叠梁纯弯曲正应力的理论与实验分析

85201010ExperimentScienceandTechnologyVol.8No.5Oct.20102010－03－192007。1973－。412008。AB11。。O341B1672－4550201005－0003－03TheoreticalAnalysisandExperimentalVerificationofNormalStressofStackedBeamsTANGFan-huaZHUFang-caiLIXi-pingLU¨Jing-jingCollegeofCivilEngineeringHunanUniversityofTechnologyZhuzhou412008ChinaAbstractBasedonplanecross－sectionassumptionofnormalstressdistributiononcuttingsectionaformulaisputforwardconsid-eringtightbondingwithnoslippage．AnaluminumbeamandasteelbeamisstickedwithABgluetoformastackedbeamthenae-lectricmeasurementtestisdesignedtostudynormalstressdistributionofcuttingsection．Testresultsshowsthatwithtightbondingbetweencontactsurfacesoftwobeamsthetwobeamscanbeconsideredasaunitbeamandnormalstressonthecuttingsectionsat-isfiesplanecross－sectionassumption．Keywordsstackedbeampurebendingnormalstressneutralaxis1σ=My/Iz。、。。。21－42.11。E1E2E1＜E2。x。xyε=yρρ。12σ1σ2201010σ1=E1ε=E1yρσ2=E2ε=E2y{ρ111∫A1σ1dA1+∫A2σ2dA2=FN=0∫h+xxE1yρbdy+∫x0E2yρbdy－∫－h－x0E2yρbdy=FN=0x=E2h2－E1h22E1h+E2h2y。2.2yz2∫A1y1σ1dA+∫A2y2σ2dA=M∫h+xxE1y2bρdy+∫x0E2y2bρdy+∫0－h－xE2y2bρdy=M1ρ=3ME1bh3+3h2x+3hx2+E2bh3+3hx2－3h2xσi=3MyEiE1bh3+3h2x+3hx2+E2bh3+3hx2－3h2x3yEihbx。32。《Ⅱ》。3。3520mm×20mm。AB。2。22x=5mm。70G/a200G/aa=120mm。2。1/4F0=250N100N5σ=Eε。ab362·4·20108、、。、、、、。1.J.2009146.2.M.櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴櫴2003.432415mm。。、。4。abc4yz4a。4b04c。2。、。4。。。1.ⅡM.2002.2.J.200425554－56.3.J.200426474－76.4.J.200220428－30.5.J.2007263101－109.·26·