%0 Journal Article
%T Fatigue Performance of 2017-T4 AL. alloy Under sub-zero Temperature by Using Electromechanical Freezing System
%J Engineering and Technology Journal
%I University of Technology-Iraq
%Z 1681-6900
%A J.M. Alalkawi, Hussain
%A Abdulkareem Fattah, Fikrat
%A Amer Kadhim, Duaa
%D 2016
%\ 12/01/2016
%V 34
%N 14A
%P 2631-2641
%! Fatigue Performance of 2017-T4 AL. alloy Under sub-zero Temperature by Using Electromechanical Freezing System
%K Fatigue behavior at sub
%K zero temperature
%K cumulative fatigue damage
%K Al alloy
%R 10.30684/etj.34.14A.8
%X The effects of sub-zero(-22Co) cyclic rotating bending on the S-N behavior and cumulative damage are reported for 207-T4 aluminum alloy .Experimental characterization of fatigue behavior showed that the S-N curves behavior may described by the following Basquin's formulas: σ_f=1230〖(N_f)〗^(-0.15) At room temperature (RT) And σ_f=1563〖(N_f)〗^(-0.17) At sub-zero temperature (-22Co) From the above equation, the fatigue behavior can be change at σ_f=204 MPa and N_f=159475 cycles . Slightly increase in fatigue life results above 204 MPa and slightly decrease in fatigue below the 204 MPa stress level. A non-linear experimental law is introduced for the accumulation of damage at sub-zero temperature variable fatigue. This law gave conservative and safe fatigue life time prediction when applying to the data of variable fatigue at low temperature (-22 Co).
%U https://etj.uotechnology.edu.iq/article_123693_26959284ceb7aa5b9eb73958ca3e8290.pdf