
... creep, stress relaxation, and creep (stress) rupture. Both categories of properties are affected by exposure to external chemical environments. With any polymeric material, chemical exposure may have one or more different effects. Some chemicals act as plasticizers, changing the polymer from one...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490111
EISBN: 978-1-62708-340-9
...Abstract Abstract This chapter describes the phenomenological aspects of fatigue and how to assess its effect on the life of components operating in high-temperature environments. It explains how fatigue is measured and expressed and how it is affected by loading conditions (stress cycles...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000001
EISBN: 978-1-62708-313-3
... on the auxiliary components, with alloys such as MP35N, MP159, Inconel X750, and Inconel 751 being developed specifically for applications where stress relaxation is to be avoided (for example, bolts, springs, and other fasteners) ( Ref 18 ). Fig. 1.1 Environmental resistance and strength for various...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630035
EISBN: 978-1-62708-270-9
... after being torch cut at each end the previous day ( Ref 1 ). It suddenly split longitudinally, as shown in Fig. 1 . This fracture was caused by residual stress. Note the bowing of the beam as the transverse stresses relaxed following fracture. The extremely high forces involved can be imagined...