愛(ài)軸向沖擊圓柱殼塑性動(dòng)力屈曲實(shí)驗(yàn)研究及數(shù)值仿真.pdf

1、太原理工大學(xué)碩士學(xué)位論文愛(ài)軸向沖擊圓柱殼塑性動(dòng)力屈曲實(shí)驗(yàn)研究及數(shù)值仿真姓名：王根偉申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：固體力學(xué)指導(dǎo)教師：馬宏偉2001.4.1AbstraetInthepresentpapeLthedynamicplasticbucklingofcylindricalshellsunderaxialimpactarecarriedoutbyexperimentalinvestigationandcomputersimulationF

2、irstofall，byusingHopkinsonbarandDrophammertheexperimentalinvestigationondynamicbucklingofcopperandsteelcylindricalshellsunderaxialimpactisgivenWiththedifferentvelocities，theaxisymmetricshaped，non—axisymmetricovalshapedan

3、dtriangle—shapedbucklingmodesarefoundintheexperimentsThefirstcriticalvelocityandthesecondcriticalvelochyaledefinedaccordingtothedifferentbucklingmodesThecorrespondingcriticalenergyisalsodefinedStrainmeasurementresultssho

4、wthatthestrainratereverseoccurseveniftheimpactvelocityislowerthanthesecondcriticalvelocityThisresultisdifferentfromthehypothesisgivenbytheformerinvestigatorSomenewbucklingphenomenaareobtainedinthepresentexperimentsComput

5、ersimulationsshowthattheimperfectionisnotthenecessaryreasonforthenon—axisymmetricbucklingmode，thatis，thenon—axisymmetricbucklingmodeisrelatedtotheimpactvelocitythegeometricalandmaterialparametersofshellsThestrainratereve

6、rseandsomeinterestingresultsofstresswavepropagationalealsoobtainedbycomputersimulationThesimulationresultsareagreedwitlltheexperimentsweIIKeyWords：cylindricalshell，dynamicbuckling，bucklingmodescomputersimulation，critical