N=(1 cycle/min)×60x24x365=5.256x10的 cycles/year According to o-N diagram,the load on the rod must be less than 500MPa 800 600 Fatigue limit =410MPa 400 200 Tools steel 0 104 10时 106 107 108 Cycles PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint..com,cn
According to s-N diagram，the load on the rod must be less than 500MPa 104 105 106 107 108 Fatigue limit ＝410MPa Tools steel S t r e s s M P a Cycles 800 600 400 200 0 N＝（1 cycle/min）´60´24´365 ＝ 5.256´105 cycles/year PDF 文件使用 "pdfFactory Pro" 试用版本创建 êwww.fineprint.com.cn
Using formula 10.181F d 10.18×2.44m×0.05MN 500MPa= d d=0.135m=136mm PDF文件使用"pdfFactory Pro”试用版本创建wm,fineprint.com,cn
3 10.18 d lF s = d m mm d m MN MPa 0.135 136 10.18 2.44 0.05 500 3 = = ´ ´ = Using formula ： PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn
A shaft with a diameter of 136mm should operate for one year under these condition.In addition,we might consider producing a shaft that would never fail. According to o-N diagram,fatigue limit is 410MPa, the minimum diameter: 10.18×2.44m×0.05NW 410MPa d d=0.145m=145mm PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint..com,cn
A shaft with a diameter of 136mm should operate for one year under these condition. In addition, we might consider producing a shaft that would never fail. According to s-N diagram，fatigue limit is 410MPa， the minimum diameter： d m mm d m MN MPa 0.145 145 10.18 2.44 0.05 410 3 = = ´ ´ = PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.cn
3.2.6 Creep X Rupture △ Creep △t curve Initial stage Middle stage Final stage Time (t) PDF文件使用"pdfFactory Pro”试用版本创建ww,fineprint.com.cn
3.2.6 Creep De Dt C r e e p s t r a i n ( C r e e p s t r a i n ( e ) Time (t) Initial stage Middle stage Final stage Rupture Creep curve PDF 文件使用 "pdfFactory Pro" 试用版本创建 êwww.fineprint.com.cn
100 760°C (edW) 0特0200 870°C 980°C 1040℃ stress rupture curve ferrous alloy Nickel-chromium 6 1090°C 432 Factors: 102 103 104 10时 temperature, time,stress Rupture time (h) PDF文件使用"pdfFactory Pro" 试用版本创建ww.fineprint.con.cn
N i c k e l N i c k e l - c h r o m i u m c h r o m i u m - fe r r o u s a l l o y fe r r o u s a l l o y s t r e s s s t r e s s － r u p t u r e c u r v e r u p t u r e c u r v e 102 103 104 105 S t r e s s ( M P a ) Rupture time (h) 760°C 870°C 980°C 1040°C 1090°C 100 60 40 30 20 10 6 4 3 2 Factors： temperature, time, stress PDF 文件使用 "pdfFactory Pro" 试用版本创建 êwww.fineprint.com.cn