Activation processes of stress relaxation during hold time in 1Cr–Mo–V steel

Jeong, Chang-Yeol; Nam, Soo Woo; Ginsztler, János

doi:10.1016/s0921-5093(98)01086-7

Cited by 42 publications

(16 citation statements)

References 19 publications

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“…While these activation volume is much larger than those obtained for ionic transport, they are comparable to those obtained for water diffusion [19,20]. Even greater activation volumes were reported for creep of PMMA [56] as well as for stress relaxation of steel [57]. Using the activation volume of 100 cm 3 /mol in Eq.…”

Section: Discussionsupporting

confidence: 47%

Surface structural relaxation of silica glass: a possible mechanism of mechanical fatigue

Tomozawa

Hepburn

2004

Journal of Non-Crystalline Solids

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Section: Discussionsupporting

confidence: 47%

Surface structural relaxation of silica glass: a possible mechanism of mechanical fatigue

Tomozawa

Hepburn

2004

Journal of Non-Crystalline Solids

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“…4(a) and (b) show typical examples of Coffin-Manson plots for 1Cr-Mo-V steel and AISI 321 stainless steel. In these plots, the fatigue lives with hold time were observed to be reduced as hold time increased; this phenomenon coincides with many studies [1][2][3][4][5][6] where fatigue lives under creepfatigue interaction conditions decreased with increasing hold time. In this plot, each straight line is required to represent the particular relationship between plastic strain range and fatigue life at each hold time.…”

Section: Plots Of Coffin-manson Relationsupporting

confidence: 89%

“…In low-cycle fatigue tests, it has been reported that as hold time increases, fatigue life decreases at a fixed test temperature [1][2][3], and the reason for life reduction is reported to be due to the creep effect of stress relaxation, which makes an additional plastic strain enlarging the hysteresis loop during hold time [4][5][6]. It has become apparent that fatigue life under the creep-fatigue interaction condition depends not only on the testing temperature but also on the stress wave shape with hold time.…”

Section: Introductionmentioning

confidence: 99%

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Normalized coffin-manson plot in terms of a new life function based on stress relaxation under creep-fatigue conditions

2003

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A new life prediction function based on a model formulated in terms of stress relaxation during hold time under creep-fatigue conditions is proposed. From the idea that reduction in fatigue life with hold is due to the creep effect of stress relaxation that results in additional energy dissipation in the hysteresis loop, it is suggested that the relaxed stress range may be a creep-fatigue damage function. Creep-fatigue data from the present and other investigators are used to check the validity of the proposed life prediction equation. It is shown that the data satisfy the applicability of the life relation model. Accordingly, using this life prediction model, one may realize that all the Coffin-Manson plots at various levels of hold time in strain-controlled creepfatigue tests can be normalized to make one straight line.

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“…In the plastic range, total strain can be decomposed into elastic and plastic components; in order to maintain a constant level of strain, plastic deformations must increase relative to elastic deformations [17]. Reductions in the elastic strain component results in a reduction in the stress under constant total strain; this is known as stress relaxation.…”

Section: Testing Conditionsmentioning

confidence: 99%

Practical strain-hardening material properties for use in deformation-based structural steel design

Foster¹,

Gardner

Wang³

2015

Thin-Walled Structures

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Through the development of an innovative full cross-section tensile testing method, a programme of experiments was conducted to investigate the influence of average cross-section properties on the constitutive relationships for carbon steel, to validate the use of an elastic linear hardening model in practical design, and to assess the resulting accuracy enhancements to the new deformation-based Continuous Strength Method (CSM) of structural steel design. A total of seventeen full cross-section tensile tests on hot-rolled I-sections, hollow sections and cold-formed hollow sections were performed and these were compared with coupon test data obtained from a supplementary programme of fourteen tensile coupon tests and data carefully obtained from the literature. The overall behavioural response of the crosssection tensile tests demonstrated that assuming an elastic, linear hardening material model for the CSM is a reasonable assumption and the previous assumption concerning the magnitude of the strain-hardening modulus, based upon the recommendations of EN 1993-1-5, is overly-conservative. A revised suite of material models was presented and was shown to furnish the CSM capacity equations with a higher degree of accuracy when compared against experimental data.

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Activation processes of stress relaxation during hold time in 1Cr–Mo–V steel

Cited by 42 publications

References 19 publications

Surface structural relaxation of silica glass: a possible mechanism of mechanical fatigue

Surface structural relaxation of silica glass: a possible mechanism of mechanical fatigue

Normalized coffin-manson plot in terms of a new life function based on stress relaxation under creep-fatigue conditions

Practical strain-hardening material properties for use in deformation-based structural steel design

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