材料力学第六版PPT-第二章 拉伸、压缩与剪切

1、Chapter2 2021-12-162Chapter22021-12-163 2021-12-1642021-12-1652021-12-166 FFFF2021-12-167mmFF2021-12-168mmFFNmmFF2021-12-169mmFFmmFFN2021-12-1610FNmmFFmmFFNmFm2021-12-1611FNmFFmmFFNmFm2021-12-1612xFNO2021-12-1613CABD600300500400E40kN55kN 25kN20kN2021-12-1614CABD600300500400E40kN55kN 25kN20kNCABDE40k

2、N55kN 25kN20kNFRAkN100202555400RR AAxFFF2021-12-1615CABDE40kN55kN 25kN20kN10R1N AFF)()kN(10R1N AFF2021-12-1616 F40kNFN220kNCABDE40kN55kN 25kNF2040R2N AFF)()kN(5040R2N AFF2021-12-1617FN320kN25kNCABDE40kN55kN 25kN20kNF30 02 20 02 25 53 3 NF)()kN(53N F2021-12-161820kNFN440kN55kN 25kN20kNF4)(kN)204N F20

3、21-12-16195010520+CABD600300500400E40kN55kN 25kN20kN(kN)50Nmax F2021-12-1620FFabcd2021-12-1621FFabcda b c d 2021-12-1622 F FN2021-12-1623AFN 2021-12-1624Fkk F coscos AFAFpFkkFp AFp cosAA FF 2021-12-1625 2coscosp sinsin22p Fkk FFkkxn p2021-12-1626 Fkk FFkkxn p2021-12-1627 max2 2 max2 2 min0 00 0 ,2co

4、scospsinsin22p xnFkk 2021-12-1628Nmaxmax AFNmax FA NmaxAF AFmaxN 2021-12-1629FABCFF3000400037024021kNN50501 1 FFkNN1 15 50 03 32 2 FF2021-12-1630FABCFF300040003702402150kN150kNMPa.N/m.2N8 87 70 01 10 08 87 70 02 24 40 02 24 40 05 50 00 00 00 06 61 11 11 1 AF MPa.N/m.2N1 11 110101 11 137370 037370 01

5、500001500006 62 22 22 2 AF max 2021-12-1631ABCF1m2021-12-1632ABCF1mFAxy2021-12-1633FAxy0 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 AA2021-12-1634AFmaxN FFFF732. 122N1N kN.N2 24 43 36 69 91

6、11 1 AF kN.N2 20 04 48 86 62 22 2 AF kN.N6 61 18 84 42 21 11 1 FFkN.N7 72 28 80 07 73 32 21 12 22 2 FF2021-12-16352aaFABDC2021-12-16362aaFABDCCDFACBFFMCDA230N /N232119MPa4CDFFAd N AFCDCD2021-12-1637F=33.5kN2aaFABDCCDFACB2 23 3FAFCD N N AFCDCD/N 2 23 3FFACD / 2324dF 2021-12-1638 2021-12-16392021-12-1

7、640 dl标距标距2021-12-1641FOlefhabcddgfl02021-12-1642 p E p fOfha2021-12-1643e p fOfhab es 2021-12-1644 s b b e p fOfhabce2021-12-1645 s b e p fOfhabce2021-12-1646 %1 10 00 01 1 lll %1001001 1 AAA 2021-12-1647 abcefOgfhdd2021-12-1648pe abcdefOdgfhd2021-12-1649 2021-12-1650 0.2 0.20.2% tan E2 20 0. oO /M

8、Pa/% 2021-12-16512021-12-1652dh0 03 35 51 1. dh2021-12-1653 sO 2021-12-1654O /% 2021-12-1655nu ssn bbn 2021-12-1656max max 2021-12-1657max max Kmax 2021-12-1658 FFbh h1 lllll 1 12021-12-1659bbbbb 1 1 FFbhh1 bbb 12021-12-1660 AFN ll E EAlFlN 2021-12-1661F1F2F3l1l2l3ABCD2021-12-1662F1F2F3l1l2l3ABCDF1F

9、N1)(kN2001N1N1 FFF2021-12-1663F2F1FN2F1F2F3l1l2l3ABCD)(kN1502N2N21 FFFFFFN3)(kN5003NR3N FFFD2021-12-1664FN2 =-15kN （-）FN1 =20kN （+）FN3 =- 50kN （-）15+-2050F1F2F3l1l2l3ABCD2021-12-1665FN2 =-15kN ( - )FN1 =20kN （+）FN3 =- 50kN ( - )F1F2F3l1l2l3ABCD)(MPa.N 8 81761761 11 1AFAB )(MPa.N 6 674742 22 2AFBC )(

