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creep experiments

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Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003024
EISBN: 978-1-62708-200-6
..., and the effect of viscoelasticity on the test methods used. Two common ways of evaluating viscoelasticity of plastics are by means of creep experiments and dynamic mechanical experiments. Graphic or tabular analysis of test data, time-temperature superposition, and empirical correlation methods are commonly...
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
... behavior of a plastic component. The relevant time scale of interest can be examined experimentally by conducting very long time scale creep experiments for constant load behavior or shorter time scale dynamic mechanical experiments in order to apply a time-dependent viscoelastic continuum mechanics model...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003286
EISBN: 978-1-62708-176-4
... acquisition and control. Creep deformation and rupture experiments are used to determine the strength and lifetime of materials under quasi-static conditions at elevated temperatures. This testing typically involves imposing constant stress or displacement conditions as well as a constant elevated...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003288
EISBN: 978-1-62708-176-4
... experiments measure the deformation as a function of time to failure. If strain-time behavior is measured, but the test is stopped before failure, this is termed an interrupted creep experiment . Finally, if an inadequate strain-measuring system or no attempt to determine length is employed, and the test...
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...
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
...” and time for lead. In 1905, Phillips ( Ref 2 ) detailed the creep experiments of copper, platinum, silver, gold, and steel wires and opined that a logarithmic dependence between stretch and time existed for copper, platinum, silver, and gold wires, but the behavior of steel wires did not follow the same...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005411
EISBN: 978-1-62708-196-2
... In the past, some limited elevated-temperature hold-time studies have been performed in vacuum to investigate the relative contribution of the environment and creep deformation to the crack growth rate. The results of these studies are briefly described to illustrate how useful some of these experiments can...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002391
EISBN: 978-1-62708-193-1
... fatigue damage was predicted from creep-rupture data for these experiments. Fujino and Taira ( Ref 63 ) demonstrated that for type 304 stainless steel (at 200 to 750 °C, or 390 to 1380 °F) the TMF IP lives were shorter than the TMF OP case by nearly a factor of four. Their results are shown in Fig...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003292
EISBN: 978-1-62708-176-4
... that there is excellent agreement between the two experimental procedures over intermediate stresses (and intermediate strain rates). In obtaining the data for Fig. 6 , the creep machine (constant-stress and stress-change experiments) was primarily used to establish the deformation at low and intermediate stresses...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005506
EISBN: 978-1-62708-197-9
... on stress relief through relaxation of stresses, the experiments, physical understanding of deformation mechanisms, and theoretical models are usually cast as creep models instead of relaxation models. Hence, the following discussion is focused on creep deformation mechanisms and their associated models...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002389
EISBN: 978-1-62708-193-1
... to extensive creep conditions for creep-ductile materials. The average value of C t , ( C t ) avg , is used for characterizing the average crack growth rate, ( da / dt ) avg , in creep-fatigue experiments ( Ref 56 , 57 , 58 , 59 , 60 ). The value of ( C t ) avg is determined by two methods...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002472
EISBN: 978-1-62708-194-8
..., in a comprehensive study of creep in copper and aluminum, Wyatt ( Ref 3 ) concluded that there are two types of transient creep in metals: At higher temperatures, beta creep predominates as in Andrade's experiments. At lower temperatures, the strain is proportional to log(time), and the flow is referred...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005512
EISBN: 978-1-62708-197-9
.... The Hamilton model was based on plastic deformation and creep, and favorable agreement between experiment and prediction was found for the titanium alloy Ti-6Al-4V. Figure 3 shows the calculated bond pressure requirements evaluated as a function of bonding time. However, in such an alloy and with the assumed...
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Published: 01 January 1997
Fig. 29 Diffusional creep results from a higher vacancy concentration in regions of a material that experience a tensile stress compared to regions that do not. This results in a vacancy flux from the former to the latter areas, and a mass flux in the opposite direction. This extends More
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
... time at temperature curves can be generated and combined with short-term creep and tensile data to predict the long-term properties. Fatigue Testing Polymeric materials used in products that experience cyclical loading from stresses such as pressure, temperatures, or assembly stresses can...
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
... = 0, ω = 0 and this equation is then identical to the Norton power law; however, as damage (ω) increases, the creep rate increases (tertiary creep) as expected (and confirmed from experiments). Failure occurs when ω = 1, at which point the strain rate tends toward infinity. The damage rate is given...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003291
EISBN: 978-1-62708-176-4
...: Creep stress analysis for a cylindrical body gives always the maximum effective stress values on the inner surface of the tube. The service experience shows that the creep damage always appears on the outer surface of the tube—at least for materials other than the most brittle ones. Ratio...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003545
EISBN: 978-1-62708-180-1
... of creep exposure prior to actual use is sometimes necessary, where tested and untested materials are examined and compared. Complete microstructural examination should be an essential part of any creep experiment and failure investigation. At a minimum, microstructure and phase identification should...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003256
EISBN: 978-1-62708-176-4
... ( Table 7 ). The following sections briefly describe the test methods and comparative data for the mechanical property tests listed in Table 7 . In addition, creep testing and dynamic mechanical analyses of viscoelastic plastics are also briefly described. For more detailed descriptions of these test...
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
... in predicting relaxation from creep data and vice versa. The problem is that most structural materials experience strong deformation path dependence. Thus, a material creeping under constant load and accumulating strain experiences a different deformation path from one subjected to a fixed total strain...