Question

Question 4 It is estimated that a particular aluminium component has been exposed to the following levels of service each year for 5 years An alternating stress range of 150 MPa about a mean stress of 50 MPa for 500,000 cycles and an alternating stress range of 180 MPa about a mean stress of 60 MPa for 200,000 cycles. The aluminium has an ultimate tensile strength Crs = 240MP2. The material follows Basquin's Law for high-cycle fatigue, i.e Δσν,-C where a 0.125, C\ = 1600MP2 and Aois the cyclic stress range. Using this information and assuming that future loading will be the same as in the past, predict the remaining life (in years) of this component

Answer 1

Railurre (rutericm EEAARoodman's Accaeding to StAress equivaluct Completely reversed C: Camsidering 6rev 2 1-6m Sut Hetre, dut 2 40 mpa (50 mPa 50 MPa A+ & mI2 50000 ycdyyear (40 6pars 2 2 ( - 50 Q40 mg- 4ut 2199.43t mPa Maas Carhetre A62 6s 2 C a-125 X Me 6rers (600 Macu' at Cztrt 193.41 3 mey 2 2. (89.4437 MO-o4 (ydes at 5tress (ewel 6ro to fatigul feulur 5twilarlyt M2 2.56643 6 x 10 (C0mPr 2 brwy &180 2 Sut

Nows 2 P2 39013 44.23106 Cycles Mow during Tatal mo. ot Cyclas Componaut is Subs'eeted years tSttss (eel 6reu, 2 mx ydy 2 X 0 Cycles mx&xi てでい Acc. to Miner's e 2 X Xん 2 | 3901844.2310 2-5356436x10 14.165 years 5-years hus passed Buts Jesmaiuing yars t Companenct Aemaining Reilure 14-1652-5 2 -9-1653 yews to Completer yearrs Answer