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摘要: 利用ANSYS/LS-DYNA程序,采用Lagrange方法和Johnson-Cook本构模型,对长径比为5的平 头钨合金长杆弹、分段体长径比为1的理想分段杆和带套筒的分段杆侵彻半无限厚钢靶进行了三维数值模 拟。给出了侵彻过程中典型时刻的物理图像,并对3种杆的侵彻性能进行了比较。结果表明:分段杆侵彻深 度的主要贡献在相Ⅲ惯性扩孔阶段而非连续长杆的相Ⅱ准定常侵彻阶段;分段间隔对侵彻深度的增加有显 著影响;套筒的贡献主要在于弹坑直径的增加而对侵深影响微小。
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关键词:
- 固体力学 /
- 侵彻深度 /
- Johnson-Cook本构模型 /
- 分段杆 /
- 半无限靶
Abstract: Numericalsimulationswereconductedonthepenetrationofthelongrodwiththelength-radialratioof5, theidealsegmentedrodandthesegmentedrodwithacarriertubeintosemi-infinite steeltargets,respectively,byusingthesoftwareANSYS/LS-DYNA3D.TheLagrangianmethodand Johnson-Cookconstitutivemodelwerecoupledinthenumericalsimulations.Thevon Misesestress contoursweregivenatthetypicaltimesduringthepenetrationandthepenetrationperformancesof theserodswerecompared.Comparisonshowsthatthedominantcontributiontothedepthofpenetration( DOP)ofthesegmentedrodisduetothephaseⅢnon-steadystageratherthanthephaseⅡquasi- steadypenetrationstageinthelong-rodpenetration.Theinterspacingofthesegmentedrodshasa significantimpactontheDOP,whilethecarriertubeonlycontributestotheincreaseofthecraterdiameter.-
Key words:
- solidmechanics /
- depthofpenetration /
- Johnson-Cookmodel /
- segmentedrod /
- semi-infinite steeltarget
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