薄壁椭球壳在冲击载荷作用下的动态变形模型

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中图分类号：0347 国标学科代码：13015 文献标志码：A

Dynamic deformation model of thin-walled ellipsoidal shells under impact loading

FAN Shengyang， LI Jianqiao （StateKeyLboratoryofExploioniencedfetyrotectioneiingItitutefchnologyejingo，na）

Abstract：Inorder to studythe deformationcharacteristics of thin-walled ellpsoidal shells under localized impact loading， experimental investigationsandnumerical simulationswereconducted.The global deformationcharacteristics，centraldent depthaddentboundaryof therecoveryellipsoidalshellimpactedbycylindrical projectilesatdiferentvelocitieswere obtained by projectile impact testson a light gas gun apparatusandthree-dimensional digital imagecorrelatio （DIC） technologyfordeformation processrecord.Thesimulationanalysis focusedonthe effectsof three diferent curvatureradiion the depression depth and the lengths of the major and minor axes of theelipsoidal shell.Theprimary dimensionless independentvariablesonwhich the dimensionlessdeformationcharacteristics dependweredetermined bymeansof dimensional analysis.Theinfluence of lesssignificant parameters was reduced through parameter sensitivity analysis.Under theconditionofmaintaingconsistentsalingatiosformateralproperties，projectiledimensions，ndshelltckess，peific response surface function expressonsbetween dimensionlessdeformationcharacteristics vs.three curvature radiiandvelocity parameters were derived.Aformula for predicting global deformation based on the depth of thedepressionand the depression boundary was proposed.The established expression can well describethesize effect and has ahigh predictionaccuracy，and can provide reference for the design of impact load protection oflarge-sized curved thin shels in engineering.

Keywords：thin-walledelipsoidalsell;impactload;stereodigitalimagecorrelationtechnology;dimensionalanalysis; response surface model

曲面薄壳结构具有优良的承载能力，被广泛应用于管道、土木工程、航空航天、海洋工程等领域，如建筑物的曲面穹顶结构、压力容器以及整流罩结构等[]。（剩余16703字）