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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 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...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870075
EISBN: 978-1-62708-344-7
... materials and their fatigue behaviors. It then discusses the challenge of developing hysteresis loops for complex loading patterns and accounting for effects such as ratcheting and stress relaxation. The sections that follow provide a summary of the various ways mean stress is described in the literature...
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 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...
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 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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060223
EISBN: 978-1-62708-343-0
... to improve the creep-fatigue behavior of these otherwise promising materials. It addresses six areas that have been the focus of intense research, including thermal-expansion and elastic-viscoplastic mismatch, thermally induced biaxiality and interply stresses, creep and cyclic relaxation of residual...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080379
EISBN: 978-1-62708-304-1
.... , 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. , Notch-Rupture Strength of Type 347 HAZ...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490265
EISBN: 978-1-62708-340-9
... observed in many instances ( Ref 8 and 13 ). No clear evidence of creep damage in the bore has been documented, although concern remains regarding the possibility of crack initiation by this mechanism at the bore. In the high-temperature regions of HP/IP rotors, the relaxed long-term bore stresses...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060111
EISBN: 978-1-62708-343-0
... . Since the test was conducted at a constant temperature of 650 °C (1200 °F), only this temperature is reflected in Fig. 6.2(b) to (d) . Figure 6.2(a) shows the strain pattern imposed at the test condition, and Fig. 6.2(e) is the stress-strain response, showing the stress relaxation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780295
EISBN: 978-1-62708-281-5
... motion. The approach to equilibrium gives rise to what is called physical aging. The net result is a slow contraction of material. This contraction relieves the internal stresses. The dimensional changes here are not as pronounced as those that result from the relaxation of thermal or orientation...
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
... 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 relaxation modulus, E ( t ), as a function of log time (or temperature) for an amorphous thermoplastic material...
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...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.tt2.t51060115
EISBN: 978-1-62708-355-3
...-rate) dependent and may produce damping or internal friction in a metal or alloy subjected to cyclic or vibratory loads. Anelastic strains are one cause of stress relaxation in a tensile test when the test specimen is loaded and held at a fixed displacement. This stress relaxation is frequently called...
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
... ). With these methods, the following physical properties have been determined: T g , T c (the temperature at which crystallization occurs at a maximum rate), exothermic heat of polymerization or cure, T m , heat of fusion, exothermic heat of stress relaxation, specific heat as a function of temperature, thermal...
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 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870267
EISBN: 978-1-62708-344-7
... that concentrate strains, preventing or removing surface damage, and by inducing compressive mean stresses that prolong fatigue life. It also discusses the use of property conditioning and restoration treatments, the benefits of interference fits and processes such as coaxing, the effects of assembly damage...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780305
EISBN: 978-1-62708-281-5
... 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 of preexisting microcracks. Although average molecular weight does not appear to make...
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 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090367
EISBN: 978-1-62708-266-2
...Stressing methods applicable to various sources of sustained tension in service Table 17.1 Stressing methods applicable to various sources of sustained tension in service Source of sustained tension in service Constant strain Constant load Residual stress Quenching after heat...