英汉双语材料力学10.ppt

《英汉双语材料力学10.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、CHAPTER10STABILITYOFCOMPRESSEDCOLUMNS1材料力学第十章压杆稳定2CHAPTER10STABILIZATIONOFCOMPRESSIVECOLUMNS§10–1CONCEPTSOFSTABILITYOFCOMPRESSEDCOLUMNS§10–2EULER’SFORMULAOFTHECRITICALFORCEOFSLENDERCOMPRESSEDCOLUMNS§10–3CRITICALSTRESSOFCOMPRESSEDCOLUMNSASSTRESSEXCEEDSPROPORTIONALLIMIT§10-4STABILIT

2、YCHECKANDREASONABLESECTIONOFCOMPRESSEDCOLUMNS3第十章压杆稳定§10–1压杆稳定性的概念§10–2细长压杆临界力的欧拉公式§10–3超过比例极限时压杆的临界应力§10-4压杆的稳定校核及其合理截面4§10–1CONCEPTSOFSTABILITYOFCOMPRESSEDCOLUMNSTheload-carryingcapacityofstructuremembers：①Strength②Rigidity③StabilitySomestructuremembersinengineeringhaveenoughstr

3、engthandrigiditybuttheyareunabletoworksafelyandreliably.STABILITYOFCOMPRESSEDCOLUMN5§10–1压杆稳定性的概念压杆稳定构件的承载能力：①强度②刚度③稳定性工程中有些构件具有足够的强度、刚度，却不一定能安全可靠地工作。6PSTABILITYOFCOMPRESSEDCOLUMN7压杆稳定P81、Stableandinstableequilibrium：1).instableequilibriumSTABILITYOFCOMPRESSEDCOLUMN9一、稳定平衡与不稳定平衡：压

4、杆稳定1.不稳定平衡102).StableequilibriumSTABILITYOFCOMPRESSEDCOLUMN11压杆稳定2.稳定平衡123).StableandinstableequilibriumSTABILITYOFCOMPRESSEDCOLUMN13压杆稳定3.稳定平衡和不稳定平衡142、Lossofstabilityandthecriticalpressureofthecolumn：1).Idealcompressivecolumns：thematerialisabsolutelyideal；theaxisisabsolutelystra

5、ight；thecompressiveforceisabsolutelyalongtheaxisofthecolumn.2).Stableandinstableequilibriumofcompressivecolumns：STABILITYOFCOMPRESSEDCOLUMNInstableequilibriumStableequilibrium15二、压杆失稳与临界压力：1.理想压杆：材料绝对理想；轴线绝对直；压力绝对沿轴线作用。2.压杆的稳定平衡与不稳定平衡：稳定平衡不稳定平衡压杆稳定163).lossofstabilityofcompressedc

6、olumn：4).CriticalpressureofcompressedcolumnsStableequilibriumInstableequilibriumCriticalstateCriticalpressure:PcrcorrespondingpressureSTABILITYOFCOMPRESSEDCOLUMNintermediatestate173.压杆失稳：4.压杆的临界压力稳定平衡不稳定平衡临界状态临界压力:Pcr压杆稳定18§10–2EULER’SFORMULAOFTHECRITICALPRESSUREOFSLENDERCOMPRESSE

7、DCOLUMNS1、Criticalpressureforthecolumnwithtwohingedends:①bendingmoment：②ApproximatedifferentialequationofthedeflectioncurvePPxyPMSTABILITYOFCOMPRESSEDCOLUMNSupposethepressurehasreachedthecriticalvalueandthecolumnhasbeenintinybendingstateasshowninthefigure.Starttodeterminethecritic

8、alforcewiththedeflectivecurve.PxL