Does the ANSYS fatigue module use the full or the alternating stress difference range?
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In Release 10.0, the ANSYS fatigue module uses alternating stress difference range. ! AXISYMMETRIC MODEL WITH INTERNAL PRESSURE ! EXPECTED RESULTS ! ******************************* ***************** ! Stress Intensity Event 1 = 10000 (approx) ! Stress Intensity Event 2 = 20000 (approx) ! Alternating Stress Intensity = 5000 (approx) ! Required Cycles = 1000 ! Allowable Cycles = 10000 (approx) ! Fatigue Usage = 0.1 (approx) ri = 10 ! inside radius ro = 11 ! outside radius thick = ro-ri ! thickness len = 50 ! length md = 3 ! mesh density - higher number = more refined p_int = 1000 ! internal pressure del = 1e-6 ! selection factor /prep7 et,1,182,1,,1 mp,ex,1,10e6 mp,prxy,1,.3 rect,ri,ro,0,len/2 rect,ri,ro,len/2,len wpoff,0,len cyl4,0,0,ri,0,ro,90 cswpla,11,1 csys,0 wpcsys aglue,all numcmp,all lsel,s,length,,thick-del,thick+del lesize,all,thick/(2*md) alls esize,thick/md mshape,0,2d mshkey,1 amesh,all lsel,s,loc,x,ri-del,ri+del cm,temp_l,line csys,11 lsel,s,loc,x,ri-del,ri+del csys,0 cmsel,a,temp_l nsll,,1 cm,press_n,node nsel,s,loc,y,-.01,.01 d,all,uy,0 nsel,s,loc,x,-.01,.01 d,all,ux,0 alls n1 = node(ro,len/2,0) /solu time,1 cmsel,s,press_n sf,all,press,p_int alls solve time,2 cmsel,s,press_n sf,all,press,2*p_int alls solve /post1 set,1 nsel,s,node,,n1 prnsol,s,comp prnsol,s,prin set,2 prnsol,s,comp prnsol,s,prin alls fp,1,5000,10000 fp,21,10000,100 set,1 fsnode,n1,1,1 set,2 fsnode,n1,1,2 fe,1,1000 ftcalc,1,n1 ! ANSYS RESULTS ! EVENT/LOADS 1 1 AND 1 2 ! PRODUCE ALTERNATING SI (SALT) = 4835.2 WITH TEMP = 0.0000 ! CYCLES USED/ALLOWED = 1000. / 5578. = PARTIAL USAGE = 0.17928 ! CUMULATIVE FATIGUE USAGE = 0.17928 |
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