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- W2002649432 abstract "An analysis is presented which shows that the strain (ɛ)/time (t) relation <disp-formula> <mml:math> <mml:mrow> <mml:mi>ɛ</mml:mi> <mml:mo>=</mml:mo> <mml:msub> <mml:mi>ɛ</mml:mi> <mml:mn>0</mml:mn> </mml:msub> <mml:mo>+</mml:mo> <mml:msub> <mml:mi>ɛ</mml:mi> <mml:mi>T</mml:mi> </mml:msub> <mml:mo>{</mml:mo> <mml:mn>1</mml:mn> <mml:mo>−</mml:mo> <mml:mtext>exp</mml:mtext> <mml:mo>(</mml:mo> <mml:mo>−</mml:mo> <mml:mi>t</mml:mi> <mml:mo>/</mml:mo> <mml:mi>τ</mml:mi> <mml:mo>)</mml:mo> <mml:mo>}</mml:mo> <mml:mo>+</mml:mo> <mml:msub> <mml:mrow> <mml:mover> <mml:mi>ɛ</mml:mi> <mml:mi>˙</mml:mi> </mml:mover> </mml:mrow> <mml:mi>s</mml:mi> </mml:msub> <mml:mi>t</mml:mi> </mml:mrow> </mml:math> </disp-formula> where ɛ0 is the instantaneous strain on loading, ɛ T the magnitude of transient creep, τ the relaxation time of transient creep, and έ s the steady-state strain rate, can be derived by assuming that transient and steady-state creep obey first-order reaction-rate theory. The assumption is considered to be reasonable at temperatures greater than about one half of the melting temperature where creep is diffusion-controlled, provided that one diffusion-controlled process only is governing deformation. When these conditions are satisfied, the proportionality observed experimentally, for a number of materials over a range of stresses and temperatures, between the initial strain rate έ i , steady-state strain rate έ s , and the relaxation frequency 1/τ is expected from the analysis. Departure from proportionality between 1/τ and έ s for type-316 stainless steel at low stresses is shown to be caused by the intrusion of a second process, in this case grain-boundary sliding, which contributes increasingly to deformation as stress is reduced. Evidence is also presented which shows that the above equation is an adequate description of creep strain after stress has been reduced during a test, indicating that dislocation structures formed at one stress can rearrange at another stress according to first-order kinetics. Finally, it is suggested that the product, έ s t, can be regarded as a stress/time/temperature parameter that can be used to correlate both creep strain and time to rupture of materials over the ranges of stress and temperature where the analysis applies." @default.
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- W2002649432 title "A Relationship between Transient and Steady-State Creep at Elevated Temperatures" @default.
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- W2002649432 doi "https://doi.org/10.1179/msc.1969.3.1.221" @default.
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