材料力学第11章交变应力部分课件

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1、 （）（ ) AFts stts ss s sts s maxs s min静平衡位置FF tzAtry sintIrMIyM s ssints ss s1s s2s s3s s4s s1O 裂纹源裂纹源光滑区光滑区粗糙区粗糙区 . .一个应力循环一个应力循环Os sts ss smaxminr maxminrs s maxs s minO一个应力循环一个应力循环s sts s maxs s mins s as sa2minmaxas ss ss s 2minmaxms ss ss saOs smaxs smins st1maxmins ss srmaxas ss s 0m s s1r0max

2、mins ss sr2maxmas ss ss s Os smaxs smin=0s st1r0a s smaxms ss stOs smaxs smin=0s s.maxmax24 58300561MPa0 0115FAs s .minmin24 55800537 2MPa0 0115FAs s MPa1225375612minmaxa s ss ss sMPa54925375612minmaxm s ss ss s957. 0561537maxmins ss sr()s s-1s smax，1N11s smax，2N22Ns smaxFFFFaabs ss s 1max,2max,s s1

3、max,s ss s-1s smax，1s smax，2N1N212Ns smaxFa 1()()dkK-1-1s ss ss s()()1 d1 kK s sK K1.001.201.401.601.802.002.202.402.600.020.040.060.080.100.120.140.16 0.180MM1 . 1dDRdDs sKb500MPas s600700800900b1000MPas sdR1.201.401.601.802.002.202.402.602.803.003.200.020.040.060.080.100.120.140.16 0.180MM2 . 11 .

4、 1dDRdDs sKb500MPas s600700900b1000MPas sdR800s sKMM22 . 1dDRdD0.020.04 0.06 0.080.10 0.12 0.14 0.160.180dRb1000MPas s800900700600b500MPas s1.201.401.601.802.002.202.402.602.803.003.203.40TTRdD2 . 11 . 1dDb1000MPas s800b700MPas s0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.180dR1.201.401.601.802.002.20

5、2.401.00 K9000.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.180dRTTRdD22 . 1dD1.201.401.601.802.002.202.401.00 K2.602.80b700MPas s800b1000MPas s900(The effect of member sides)()ds ss s s s-1-1-1-1 s s （）()()-1 d s s s s- -1 1101 s s s ss ss sKs sKs s 1s s rK 01 1011 1s s s ss ss ss sKnn1011 1 Knn1maxs ss