第二章拉伸壓縮、剪切少學(xué)時工程力學(xué)

1、2022-3-32Chapter22022-3-33 2022-3-342022-3-352022-3-36 FFFF2022-3-37mmFF2022-3-38mmFFNmmFF .2022-3-39mmFFmmFFN2022-3-310FNmmFFmmFFNmFm2022-3-311FNmFFmmFFNmFm2022-3-312xFNO2022-3-313CABD600300500400E40kN55kN 25kN20kN2022-3-314CABD600300500400E40kN55kN 25kN20kNCABDE40kN55kN 25kN20kNFRAkN100202555400RR

2、 AAxFFF2022-3-315CABDE40kN55kN 25kN20kN10R1N AFF)()kN(10R1N AFF2022-3-316 F40kNFN220kNCABDE40kN55kN 25kNF2040R2N AFF)()kN(5040R2N AFF2022-3-317FN320kN25kNCABDE40kN55kN 25kN20kNF30 02 20 02 25 53 3 NF)()kN(53N F2022-3-31820kNFN440kN55kN 25kN20kNF4)(kN)204N F2022-3-3195010520+CABD600300500400E40kN55kN

3、 25kN20kN(kN)50Nmax F2022-3-320FFabcd2022-3-321FFabcda b c d 2022-3-322 F FN2022-3-323AFN 2022-3-324Nmaxmax AFNmax FA NmaxAF AFmaxN 2022-3-325FABCFF3000400037024021kNN50501 1 FFkNN1 15 50 03 32 2 FF2022-3-326FABCFF300040003702402150kN150kNMPa.N/m.2N8 87 70 01 10 08 87 70 02 24 40 02 24 40 05 50 00 0

4、0 00 06 61 11 11 1 AF MPa.N/m.2N1 11 110101 11 137370 037370 01500001500006 62 22 22 2 AF max 2022-3-327ABCF1m2022-3-328ABCF1mFAxy2022-3-329FAxy0 030300 01 1 FFFysinN0 00 01 12 2 cos30NNFFFxFFFF7327321 12 22 21 1.NN 22mm6 62 26 61 11 10 02 28 86 60 02 21 14 43 30 01 10 02 21 17 72 22 21 10 08 86 6 A

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6、FFACD / 2324dF 2022-3-334 2022-3-3352022-3-336 dl標(biāo)距標(biāo)距2022-3-337FOl2022-3-338 p E p Oa2022-3-339e p fOfhab es sc2022-3-340滑移線滑移線2022-3-341 s b b e p fOfhabce2022-3-342 s b e p fOfhabce2022-3-343 %1 10 00 01 1 lll %1001001 1 AAA 2022-3-344 abcefOgfhdd2022-3-345pe abcdefOdgfh2022-3-346 0.2 0.20.2%2 20

7、0. o2022-3-347 tan EO /MPa/% 2022-3-348dh0 03 35 51 1. dh2022-3-349 sO 2022-3-350O /% 2022-3-351nu ssn bbn 2022-3-352max max 2022-3-353max max Kmax 2022-3-354 FFbh h1 lllll 1 12022-3-355bbbbb 1 1 FFbhh1 bbb 12022-3-356 AFN ll E EAlFlN 2022-3-357軸向變形的一般公式軸向變形的一般公式)(d)()d(NxEAxxFl lxxEAxFld)()(N2022-3

8、-358F1F2F3l1l2l3ABCD2022-3-359F1F2F3l1l2l3ABCD15+-20502022-3-360FCB =-15kN ( - )FAB =20kN （+）FDC =- 50kN ( - )F1F2F3l1l2l3ABCD)(MPa8 .1761 AFABAB )(MPa5 .1103 AFDCDC 2022-3-361F1F2F3l1l2l3ABCDm102.534-N 1 11 11 1EAlFlABm101.424-N 2 22 22 2EAlFlBCm101.584-N 3 33 33 3EAlFlCD-0.3mm BCCDBllumm10-0.474-

9、CDBCABADllll2022-3-362F FA12x30yA1 1l 12mABCF301 12 2FFFF732. 122N1N A2 2l 2mm.mm.NN7657650 01981981 12 22 22 22 22 21 11 11 11 11 1 EAlFlAAEAlFlAA2022-3-3633030AA1A2l 1l 2A30A1 1l 12mABCF301 12 2A2 2l 2A330cos1222llAAAAAA 30sin30tantan3012232llAAAA mm.)()(7 78 83 32 23 32 22 22 23 3 AAAAAA2022-3-36

10、4 （FFFFFF鉚釘鉚釘(rivet)2022-3-365mFFAB d 1 1 12022-3-366nnFF 2022-3-367mmF剪切面剪切面FS FFmm00S FFFxFF SAFS 2022-3-368mmF剪切面剪切面FFmm AFSnu u 2022-3-369FFFF2022-3-370FF bsbsbs AFAFbsbs 2022-3-371hbsAdh2022-3-372 bsbs FA bsbs SFA AFbsbs SFA u 2022-3-373bhlMeFMee2MdF kNe5 57 71 10 07 70 01 10 02 22 22 23 33 3 d

11、MF2022-3-374MeF MPa6 .281010020105763SblFAFFF S bsbsbsMPa. 3 39 95 51 10 06 61 10 00 01 10 05 57 72 26 63 3hlFAFbhl2022-3-375 1FFA 1Bd2022-3-376 1FFA 1Bdd2F2FF剪切面剪切面2022-3-377d2F2FFF2SFF 24dA MPa51SAF1 2 bsbsbsMPa 150150tdFAF剪切面剪切面2022-3-378DdhF2022-3-3792022-3-380DdhF22bs()4DdA dAdh2022-3-381 d2022-3-382F dF 24FFdA 2022-3-383F dF dFAFS2022-3-384FF 2022-3-385FF