在沖擊載荷作用下的梁板結(jié)構(gòu)動(dòng)態(tài)屈曲研究.pdf

1、大連理工大學(xué)碩士學(xué)位論文在沖擊載荷作用下的梁板結(jié)構(gòu)動(dòng)態(tài)屈曲研究姓名：許弘柱申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：工程力學(xué)指導(dǎo)教師：徐新生2001.6.1摘要DynamicBucklingofStructuresofBeamsandPlatesontheAxialImpactedLoadAbstractThedynamicbucklingofelasticstructures，suchasbeamsandplates，whensubjectedtoan

2、axialimpactatoneendisstudiedinthepresentpaperbasedonthetheoryofstresswavepropagationStresswavesareboundtofollowwhenstructuresareimpactedalongtheaxialdirectionItiSforthepropagationoflongitudinalwavesthatt11ebucklingofthes

3、tructurestakesplaceandgrowsInthecourseofthestresswavespropagating，thebucklingofstructuresappearslocallyEndconditionsandconsistencyconditionsatastresswavefrontaswellasthebifurcationconditionsofthedynamicbucklingareformula

4、tedaccordingtothesolutionofdisturbingequationsobtainedinthisPaDerCriticalbucklingloadsandtheassociatedbucklingmodesarepresentednletimeofbucklingdependsontheimpactloadIngeneral，whentheloadiSlargethebucklingoccursinshortti

5、meandthelocalpositionofthebucklingmaybeneartheimpactendofthestructuresSometimes，thebucklingappearsclosetotheotherend，whichiSbecauseofthereflectionofstresswavesThecriticalIoadisdeterminedbytheconditionofbifurcationandiSde

6、pendentonpropertiesofthematerialgeometricparametersandsupportingconditionsofstructuresbesidestimeInthesameinstantthecriticalbucklingloadsvaryundervarioussupportendconditionsietheloadiSbiggestforfixedsupportsmallerforsimp

7、leandthe10westforfreeItiSshowedthatanon—symmetricbucklingmayOCCurinthesymmetricstructureswhenasymmetricimpactedloadiSappliedWitllthewallthicknessincreasingforplatesnon—symmetriccritical10adiSlarger也ansymmetriconeandwithi

8、tdecreasingthenonsymmetriccritical10admaybethelowerthansymmetriconeThebucklingformSorcorrugationsaredependentontheloadWallthicknessandSOonForstructuresofvariable—crosssectionstresswavesmaytransmitandreflectinthepropagati