材料力学第五版刘鸿文第四章-弯曲内力PPT优秀课件

《材料力学第五版刘鸿文第四章-弯曲内力PPT优秀课件》由会员分享，可在线阅读，更多相关《材料力学第五版刘鸿文第四章-弯曲内力PPT优秀课件（95页珍藏版）》请在装配图网上搜索。

1、Mechanics of Materials Mechanics of Materials 韩光平韩光平Mechanics of Materials 韩光平韩光平Mechanics of Materials 韩光平韩光平Mechanics of Materials 韩光平韩光平Mechanics of Materials 韩光平韩光平 Mechanics of Materials 韩光平韩光平AB对称轴对称轴纵向对称面纵向对称面梁变形后的轴线与外梁变形后的轴线与外力在同一平面内力在同一平面内梁的轴线梁的轴线RAF1F2RBMechanics of Materials 韩光平韩光平。RAAAAA

2、Mechanics of Materials 韩光平韩光平AAAYAAXAVHMMechanics of Materials 韩光平韩光平 Mechanics of Materials 韩光平韩光平Mechanics of Materials 韩光平韩光平 BAalFRAXARBABFlalFRFlFaRmXFAyBAAx)(,0 ,00 ,0 Mechanics of Materials 韩光平韩光平MYAXARBABFmmxYAFSCFRBFSCMxRMmlalFRFFACAy ,0)(s ,0Mechanics of Materials 韩光平韩光平FSdxF+mmdxFSFmmMech

3、anics of Materials 韩光平韩光平；mm（受压）（受压）MeM+（受拉）（受拉）MeMmmMechanics of Materials 韩光平韩光平0mARBBdEDAabclCFF1F2RA021bFaFlRB0mB0)()(21blFalFlRAlblFalFRA)()(21lbFaFRB21Mechanics of Materials 韩光平韩光平 BdEDAabclCFF1F2RAAEcFSERA00S EAyFR,F0,0cRMmAEEAERFScRMAEMechanics of Materials 韩光平韩光平AEcFSERAa-cb-cCDl-cBEFSEF1F2

4、 0yF021S FFRFBE0ME0)()()(21McbFcaFclREB+cRMAEAERFSMechanics of Materials 韩光平韩光平 BdEDAabclCFF1F2RAFdBFSFMFRB0,00,0S dRMmRFFBFFBFy-+RFBF SdRMBF Mechanics of Materials 韩光平韩光平niiSFF左（右）左（右）1 Mechanics of Materials 韩光平韩光平mkkiniiMaFM左（右）左（右）左（右）左（右）11Mechanics of Materials 韩光平韩光平F2=FACDBbacF1=FRARB kN60FR

5、RBAMechanics of Materials 韩光平韩光平F2=FACDBbacF1=FRARBkN601SFFCkN.m061.bFMC060601SFRFADkN.m8.13)(1FacFacRMADMechanics of Materials 韩光平韩光平C12mkN4SS1RFFAC左左kN.m411RMMAC左左kN4)4(S2SRFFBC右右kN.m651)4()152(2.RMMBC右右B1m2.5m10kN.mAC12RARBMechanics of Materials 韩光平韩光平 Mechanics of Materials 韩光平韩光平 M(x)/(N.m)Fs 图

6、的坐标系图的坐标系O M 图的坐标系图的坐标系OFs(x)/Nx/mx/mMechanics of Materials 韩光平韩光平BAFlx)0()()0()(SlxFxxMlxFxF0SFA左左0SFA右右Mechanics of Materials 韩光平韩光平FSxFFlxMAFBlx)0()()0()(SlxFxxMlxFxFMechanics of Materials 韩光平韩光平2qlRRBAlqRARBABx)0(222)()0(2)(2SlxqxqlxxqxxRxMlxqxqlqxRxFAAMechanics of Materials 韩光平韩光平 )0(2)(Slxqxql

7、xF2SqlF 2SqlF +ql/2ql/2BlqRAAxRBMechanics of Materials 韩光平韩光平)0(222)(2lxqxqlxxqxxRxMAlqRAABxRB00,Mx0,Mlx02)(dqxqldxxM2lx 822maxqlMMlx+82qll/2Mechanics of Materials 韩光平韩光平 lqRAABxRB+ql/2ql/2+82qll/282maxqlM2maxSqlFMechanics of Materials 韩光平韩光平lFABCabRARBlFbRAlFaRBMechanics of Materials 韩光平韩光平 xxlFABC

8、abRARB)2()0()()1()0()(SaxxlFbxMaxlFbxF)4()()()()()3()()()(SlxaxllFaaxFxlFbxMlxalFalblFFlFbxFMechanics of Materials 韩光平韩光平)1()0()(SaxlFbxF)3()()(SlxalFaxFxxlFABCabRARB+lFblFaMechanics of Materials 韩光平韩光平)4()()()(lxaxllFaxM)2()0()(axxlFbxMxxlFABCabRARB+lFbaMechanics of Materials 韩光平韩光平xxlFABCabRARB+lF

