新⑧北科大《材料力学》总复习课件.pdf

《新⑧北科大《材料力学》总复习课件.pdf》由会员分享，可在线阅读，更多相关《新⑧北科大《材料力学》总复习课件.pdf（66页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、?NN 0 x?AMn 0 x?AMnAMQM 0Q 0 x?x?AxN)(?LxxEAxNLLd)()(d?O?pnIM?)(zxIMy?xyzzybIQS?ABxGIMABLpnABd?fx?f?fEIxMxf)()(?xO O O O O O O O O O O O O O O O O O O O O?MM?)(?max?maxmin?NA?max?AN?max?|max?ntMW?|max?tnWM?max?max?max?MWz?max?zWM?max?max?LfLf|maxxEAxNULd2)(2?xGIxMULnd2)(2?xEIxMULd2)(2?xma a a a a a

2、ax x x x x xtn nm m m m m max?A?A?(?Pi?Pj?A?)?)()(jiAnmmM?)()(jAiAAPmPm M?jiAPP Q?)()(jiAPPN?i i i i i i i?j j j j j j j?xqxxQ?dd)(d)(dxQxxM?)(d)(d22xqxxM?Q?M?Q?M?q=0q0q0QQ0 x?xQxQ?xQCQ1Q2Q1Q2=P?xQC?xM?xM?xM?xM?m?xM?P?MxM1M2mMM?21?x x x x x x x xxQ Q Q Q Q Q Q?Q Q Q Q Q Q Q Q?jhdK?211:(1)?jgvdK?2:)2

3、(?p?e?s?bsab?p?t?e?fgh?MPa?0.050.100.150.200.25450400350300250200150100500?pe?!njx?:1?,2.0 :2bsjx?3?n?G?E)1(2#?EG?bnn?PPPcnnQh?bh?1Mn?max?b?!?AQ!ccccAP?3maxmax :bpWWMPn$?4 :,bIGIMPPn%?max1?P P P P P P P P P P P P Pc c c c c c c c c cP Pnn?64:643443nRGdKKPGdnPR?;615.04414 ;83maxdD CCCCkdDPk?&?;?;?Pxy

4、zO3max8)12(dDPDd&?d d d d d d d?)()(xMxfEI?1d)()(CxxMxfEI?21d)d)()(CxCxxxMxEIf?1?PABCPD?0?Af0?Bf0?Df0?D?CCff?CC?CC?CCff?D D D D D D D D D D D D DB B B B B B B B B B B B BC C C C C C C?C C C CABCMPABCDKBCAPBCAPD?K K K K K K K K K K KB B B B B B B B B B B B B B B B B B BA A A A A A A A A A A A?+=CqPAB

5、aaPABqAB?21fff?PL1L2ABCxffBCPL2f1xff2PL1L2ABCM=+?f f f f f f f f f f f f f?x?AAAAQEIMEIf?;EIQEIMfxxxx?;?a?b?c?)()(xMxq?A A A A A A A AA A A A A A A A A A A A A A A A A A A A?a a a a a a a a a a a a?b?321?2?1xyz?33?2?1?%?%?231max?max?x3 3 3 3 3 3 3 3 3 3?()*?%?%?%?%?%2cos2sin22sin2cos22xyyxxyyxyxxy?x

6、?xy?yO?y?xy?x?%?%xyO?n?2x x x x x x xy y y y y y y yx x x x x?xy y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y y yO O O O O O O O O O O O O O O O O O O?yxxy?%?22tg0?+?00%?2222xyyxyxm inm ax?()*?()*?xy?x?xy?yO?,?x?y?min2max1 ;?1?2?2 2 2 2 2 2 2 2 2 2x x x

7、 x x x x x xy y y y y y y y y y y yy yin?x?xy?yxyOn?%?%O?%?%A(?x,?xy)B(?y,?yx)2%nD(?%?,?%?xC?O O O O O O O O%nD D D D D D(%,%?A?x?%?xyyx?,%?%2sin212cos22xyyxyx?%?%2cos212sin22xyyx?()*()*?xyy y y y y y y yy y y y y y y y y y y y y y?Strain Circle?%-.-.ABC?A A A A A A A A A A A A A AC C C C C C C C?Gi

8、jij?!kjiiE?#?1),(zyxkji?xyz?z?y?xy?x?iji i?!?1*1?3212?#?!213232221421?313?()*()*!/0ns?,2.0b?31?yLM?My?Mz?xyzPyPzPPzPyyzP?Lmmx?x x x x x x x x x x x x xP P P P P P P P P P P P P P P P P P P P P PyP PzP P P P P P P P P P P P P P P?0?1maxDL?2maxDy?22zyfff?PzPyyzP?D1D2%?ffzfy$?2 2 2 2 2 2 2 2 2 2 2D D D

