第八章组合变形.ppt

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2、FFACD1.2m1.2m30BFFRAyFRAxFyxFNAB30yzz0z15050150150350FFyzz0z15050150150350FFnnFNMyyFFMFFy22N105 .4210)5 . 735( yzz0z15050150150MPa15NFAF nnFNMyyzz0z15050150)(MPa53105 . 74250maxt FIzMyy )(MPa53105 .124251maxc FIzMyy 5050150150yzz0z1拉拉nnFNMy53105 . 742515tmaxtmaxt FF5050150150yzz0z1拉拉压压nnFNMy53105 .1

3、2425cmaxcmaxc FAF5050150150yzz0z1拉拉压压nnFNMyaaaa1122N14)2(aFaFAFAF aa22N222612/2aFaaFaaaFWMAF 8 84 42 22 22 2 aFaF/yzebhmmyze2 21 1FFF eFMz 221FFF eFMz 2AFFAF21N 6/22bheFWMzz 06/2221 bheFAFF 6/ )(2212bhFAFFe yzeO1yzFA(yF,zF)eO1yzA(yF,zF)F FzFyFyFeMFzFeM cossinyzO1Fx yO1nnyzMyMz FzFyFyMFzMFyzMyMzAFAF

4、N yFyyIzzFIzM zFzzIyyFIyM (y,z)C ,zFyFIyyFIzzFAF N yzMyMz(y,z)CzFyFIyyFIzzFAF N 22zzyyiAIiAI )1(22NzFyFiyyizzAF )1(22NzFyFiyyizzAF 012020 zFyFiyyizzOz中性轴中性轴中性轴中性轴(yF , zF )012020 zFyFiyyizzFyzFzyziayia22 yzO中性轴中性轴外力作用点外力作用点中性轴中性轴1(1,1)2(2,2)(abcyyzzyzFyF/WzNF yM zM FzF/Wyyz1D2中性轴中性轴zFyFWyFWzFAF minm

5、ax max 中性轴中性轴ayazFFziayiayzzy2 22 2 (yF,zF)中性轴中性轴ayazyz中性轴中性轴中性轴中性轴(yF,zF)(yF,zF)(yF,zF)截面核心截面核心y中性轴中性轴ayaz(yF,zF)zyFyzFaizaiy2 22 2 截面核心截面核心OdA 11,2zyada422diizy ,82162121dddaiyyzF 0121 zyFaiz1d/8bBCDyzO12121222232hibhbhbAIizyy 112zyaha62122211hhhaiyyzF 0121 zyFaiz 1BO12346 60 02 22 2bzyFF ,)0,6(h)

6、,(6 60 0b hbABCDyzO2341 0 10202 yiyzizzFyF0122 FzBFyByiyziz313 324hb laABCFBFMxlaABCAAFMMFlA截面截面 C3C4TC3C4C2C1 C2C11C1 2222314212)2(2 02 22313r4 224r3 r 22313r4 224r3 1WTMWTWM222t2223r)(4)(4 WTMWTWM222t2224r75. 0)(3)(3 3t216dWW 1ABCD1.4m0.6m15kN10kN0.8mABFemkN15 6 . 0104 . 115e MkN25 FABFMe+15kNm-20

7、kNmmkN20max MmkN15 T)1(3243 DWMPa26.157223r WTMzxyABl/2l/2MeMeMeCF=3F222)(221eDFDFFMC kN3202 FkN20 F+T=1kNm+1kNm1223r TMW323dW mm83.44 dmkN1 TmkN1max MMeMeCF=3F2BACDyz5kN10kN300mm300mm100mmx1.82kN3.64kNBACDyz5kN10kN300mm300mm100mmx1.82kN3.64kNxyzACBD5kN1kNm1.82kN3.64kN10kN1kNm1CT 图图-My图图0.57CB0.36Mz

8、图图0.2271CBxyzACBD5kN1kNm1.82kN3.64kN10kN1kNmmkN36. 0mkN57. 0 yByCMMmkN1mkN227. 0 zBzCMMmkN227. 0mkN57. 0 zCyCMMCT图图-My图图0.57kNmCB0.36kNmMz图图0.2271CBmkN1mkN36. 0 zByBMMmkN1 CBTTmkN063. 122 zByBBMMMmkN36. 022 zCyCCMMM WWTMBB137275. 0224r323dW .3632137251 9mm10010d 400400400400mkN4 . 0kN1e2 MFmkN4 . 0mkN8 . 04 . 08 . 0max21max TFFM WTM2max2max3rmm5 .38 d400400400mkN4 . 0mkN8 . 04 . 08 . 0max21max TFFMkN203N FF400400400MPa143Nmaxmax AFWMz MPa8 .31tmaxmax WT MPa1574223r