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invalid creep strain for isochronous stress-strain curve

YuJie_PV

Mechanical
Joined
Jan 19, 2017
Messages
166
Location
CN
Hi, all experts,

i encounter a problem when developing an isochronous stress-strain curve as indicated in para. 5.6.3(b) of VIII-2 2025 edition with an EXCEL spreadsheet.
the creep strain resulted from equation as below is always in error, because (1-epsilon_co*omega*t) calculated is always negative.
1754137344150.png
I've tried to solve it myself,, and checked the formulas entered time and again, but failed.
i've guessed the problem most possibly lie with the unit used for those parameters, i checked but unable to which one is wrong.
time t in above equation i entered is 100 000, unit is hours. is it correct?

1754147062284.png
please help me check out.
any reply appreciated. thanks.
 

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