9、balFblFaMechanics of Materials 韩光平韩光平lmRAlmRB)1()0()(SlxlmxFlABCabRARBmMechanics of Materials 韩光平韩光平xxlABCabRARBm(2)xlmxM)()0(ax(3)()(xllmmxlmxM)(lxaMechanics of Materials 韩光平韩光平lABCabRARBm)1()0()(SlxlmxFlmF S+lmMechanics of Materials 韩光平韩光平xlABCabRARBm(2)xlmxM)()0(ax(3)()(xllmmxlmxM)(lxa lmaMC左左 0M

10、 lmbMC右右+lmalmbMechanics of Materials 韩光平韩光平lABCabRARBm+lm+lmalmbMechanics of Materials 韩光平韩光平Mechanics of Materials 韩光平韩光平ABFlxlxlFRA)(lFxRBxlxlFxRMAC)(0ddxMC0)2(xllF2lx Mechanics of Materials 韩光平韩光平2lx xlxlFxRMAC)(FlM41maxMechanics of Materials 韩光平韩光平xyq(x)FmMechanics of Materials 韩光平韩光平Fs(x)M(x)F

11、s(x)+dFs(x)M(x)+dM(x).Fxyq(x)mnn dxmmxmnq(x)mnCMechanics of Materials 韩光平韩光平Fs(x)M(x)Fs(x)+dFs(x)M(x)+dM(x)mmnnq(x)C0d)()(d)()(0SSSxxqxFxFxFFy )(d)(dSxqxxF02d)d(d )s()()(d)(0 xxxqxxFxMxMxMMC)(d)(dSxFxxMMechanics of Materials 韩光平韩光平)(d)(dSxqxxF)(d)(dSxFxxM)(d)(d22xqxxMMechanics of Materials 韩光平韩光平Fs(

12、x)xOxOM(x)(d)(dSxqxxF)(d)(dSxFxxM)(d)(d22xqxxMMechanics of Materials 韩光平韩光平 xFs(x)OxOM(x)(d)(dSxqxxF)(d)(dSxFxxM)(d)(d22xqxxMOM(x)xMechanics of Materials 韩光平韩光平)(d)(dSxqxxF)(d)(dSxFxxM)(d)(d22xqxxMMechanics of Materials 韩光平韩光平FCmC或或q 0FmCMechanics of Materials 韩光平韩光平)(d)(dSxqxxF2121)()(dSxxxxdxxqxF2

13、1)()()(1S2SxxdxxqxFxF2112)(SSxxxxdxxqFFMechanics of Materials 韩光平韩光平2112)(SSxxxxdxxqFF)(d)(dSxFxxMbaABdxxFMM)(SMechanics of Materials 韩光平韩光平k623.RA kN27 RBBACD2001151265FFRARB231kN6.23SAARF右右Mechanics of Materials 韩光平韩光平23.6KN1.7KN27KNBRBACD2001151265FFRA231kN27SBDRF右右kN0S右右BFkN27SmaxFkN7.1SFRFAC右右M

14、echanics of Materials 韩光平韩光平4.72kN.m3.11kN.m+BACD2001151265FFRARB231mkN11.3115.0RMBD0MBmkN72.4max MmkN72.42.0 RMAC0MAMechanics of Materials 韩光平韩光平BACD2001151265FFRARB2314.723.11+23.61.727+Mechanics of Materials 韩光平韩光平 RARBEqABCD0.21.612kN806110050RRBAMechanics of Materials 韩光平韩光平+80kN80kNkN80SAARF右右

15、 kN80SACRFkN80SBDRFkN80S左左BBRFkN0S右右BF),(kN80maxSFRARBEqABCD0.21.612Mechanics of Materials 韩光平韩光平0MAkN.m1620.RMACmkN1620RMBDmkN48)201(212qRMAE mkN48maxM+161648单位：单位：kN.mRARBEqABCD0.21.612Mechanics of Materials 韩光平韩光平3m4mABCDE4m4mRARBF1=2kNq=1kN/mm=10kN.mF2=2kNkN7RAkN5RBkN7S RFAA右右kN34S qRFAC左左kN141S

16、 PqRFAC右右kN32S BDRPFMechanics of Materials 韩光平韩光平3m4mABCDE4m4mRARBF1=2kNq=1kN/mm=10kN.mF2=2kNkN32SBRFFkN22S PFB右右kN7S 右右AFkN3S 左左CFkN1S 右右CFkN3S DF01SFqxRFAx7kN1kN+3kN3kN2kNx=5mMechanics of Materials 韩光平韩光平0MAmkN204242qRMACmkN16472mRFMBD左mkN5.20maxMMFmkN6472RFMBD右m6kN32FMB0 ME3m4mABCDE4m4mRARBF1=2kN