9、 D D D D D D D D D D D223134?WMMMnzy222*3?1xB?1B?xB1B2MyMzMnM?1 1 1 1 1 1 1 13 3 3 3 3 3 3 31 1 1 13 3 3 3 3 3 3 3 3 3 31 1 1 13?BMy y y y y y yMM?!213232221421?223?WMMMnzy222*475.0?1xB?1B?2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2*4 4 4 4 4 411B?PMZMyAPxP?zzxMIyMz?yyxMIzMy?yyzzxIzMIyMAP?xyzPMyMz?MMZx x x x

10、x x x xP P P P P P P P P P P P P P P P P P P P P P P?P?zP?yP?yz012020?yPzPizziyy?yz?),(PPyzP?ayaz?2 2 2 2 2 2 2 2 2 2 2 20 0 0 0 0 0 0 0 0 0z z z z z z z z z zP P P P P P P P P P P P P?ay ya?iL#1 1?cr?221 1&?Ecr?1 1?bacr?P?S?bass?1?1PPE?&?&12?2c c c c c c c c cr r r r r r r rc c c c c c c c cr r r r

11、 r r r r r rP P P P P P P P P?!WcrWn?!?W?1?,?!WAP?WWWWWWWWWWWWWWWWWWWWn n n n n n n n n?W?xEIxMxGIxMxEAxNULLPnLd2)(d2)(d2)(222?LPnnLAxGIxMxMxEAxNxNd)()(d)()(002xEIxMxMLd)()(0?LP PL LL L L L L L L L L Lnn n n n n n nnn n n nn n?M0(x)?M(x)?M0?M(x)?)?n?nPU33332 2?U?Pn?Pn?2 2n n?Pn?Pn?2 2n n?Pn?2 2n n?P

12、n?P P P P P P P P P P P Pn n n n?33?33?33?33?LnLnnPLnnnxPxMEIxMxPxMGIxMxPxNEAxNPUd)()(d)()(d)()(n2?L L L L L L L Ln n n n n n n n?:4321?RRRR?0?U?)(444332211RRRRRRRREU?)(44321?KEUR1R2R3R4I1,2I3,4ABCD?4321?4 4 4 4 4 4 4 4 4 4 4 4 432?yxxy?%?02tg%?%?%2cos212sin222sin212cos22xyyxxyyxyx?!22minmax)()(21xy

13、yxyx?4?()*?xy y y y y y yxy y y y y y y y y y?)(21?Ch?)(2121?Cnn?,?,?.?.?.?2)sin2sin(:1&5?aKI?0?I02sin?5?0sin?1&?hNfhNC?1?)(21f?a?b?c?2)cos(:1&?aKI?0cos?1&1)5.0(?m.0.5,0?m.1.5,1?m?.?.?()*66?)(;)(;minmaxminmaxmaxminmaxmin?r?2minmax?a?2minmax?m?m?min?maxTt?a?()?maxr r r r r r r r r r r rT T T T T T T?

14、r0?r?K?rrK?$?0$?r=?1?rrK?$?0?1 1 1 1 1 1 1 1 1 1 1 1 1?!rorrKnn?$?1max?r r?0 20 40 60 80 100320300280260240220200?s?MPa?MPa/s?t dd?7?3?320 0 0 0 0 0300 0 0 0 0 0 0 0 0 0 02 2 2 2 2 2 2 2 2 2 28 8 8 8 8 8 80 0 0 0 0 02 2 2 26 6 6 6 6 6 6 6 60 0 0 0 0 0 0 0 02 2 2 2 2 2 2 2 2 2 2 2 26 6 6 6 6 6 6 6 6

15、6 6 60 0 0 024?s s s s s?P P P P P P P P P P P Pa a a a aMMMMMMMMMMMMP P P P P?260?b?2?5?260?E?S?b?2?5?)(C?)MPa(?)GPa(E0 100 200 300 400 500216177137700600500400300200100100908070605040302010(%),52ES?2b?5?260)MMMMMMMMMMMMMMMP P P P P P P Pa a a a a a a a a a a(?177 7 7 7 7 7 7 7 713 3 3 3 3 3 3 37 7

16、 7 7 7 7 7 77 7 7 70 0 00 0 0 0 0 0 0 0 0 0 0 06 6 6 6 6 6 6 6 6 6 6 6005?8?8?P?P?tOABCDE?0?C?1.?4055405510101010?452R 0.52R1V?U?1 1 1 1 1 1 1 10 0 0 0 0 0 0 0 0 0 0 0 010 0 0 0 0 0 0 0 0 0?4 4 4 4 4 4 4 45 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R 0 0 0 0 0 0 0.5 5 5 5 5 5 5 5 52.?U?AWk?%?V?Wk?%?Wk k k k k k k k k k k k k?