型材弯曲中截面变惯性矩的计算

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2010.01:,,,,,。:;;Abstract:Thepaperisbasedonthedefinitionofmomentofinertiaandsomebasicnumerationformula.Italsocombineswiththebasicprinciplesofbending.Itconsiderstwosidesoftheshiftofneutrallayerofcross-sectionandtwistingdistortionofcross-sectionforbendingofprofile.Thepaperexplainsthechangesofmomentofinertiaforthebendingprocessandgivesthenumerationformulaofmomentofinertia.Itprovidesthetheoreticalbasisforautomativebending.Keywords:momentofinertia,neutrallayer,twisting,。,,、、、。,、、、。,:,,,,[1]。:,,;、;[2]。,[3]。,,。。11.11,A。yz。(y,z)dA,Ayz,yz。(1),z2y2,IyIz。[4]。Iy=A乙z2dAIz=A乙y2d乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙A(1)1:,,,,,。:;;Abstract:Thepaperisbasedonthedefinitionofmomentofinertiaandsomebasicnumerationformula.Italsocombineswiththebasicprinciplesofbending.Itconsiderstwosidesoftheshiftofneutrallayerofcross-sectionandtwistingdistortionofcross-sectionforbendingofprofile.Thepaperexplainsthechangesofmomentofinertiaforthebendingprocessandgivesthenumerationformulaofmomentofinertia.Itprovidesthetheoreticalbasisforautomativebending.Keywords:momentofinertia,neutrallayer,twisting,。,,、、、。,、、、。,:,,,,[1]。:,,;、;[2]。,[3]。,,。。11.11,A。yz。(y,z)dA,Ayz,yz。(1),z2y2,IyIz。[4]。Iy=A乙z2dAIz=A乙y2d乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙乙A(1)1212010.011.2,(1)(2)。2。2Iy=Iyc+a2AIz=Izc+b222A(2),,,,,。[5-6],,,,。1.3,,,。,。(3),(4)。3,Oα;,y1,z1。y1=ycosα+zsinαz1=zcosα+ysin22α(3)Iy1=Iy+Iz2+Iy-Iz2cos2α-Iyzsin2αIz1=Iy+Iz2-Iy-Iz2cos2α+Iyzsin2αIy1z1=Iy-Iz2sin2α++Iyzsin22222222222222222222222222222222222222222222222(4)Iy,Izy、z,Iyzy,z。32,:a);b),;c),。3,,,。3.14a,4b。,,,,,,,C-C,,,,。,[7],222010.014aC-Cc-c。,,4b。4y,z,,y,zIy、Iz,dy,dy,A,:Iy1=Iy+AdyIz1=Iz(5),,。,,,,。3.2,,,。,:,,,。,,,。[8-9]。5,Ф,。5,yoz,Ф-Ф,y0oz0。y,zIy1、Iz1,Iy1z1,6。6-Фα,:Iy0=Iy1+Iz12+Iy1-Iz12cos(-2Φ)-Iy1z1sin(-2Φ)Iz0=Iy1+Iz12-Iy1-Iz12cos(-2Φ)+Iy1z1sin(-2Φ)Iy0z0=Iy1-Iz12sin(-2Φ)+Iy1z1cos(-2ΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦΦ)(6),,。4、,,,,232010.01。:[1].———[J].,2003:79-80.[2].[J].,2003.25:66-68.[3].[J].,2007.27(4):56-57.[4].(I)()[M].:,2004.[5].[J].,2005.21:72-74.[6].L[J].,2001.3(2):34-37.[7],.[J].,2002.9(2):39-41[8],,.[J].,2005.(2):7-9[9],,.[J].,2006.34(9):1170-1174.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!2009,2009“”,113。,、,、、。,113451,361,80%。,。,,。,1000,800,361。!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!,,。,,。,,、、。,。,。,,。,。24

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