1
مکانیک::
دامنه تنش
A number of cumulative damage theories have been proposed in making estimates of the life of a blade subjected to variable stress amplitude (Rao, Pathak, and Chawla, 1999).
Marco and Starkey (1954) proposed that the damage for each level of reversed sinu- soidal stress amplitude is expressed by D (n/N )m, where the exponent m depends on the amplitude of the alternating stress.
where N1 is the number of cycles to failure at the highest stress amplitude S1, and ni are the number of cycles imposed at each stress Si.
The expression may be extended to a sequence of different alternating stress amplitudes in the order of application.
واژگان شبکه مترجمین ایران