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stress relaxation

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001814
EISBN: 978-1-62708-241-9
..., setting off the fire. The failure mechanisms include stress relaxation cracking of a large diameter Incoloy 825 tube, stress rupture of a 4.65 in. thick chromium steel shell wall, and the oxidation of chromium steel exposed to hot syngas. The gasifier process and operating conditions that contributed...
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
... Abstract This article describes the general aspects of creep, stress relaxation, and yielding for homogeneous polymers. It then presents creep failure mechanisms in polymers. The article discusses extrapolative methods for the prediction of long-term creep failure in polymer materials...
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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
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Published: 30 August 2021
Fig. 11 Representative micrographs showing stress-relaxation cracking adjacent to a weld in a type 304H stainless steel thick-walled pressure vessel. Original magnification: (a) 25×, (b) 200×. Electrolytically etched with 10% oxalic acid solution More
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Published: 15 May 2022
Fig. 11 Stress relaxation curve for high molecular weight polyethylene (HMWPE) More
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Published: 15 May 2022
Fig. 5 Simplified schematic of creep and stress-relaxation behavior in polymeric materials. Adapted from Ref 32 , 33 More
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
... temperatures. The article describes the stages of the creep curve, discusses processes involved in the extrapolation of creep data, and summarizes notable creep constitutive models and continuum damage mechanics models. It demonstrates the effects of stress relaxation and redistribution on the remaining life...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0090433
EISBN: 978-1-62708-218-1
... produced a greater predisposition for stress relaxation. Additives Chemical composition Clips Injection moldings Molding resins Stress relaxation Thermal analysis Wire clips Nylon 6/6 (Other, general, or unspecified) processing-related failures A production lot of plastic wire clips...
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
... Abstract The principal types of elevated-temperature mechanical failure are creep and stress rupture, stress relaxation, low- and high-cycle fatigue, thermal fatigue, tension overload, and combinations of these, as modified by environment. This article briefly reviews the applied aspects...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006929
EISBN: 978-1-62708-395-9
... materials and resins. It explains how absorbed moisture affects a wide range of properties, including glass transition temperature, flexural and shear modulus,creep, stress relaxation, swelling, tensile and yield strength, and fatigue cracking. It provides relevant data on common polymers, resins, and fiber...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001590
EISBN: 978-1-62708-228-0
... or stress relaxation cracking. This had not previously been reported for an application of Alloy 601. However, the subsequent investigations showed that Alloy 601 at a temperature between 600 and 650 °C (1110 and 1200 °F) will develop carbon precipitation that over time (in this case, one year) reduces...
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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
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 Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001760
EISBN: 978-1-62708-241-9
... lengths during the test were measured by ultrasonic device. Stress relaxations were calculated and are shown in Table 1 . The results show that after the running-in test, the bolt lengths increase and then decrease because of stress relaxation. The changes in lengths were symmetric. Stress relaxation...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006930
EISBN: 978-1-62708-395-9
... and a dashpot in series. This model is appropriate for experiments in which deformation is the controlled parameter, such as stress relaxation, where an instantaneous deformation is applied and the resultant force or torque is monitored as a function of time. In the Kelvin–Voigt model, the spring and dashpot...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003528
EISBN: 978-1-62708-180-1
... (0.08 in.) hole. X-ray diffraction residual-stress measurements at locations where access is a problem normally require sectioning of the component to access the location of interest and, in general, require the evaluation of applied stresses caused by the relaxation due to sectioning. The most common...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006768
EISBN: 978-1-62708-295-2
... inadequately represent the statistical distribution of residual stresses in the component population. Components that have already failed may be of limited use, because residual stresses may have changed or relaxed considerably upon failure. In certain instances, a map of the residual stresses as a function...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001487
EISBN: 978-1-62708-234-1
..., a certain measure of creep and stress relaxation takes place. Under a slow rate of loading, the occurrence of creep will result in an increase in the amount of plastic strain, while at temperature, relaxation will cause the stress to decrease with time due to plastic flow of the copper. As a consequence...
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
... that result from the relaxation of thermal or orientation stresses. Nonetheless, mechanical properties are significantly affected by the aging process. Deformation by swelling can generate similar internal stresses. Categorically, these three types of stresses are defined as separate entities. It must...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006921
EISBN: 978-1-62708-395-9
... in transparency Creep-rupture from constant load (creep) Odor development Chemical or environmental stress cracking (ESC) Loss of adhesion Loss of mechanical seal (stress-relaxation) Shrinkage/warpage Cracking from cyclic loading (fatigue) Once the type of failure needing to be assessed...