17、q=1kN/mm=10kN.mF2=2kN201666+20.5Mechanics of Materials 韩光平韩光平10.5113F=50kNM=5kN.mAECDKBRARBmAq=20kN/mMechanics of Materials 韩光平韩光平 10.5113F=50kNM=5kN.mAECDKBRARBmAq=20kN/m81kN31kN29kN+Mechanics of Materials 韩光平韩光平10.5113F=50kNM=5kN.mAECDKBRARBmAq=20kN/m0qxRFBSxm45.1qRxBx=1.4581kN31kN29kN+Mechanics o

18、f Materials 韩光平韩光平B10.5113F=50kNM=5kN.mAECDKRARBmAq=20kN/mmkN5.96mMAA右右mkN5.15181MMAE05.031MMECmkN31131MMCD96.515.531Mechanics of Materials 韩光平韩光平 B10.5113F=50kNM=5kN.mAECDKRARBmAq=20kN/mmRMBK1mkN345129mRMB45.2maxmkN5545.122qmkN5mMB左左0MB右右96.53115.5x+55345Mechanics of Materials 韩光平韩光平F=50kNM=5kN.mAE

19、CDKRARBmAq=20kN/m+Mechanics of Materials 韩光平韩光平abcd18kN2kN14kN3m3m6m+)(dsdxqxFkN18SFB左左kN2S FB右右CABDF=20kNMechanics of Materials 韩光平韩光平)(ddxqxFSqdxxqFFdcCD6)(SSkN26)2()14(qabcd18kN2kN14kN3m3m6m+q=2kNCABDF=20kNMechanics of Materials 韩光平韩光平)(d)(dSxFxxMbaABdxxFMM)(SmkN543180abcd18kN2kN14kN3m3m6m+cbSBCx

20、xFMMd)(kN.m 483)2(540Md48dab54c+Mechanics of Materials 韩光平韩光平40kN.mabcd2m2m2m+)(d)(dSxFxxMSS2)(FdxxFMMcbBCkN2024002MSMFBCabcd20kNMechanics of Materials 韩光平韩光平m)(ddxqxFS0MA左左mkN40右右AM40KN.mabcd2m2m2m+abcd20kNBCAD0SFB左左kN20SFB右右kN20SFB左左0SFB右右FFMechanics of Materials 韩光平韩光平)()()(),(Sn21S11S21SnnFFFFFF

21、FFFF )()()(),(nn221121FMPMPMFFFMn Mechanics of Materials 韩光平韩光平xF=ql/3qlMechanics of Materials 韩光平韩光平xF=ql/3ql2)(2qxFxxMFxqxFxxMF)(2)(2qxxMq2)(2qxFxxMMechanics of Materials 韩光平韩光平FxFqxlqx+FxxMF)(Fl2)(2qxxMq22ql+-62ql62ql8 81 1q ql l2 2Mechanics of Materials 韩光平韩光平BCF2F3aDEF1AaaaF1291acebdF2e122+acbd

22、215acebdF3aaaaMechanics of Materials 韩光平韩光平291acebdmkN1312152112229121)()(MCBCF2F3aDEF1Aaaa122+acebd215acebd291215131acebdMechanics of Materials 韩光平韩光平ABCMechanics of Materials 韩光平韩光平Mechanics of Materials 韩光平韩光平alF1F2ABCM(x)FN(x)FS(x)CxF1xMechanics of Materials 韩光平韩光平alF1F2ABCFS(x)CBaF1F2FN(x)M(x)x

23、Mechanics of Materials 韩光平韩光平0 FN图图F1|CalF1F2ABFs图图F1+F2+Mechanics of Materials 韩光平韩光平CalF1F2ABF1aF1aF1a+F2l Mechanics of Materials 韩光平韩光平Mechanics of Materials 韩光平韩光平FOR cosFFS sinNFF sinFRM 0sin0N FFFn0cos0S FFFt0sin0 FRMmCFtnC FNFS O+MFRMechanics of Materials 韩光平韩光平)(0 )cos1()cos()(FRRRFFxM)(0 sin)(1S FFF)(0 cos)(2N FFFxOFR mmABMechanics of Materials 韩光平韩光平xOFR mmAB)(0 )cos1()cos()(FRRRFFxM)(0 sin)s(1 FFF)(0 cos)(2N FFFMechanics of Materials 韩光平韩光平O+FS图图ABOM图图2PROFN图图PP+xOFR mmAB个人观点供参考，欢迎讨论