The creep fracture of copper and magnesium

Needham, N. G.; Wheatley, J.E; Greenwood, G. W.

doi:10.1016/0001-6160(75)90065-6

Cited by 46 publications

(9 citation statements)

References 10 publications

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“…In practice, this relation has generally been found not to hold and the time to facture has been noted to be a much higher power of the applied tensile stress (Feltham & Meakin 1959). A further discrepancy between this theory and experiment has been that quite often (Woodford 1969;Needham, Wheatley & Greenwood 1975) the volume increase due to cavitation in creep is given by a formula of the type AF/Fcc etcrn. This contrasts with the equation crt that would be expected to hold on the theory so far stated.…”

Section: T He Grow Th Of Cavitiesmentioning

confidence: 97%

Fracture during creep

Greenwood

1978

Phil. Trans. R. Soc. Lond. A

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Although materials generally become more ductile with increase in temperature and decrease in strain rate, many metals have a local minimum in ductility at specific temperatures and strain rates. There is thus a region where a decrease in stress level results in a decrease of elongation before fracture. Failure is observed to occur at interfaces and particularly at grain boundaries nearly perpendicular to the maximum principal tensile stress. The nucleation of cavities and cracks, however, appears to arise initially from shear processes at these interfaces at temperatures and stresses where grain boundary sliding is significant but transverse boundary movement is negligible. Thus, tensile and shear stresses play different roles. Since cavities have a finite volume and link together to cause failure, the hydrostatic component of stress is important and so, in evaluating criteria for fracture, a precise definition of the stress system is necessary. Further, chemical composition, segregation and microstructural features play a vital role and materials that are only slightly different may show quite dissimilar behaviour.

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Section: T He Grow Th Of Cavitiesmentioning

confidence: 97%

Fracture during creep

Greenwood

1978

Phil. Trans. R. Soc. Lond. A

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“…The effective stress may lead to their nucleation, while subsequent growth is dependent on the maximum tensile stress. The latter promotes the stress-induced flow of vacancies to voids [34], and these grow preferentially on boundaries having high tensile stress acting on them and, indeed, their formation can be suppressed by superposition of hydrostatic compressive stress [35]. At lower levels of Intergranular fracture may also take place under monotonic loading at ambient temperatures in embrittled materials.…”

Section: Intergranular Fracturementioning

confidence: 99%

Failure Mechanisms and Metallography: A Review

May

1978

Metallography in Failure Analysis

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“…The formation of cavities in many materials undergoing creep is a well-known phenomenon [7][8][9][10]. It is also well known that cavities will reduce the elastic moduli of solids [11,12].…”

Section: Introductionmentioning

confidence: 99%

Elastic creep of stressed solids due to time-dependent changes in elastic properties

Venkateswaran

Hasselman

1981

J Mater Sci

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The suggestion is made that creep in solids can occur by time-dependent changes in elastic properties. Specific mechanisms include cavity formation and growth, crack nucleation and growth, grain boundary migration in polycrystalline solids with elastically anisotropic grains and the redistribution of the individual phases within a composite. Creep rates by these four mechanisms are analysed and discussed for simple mechanical models. Recommendations are made for the interpretation of creep data in order to clearly separate the contribution of elastic creep from the total creep deformation.

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The creep fracture of copper and magnesium

Cited by 46 publications

References 10 publications

Fracture during creep

Fracture during creep

Failure Mechanisms and Metallography: A Review

Elastic creep of stressed solids due to time-dependent changes in elastic properties

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