10、MPa.N 5 51 11 10 03 33 3AFDC 2021-12-1666F1F2F3l1l2l3ABCDm102.534-N 1 11 11 1EAlFlABm101.424-N 2 22 22 2EAlFlBCm101.584-N 3 33 33 3EAlFlCD-0.3mm BCCDBllumm10-0.474- CDBCABADllll2021-12-1667ABC12 2021-12-1668ABC12 , ,FyA12 x0coscos00sinsin02N1N1N2N FFFFFFFyx cos22N1NFFF 2021-12-1669AABC12 ABC12 cosNE

11、AFlEAlFll2 21 11 12 21 1 2021-12-1670ABC12 A A2 2A1Al 1 12AAAAA )(mm293. 1cos2cos21 EAFllAAA2021-12-1671F FA12x30yA1 1l 12mABCF301 12 2FFFF732. 122N1N A2 2l 2mm.mm.NN7657650 01981981 12 22 22 22 22 21 11 11 11 11 1 EAlFlAAEAlFlAA2021-12-16723030AA1A2l 1l 2A30A1 1l 12mABCF301 12 2A2 2l 2A330cos1222ll

12、AAAAAA 30sin30tantan3012232llAAAA mm.)()(7 78 83 32 23 32 22 22 23 3 AAAAAA2021-12-16732021-12-16742021-12-1675CABDF 1 12 23 3xyFA 2 21 10 0NNFFFx 0coscos03N2N1N FFFFFy 2021-12-1676CABDF 1 12 23 3xyFA CABD 1 12 23 32021-12-16773 3l A1 12 23 3 CABDF 1 12 23 3CABD 1 12 23 31 1l cos3 31 1ll 1 11 11 11

13、1EAlFlN 3 33 33 33 3AElFl cosN 2 23 33 33 31 1cosNNAEEAFF 2021-12-1678CABDF 1 12 23 33 3l A1 12 23 3 1 1l 2 23 33 32 21 12 21 1coscosNNAEAEFFF 2 21 1NNFF 0 03 32 21 1 FFFFNNNcoscos 2 23 33 33 31 1cosNNAEEAFF 2 23 33 33 32 21 1cosNAEEAFF 2021-12-1679ABCF3aal212021-12-1680ABCF3aal21FABC3aa21FN1FN2FN3F

14、 0 xF0 xF 0 0yF03N2N1N FFFF 0 0BM0 02 22 21 1 aFaFNN2021-12-1681ABCF3aal21ABCl 3l 2l 1ABC3212 23 31 12 2 lll 1 11 11 11 1EAlFlN EAlFl3 33 3N EAlFl2 22 2N 2 23 31 12 2NNNFFF 2021-12-1682ABCF3aal21ABCl 3l 2l 1ABC321N2N3N1FFF2 2 0 0 xF0 0 FFFFN3N2N102N2N1 aFaF6/53/6/N3N2N1FFFFFF 2021-12-1683 AABCD 2 21

15、 13 3l2021-12-1684 AABCD 2 21 13 3ll 3l 13 3l1l3l 1cosl cos1 13 3ll3 33 33 31 11 11 1AElFlAElFlN3N1cos 2021-12-1685 AABCD 2 21 13 3ll 3 l 1 2 21 11 13 33 3cosN1N3AElFAElF0coscos0sinsinN2N1N3N2N1 FFFFF 2021-12-1686ABC12aaB1A1C1l3C1C2021-12-1687l3C1CABC12B1C1A1ell 3 31 12021-12-1688aaxEAlFl1 11 1N1 3

16、33 33 3AElFlN3 AElFeAElFN1N3 3 33 3CAB0 0 N2N1N3FFFN2N1FF 2021-12-1689AB2021-12-1690 ABABB0 0 lAB2021-12-1691ABAB0 0 FTlllEAlFlBFR lTllT EAlFlTBlR TEAFlBR TEAFlBTR BAB2021-12-1692（FFFFFF2021-12-1693mFFAB d 1 1 12021-12-1694nnFF2021-12-1695nnFF2021-12-1696mmF剪切面剪切面FS FFmm00S FFFxFF SAFS 2021-12-1697m

17、mF剪切面剪切面FFmm AFSnu u 2021-12-1698FFFF2021-12-1699FF bsbsbs AFAFbsbs 2021-12-16100 hbsAdh2021-12-16101 bsbs FA bsbs SFA AFbsbs SFA u 2021-12-16102bhlMeFMee2MdF kNe5 57 71 10 07 70 01 10 02 22 22 23 33 3 dMF2021-12-16103 MPa6 .281010020105763SblFAFFF S bsbsbsMPa. 3 39 95 51 10 06 61 10 00 01 10 05 57 72 26 63 3hlFAFMeFbhl2021-12-16104 1FFA 1Bd2021-12-16105 1FFA 1Bdd2F2FF剪切面剪切面2021-12-16106d2F2FFF2SFF 24dA MPa51SAF1 2 bsbsbsMPa 150150tdFAF剪切面剪切面2021-12-16107DdhF2021-12-16108DdhF22bs