“…For finding the thermal creep stresses and strain rates, the transition function is taken through principal stress difference (see SETH, 1962SETH, , 1966SETH, , 1970SETH, , 1972SETH, , 1974GUPTA et al 1979GUPTA et al , 1981GUPTA et al , 2008SHKULA, 1996;SANJEEV et al, 2010SANJEEV et al, , 2013DEEPAK et. al.…”