Issue 48

J. Christopher et alii, Frattura ed Integrità Strutturale, 48 (2019) 554-562; DOI: 10.3221/IGF-ESIS.48.53

[19] Praveen, C., Christopher, J. and Choudhary B. K. (2017). Critical Assessment of Short-Term Stress-Relaxation Studies for the Prediction of Creep Properties of P91 Steel, Trans. Ind. Inst. Met., 70 (3), pp. 655-660. DOI:10.1007/s12666-017-1090-1.

N OMENCLATURE

     

Total appliedstrain rate

b

Burgers vector

t

Elasticstrain rate Inelasticstrain rate

M Taylorsfactor

e

s, and t Constants involved in Model-I 

in

0

 

t

Hold time

Initial relaxationstress

r0

r rnal stress C Effectivemodulusof sample-machinesystem m Power law exponent Characteristicstrain rate h Power law co-efficient Mobiledislocation density Shear modulus Q Activation energy R Gas constant Internal stress       D Debyefrequency V Activation volume k Boltzmann's constant T Temperature  i0 Relaxationstress Initial inte  0 m i

562

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