材料力学：第六章弯曲应力1

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1、aaFFDCBAFFFSADCBFaMACDByzM0dN AAF 0d AyAzM MAyMAz d AAFdS yzdAFSdA横线横线纵线纵线aabbmmnnmmnnbbaaMM横线横线纵线纵线aabbmmnnmmnnbbaaMMMMzy yOdxyOO纵对称面纵对称面yOdO ddd y E AAFdN y yE AyEAd AAyEd 0 MMzSE0zS AyAzMd 0yzI AzAyMd AAzyEd MAyEA d2 yE 0yzIEAyIAzd2 zEIM 1zIyM AAyEMd2 yE 中性轴中性轴zzWMIMy maxmax maxyIWzz max MzhbzO6.

2、Iz 和 Wz 的计算的计算123bhIz 62bhWz DyzO323DWz 644DIz DdyzO 43132 DWzDd 44164 DIzIz 和 Wz 的计算的计算zEIM 130R4pmaxmax zIMyhIhIyIMzzzppmaxp22 m1104002104102002639p EhMEIRzzIyM zWMmaxmaxzIyMmaxmax mkN5.4834822max qlMMPa94.6106180120105.4923 zaWM q=4kN/m3mz120180bac50MPa86.310121801201050105.412333 zbbIMy MPa94.6

3、ac M(kN.m)4.5mkN3754101504max FlMMPa1601023401037563maxmax zWM F=150kN5mz166560a21MPa148106560010)21280(10375833 zaaIyM 5mM(kN.m)375CBAy4cm65600 zI3cm2340 zW40kN200kN/m500900400ABCDFAFCzyy2=142y1=4840kN200kN/m500900400ABCDFAFCM(kNm)7.1516zyy2=142y1=48zIyM 40kN200kN/m500900400ABCDFAFCM(kNm)7.1516zyy2=142y1=48 cZCcIyM MPa87101.261014210166332max tZBtIyM MPa9.38101.26101421015.76332max40kN200kN/m500900400ABCDFAFB tZCtIyM MPa4.29101.261048101663311maxM(kNm)7.1516zyy2=142y1=4840kN200kN/m500900400ABCDFAFCM(kNm)7.1516zyy2=142y1=48M(kNm)167.15M(kNm)7.15FQ2ql2qlM82ql