材料力學(xué)第二章拉伸壓縮、剪切少學(xué)時(shí)

1、2Chapter23 456 FFFF7mmFF8mmFFNmmFF .9mmFFmmFFN10FNmmFFmmFFNmFm11FNmFFmmFFNmFm12xFNO13CABD600300500400E40kN55kN 25kN20kN14CABD600300500400E40kN55kN 25kN20kNCABDE40kN55kN 25kN20kNFRAkN100202555400RR AAxFFF15CABDE40kN55kN 25kN20kN10R1N AFF)()kN(10R1N AFF16 F40kNFN220kNCABDE40kN55kN 25kNF2040R2N AFF)()k

2、N(5040R2N AFF17FN320kN25kNCABDE40kN55kN 25kN20kNF30 0202025253 3 NF)()kN(53N F1820kNFN440kN55kN 25kN20kNF4)(kN)204N F195010520+CABD600300500400E40kN55kN 25kN20kN(kN)50Nmax F20FFabcd21FFabcda b c d 22 F FN23AFN 24Nmaxmax AFNmax FA NmaxAF AFmaxN 25FABCFF3000400037024021kNN50501 1 FFkNN1501503 32 2 FF2

3、6FABCFF300040003702402150kN150kNMPa.N/m.2N87870 0101087870 024240 024240 050000500006 61 11 11 1 AF MPa.N/m.2N1 11 110101 11 137370 037370 01500001500006 62 22 22 2 AF max 27ABCF1m28ABCF1mFAxy29FAxy0 030300 01 1 FFFysinN0 00 01 12 2 cos30NNFFFxFFFF7327321 12 22 21 1.NN 22mm6 62 26 61 11010286028602

4、2143014301010217221722 210861086 AA30AFmaxN FFFF732. 122N1N kN.N24243693691 11 1 AF kN.N20204864862 22 2 AF kN.N6 61841842 21 11 1 FFkN.N7 72802807327321 12 22 2 FF312aaFABDC322aaFABDCCDFACBFFMCDA230N /N232119MPa4CDFFAd N AFCDCD33F=33.5kN2aaFABDCCDFACB2 23 3FAFCD N N AFCDCD/N 2 23 3FFACD / 2324dF 34

5、 3536 dl標(biāo)距標(biāo)距37FOl38 p E p Oa39e p fOfhab es sc40滑移線滑移線41 s b b e p fOfhabce42 s b e p fOfhabce43 %1001001 1 lll %1001001 1 AAA 44 abcefOgfhdd45pe abcdefOdgfh46 0.2 0.20.2%2 20 0. o47 tan EO /MPa/% 48dh0 03 35 51 1. dh49 sO 50O /% 51nu ssn bbn 52max max 53max max Kmax 54 FFbh h1 lllll 1 155bbbbb 1 1

6、FFbhh1 bbb 156 AFN ll E EAlFlN 57軸向變形的一般公式軸向變形的一般公式)(d)()d(NxEAxxFl lxxEAxFld)()(N58F1F2F3l1l2l3ABCD59F1F2F3l1l2l3ABCD15+-205060FCB =-15kN ( - )FAB =20kN （+）FDC =- 50kN ( - )F1F2F3l1l2l3ABCD)(MPa8 .1761 AFABAB )(MPa5 .1103 AFDCDC 61F1F2F3l1l2l3ABCDm102.534-N 1 11 11 1EAlFlABm101.424-N 2 22 22 2EAlFl

7、BCm101.584-N 3 33 33 3EAlFlCD-0.3mm BCCDBllumm10-0.474- CDBCABADllll62F FA12x30yA1 1l 12mABCF301 12 2FFFF732. 122N1N A2 2l 2mm.mm.NN7657650 01981981 12 22 22 22 22 21 11 11 11 11 1 EAlFlAAEAlFlAA633030AA1A2l 1l 2A30A1 1l 12mABCF301 12 2A2 2l 2A330cos1222llAAAAAA 30sin30tantan3012232llAAAA mm.)()(787

8、83 32 23 32 22 22 23 3 AAAAAA64 （FFFFFF鉚釘鉚釘(rivet)65mFFAB d 1 1 166nnFF 67mmF剪切面剪切面FS FFmm00S FFFxFF SAFS 68mmF剪切面剪切面FFmm AFSnu u 69FFFF70FF bsbsbs AFAFbsbs 71hbsAdh72 bsbs FA bsbs SFA AFbsbs SFA u 73bhlMeFMee2MdF kNe57571010707010102 22 22 23 33 3 dMF74MeF MPa6 .281010020105763SblFAFFF S bsbsbsMPa. 3 3959510106 6100100101057572 26 63 3hlFAFbhl75 1FFA 1Bd76 1FFA 1Bdd2F2FF剪切面剪切面77d2F2FFF2SFF 24dA MPa51SAF1 2 bsbsbsMPa 150150tdFAF剪切面剪切面78DdhF7980DdhF22bs()4DdA dAdh81 d82F dF 24FFdA 83F dF dFAFS84FF 85FFbF