Stress Relaxation and the Plastic Deformation of Solids

Guiu, F.; Pratt, P. L.

doi:10.1002/pssb.19640060108

Cited by 295 publications

(79 citation statements)

References 8 publications

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“…Further, the recovery process will be discussed based on the network growth model (13). (2) where K is the apparent Young's modulus of the specimen including the elastic deformation of the machine assembly and given by (14) …”

mentioning

confidence: 99%

Reliability of Experimental Values for Work-Hardening and Recovery Rates in Pure Aluminum during High Temperature Deformation

1986

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In order to clarify the origin of considerable discrepancies among the reports on the work-hardening rate without dynamic restoring effect, h, and the softening rate without work-hardening effect, r, the two parameters have been measured by three different techniques; stress change, strain rate change and stress relaxation tests. These techniques have been applied to high-temperature steady-state deformation of pure aluminum specimens with the same production history, and it has been examined whether the discrepancies come from the difference in production history or the difference in experimental technique. It is found that h values for the same deformation state agree with one another within 30 per cent and r values within 20 per cent. The differences are much smaller than those found among the reports.It is concluded that the disagreements found in the previous reports are caused not by the difference in test technique but by the difference in production history of specimens.

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confidence: 99%

Reliability of Experimental Values for Work-Hardening and Recovery Rates in Pure Aluminum during High Temperature Deformation

1986

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“…Two methods have been widely used for the study of small deformations : one is the stress relaxation technique [2], the other consists in stress cycling [3].In the latter the microelastic, anelastic and macroelastic critical stresses are defined. In the preyield domain the cycles are not closed, i.e some residual deformation is obtained (cf.…”

Section: The Preyield Behaviour Of Bcc Metals -mentioning

confidence: 99%

Exhaustion mechanisms in the Preyield domain of niobium single crystals at low temperatures

Böudet

Kubin

1975

J. Phys. France

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“…Case II in which the frictional stress is negligible When the frictional stress is negligibly small and the flow stress can be determined by the internal stress, (10) Thus, the Orowan's relationship (6) is obtained: (11) h is the coefficient of strain hardening without recovery and r is the rate of recovery without strain hardening with recovery derived directly from stress-strain curves, using eq. (11): (12) Introducing the constraining eq. (7) into eq.…”

Section: Introductionmentioning

confidence: 99%

A Method of Discerning Frictional Stress and Internal Stress by the Stress Relaxation Test

1977

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Applicability of the stress relaxation test as a method of discerning frictional stress and internal stress is examined theoretically. It is found that the strain rate should change continuously on the onset of stress relaxation when an appreciable amount of frictional stress exists, while the strain rate should change discontinuously at the starting point of the stress relaxation when the frictional stress is negligibly small or the internal stress is the dominant component of the flow stress. Whether the contribution of the frictional stress to the flow stress is appreciable or not, can therefore be determined by comparing the strain rates immediately before and after the start of the stress relaxation.By applying this method to the experiment of high-temperature deformation of metals and alloys, the following results are obtained : In pure aluminum and vanadium, the frictional stress is negligibly small, that is, the flow stress is almost equal to the internal stress. Meanwhile, in solutionhardened alloys, Al-5.7 at %Mg and V-5.0 at %Fe, the frictional stress appreciably contributes to the flow stress.Merits and demerits of the proposed method are discussed comparing with the usual methods for measuring the internal stress.

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Stress Relaxation and the Plastic Deformation of Solids

Cited by 295 publications

References 8 publications

Reliability of Experimental Values for Work-Hardening and Recovery Rates in Pure Aluminum during High Temperature Deformation

Reliability of Experimental Values for Work-Hardening and Recovery Rates in Pure Aluminum during High Temperature Deformation

Exhaustion mechanisms in the Preyield domain of niobium single crystals at low temperatures

A Method of Discerning Frictional Stress and Internal Stress by the Stress Relaxation Test

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