材料力学考试典型题目

1、编辑课件1F1F2F3l1l2l3ABCD编辑课件2F1F2F3l1l2l3ABCDF1FN1)(kN2001N1N1 FFF编辑课件3F2F1FN2F1F2F3l1l2l3ABCD)(kN1502N2N21 FFFFFFN3)(kN5003NR3N FFFD编辑课件4FN2 =-15kN （-）FN1 =20kN （+）FN3 =- 50kN （-）15+-2050F1F2F3l1l2l3ABCD编辑课件5FN2 =-15kN ( - )FN1 =20kN （+）FN3 =- 50kN ( - )F1F2F3l1l2l3ABCD)(MPa.N 8 81761761 11 1AFAB )(MP

2、a.N 6 674742 22 2AFBC )(MPa.N 5 51101103 33 3AFDC 编辑课件6F1F2F3l1l2l3ABCDm102.534-N 1 11 11 1EAlFlABm101.424-N 2 22 22 2EAlFlBCm101.584-N 3 33 33 3EAlFlCD-0.3mm BCCDBllumm10-0.474- CDBCABADllll编辑课件7D+Me2Me3Me1180)2(pepe GIaMGIaM编辑课件8MPa7 .69tmaxmax WT mkN292e M33. 2180)23(pepe GIaMGIaMCBBACA D+Me2Me3M

3、e编辑课件9BAFlx)0()()0()(SlxFxxMlxFxF 0SFA左左FFA 右右SFSxFFlxM编辑课件102RRqlFFBA lqFFABx)0(222)()0(2)(2RRSlxqxqlxxqxxFxMlxqxqlqxFxFAA 编辑课件11)0(2)(SlxqxqlxF2SqlF 2SqlF +ql/2ql/2BlqFAxF编辑课件12)0(222)(2RlxqxqlxxqxxFxMA lqFABxF00 Mx，0, Mlx( )d0d2M xqlqxx2lx 822maxqlMMlx+82qll/2编辑课件13 lqFABxF+ql/2ql/2+82qll/282maxq

4、lM2maxSqlF编辑课件14lFABCabFFlFbFA RlFaFB R编辑课件15 xxlFABCabFRAFRB)2()0()()1()0()(SaxxlFbxMaxlFbxF )4()()()()()3()()()(SlxaxllFaaxFxlFbxMlxalFalblFFlFbxF 编辑课件16)1()0()(SaxlFbxF)3()()(SlxalFaxF xxlFABCabFRAFRB+lFblFa)4()()()(lxaxllFaxM )2()0()(axxlFbxM+lFba编辑课件17xxlFABCabFRAFRB+lFbalFblFa编辑课件18R AMFlR BMF

5、l( )() ( )S01MFxxlllABCabFRAFRBM+Ml编辑课件19xxlABCabFRAFRBM( ) MM xxl)0(ax ( )()MMM xx Mlxll)(lxa CMaMl左左 0M CMbMl右右+MalMbl编辑课件20lABCabFRAFRBM+/M l+MalMbl编辑课件21lABxFmaxwmax 编辑课件22xlwABxF( )() (1)M xF lx ( ) (2)EIwM xFlFx 21 (3)2FxEIwFlxC 2312(4)26FlxFxEIwxCC 编辑课件2321 (3)2FxEIwFlxC 2312(4)26FlxFxEIwxCC

6、0,0 0,0 xwxw120 0CC22FxEIwFlx 2326FlxFxEIw 编辑课件24BwmaxmaxxlyAF（ ）222max|22x lFlFlFlEIEIEI max maxw（ ）3max|3x lPlwwEI 编辑课件25max maxwABq编辑课件26RR2ABqlFFABqFRAFRBx2( )22qlqM xxx2346qlqEIwxxC 222qlqEIwxx 341224qlqEIwxxCxD编辑课件27233(64)24qlxxlEI 233(2)24qxwlxxlEI 0w xABqFRAFRB A B3max24ABqlEI wmax4max25384

7、lxqlwwEI 编辑课件28ABFDab编辑课件29RAbFFlRBaFFlFRAFRBABFDab12xx1R(0)AbMFxFxxal2() ()bMFxF xaaxll编辑课件3011bFxEIwMl2112bxEIwFCl 31116b xEIwFC xDl编辑课件3122()bFxF xaEIwMl 2222()22bF xaxFEIwCl33222()66bF xaxFxEIwCDl编辑课件3212ww12ww10w 20w 120DD2212()6FbCClbl ABFDabl12FRAFRB编辑课件3322211()36FbwlbxlEI 22216FbxlwbxlEI222

8、2221()()23FblxawxlblEI b 33222() ()6FblxxawxlblEI b 编辑课件3410()|6AxFab lblEI 2()|6Bx lFab lalEImax()6BFab lalEI 编辑课件350w 10w22211()036FbwlbxlEI 221(2 )33lba abx1222 3max()0 06429 3x xFbPblw |lb.wEIlEI 编辑课件36222(34)0.062548CFbFblwlbEIEI1222 3max()0 06429 3x xFbFbly|lb.wEIlEI编辑课件37ABCD1.4m0.6m15kN10kN0

9、.8mABFemkN15 6 . 0104 . 115e MkN25 F编辑课件38ABFMe+15kNm-20kNmmkN20max MmkN15 T)1(3243 DWMPa26.157223r WTM编辑课件39lFcr2l()2cr22EIFl Fcrl0.3l0.7l( . )2cr207EIFl Fcrl2cr2EIFl l 22cr)(lEIF lFcrl/4l/4l/2( / )2cr22EIFl l编辑课件40 22crlEIF 22cr)7 . 0(lEIF 22cr)5 . 0(lEIF 22cr)2(lEIF 22cr)(lEIF 编辑课件41scr ba cr22cr E cr Ps编辑课件42dF1.3 a BF1.6 aCaFA编辑课件43al22 al3 . 11 aal12. 16 . 17 . 07 . 0 dF1.3 a BF1.6 aCaFA编辑课件4430mm20mmyz1p99E m0058. 002. 003. 0)02. 003. 0(1213 AIiyy编辑课件45m0087. 0 AIizz15 . 0 zy 30mm20mmyz11586 zzzyyyilil kN5 .8922crcr zEAAF 编辑课件46FACD1.2m1.2mB30FFRAyFRAxFyxFNAB3002 . 14 .