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1、摘要隨著有限元技術(shù)的飛速發(fā)展,運(yùn)用計(jì)算機(jī)進(jìn)行數(shù)值模擬已經(jīng)成為一種研究手段,越來(lái)越廣泛地應(yīng)用于混凝土侵徹問(wèn)題的領(lǐng)域。本文的工作就是在參閱大量文獻(xiàn)的基礎(chǔ)上,運(yùn)用比較成熟的有限元軟件ANSYS/LS—DYNA程序,圍繞混凝土靶板侵徹問(wèn)題的數(shù)值模擬展開的。具體工作如下:l對(duì)混凝土侵徹問(wèn)題進(jìn)行了綜述,分析討論了混凝土侵徹問(wèn)題研究的歷與現(xiàn)狀,為后續(xù)工作奠定基礎(chǔ)。2選取靶板厚度、混凝土強(qiáng)度、彈丸頭部幾何形狀和撞擊速度四項(xiàng)參數(shù),建立模型對(duì)混凝土靶板侵徹問(wèn)題進(jìn)行數(shù)值模擬,分析了各個(gè)參數(shù)對(duì)混凝土靶板侵徹的影響,并分析了各個(gè)參數(shù)影響大小的關(guān)系。3.對(duì)
2、眾多的經(jīng)驗(yàn)公式進(jìn)行調(diào)研,選取有代表性的公式,在公式的適用范圍內(nèi),利用H.J.C本構(gòu)模型對(duì)其進(jìn)行數(shù)值模擬分析。數(shù)值計(jì)算結(jié)果與經(jīng)驗(yàn)公式所計(jì)算的結(jié)果很接近,既驗(yàn)證了經(jīng)驗(yàn)公式的可靠性,同時(shí)也說(shuō)明數(shù)值計(jì)算方法具有重要參考意義。4.針對(duì)單層混凝土靶板和三層混凝土靶板進(jìn)行數(shù)值模擬分析,確定了防護(hù)層數(shù)對(duì)工程防護(hù)能力的影響。在靶板厚度相當(dāng)?shù)那闆r下,多層靶板的防護(hù)能力優(yōu)于單層靶板的防護(hù)能力;增加靶板層數(shù)對(duì)于防護(hù)能力的提高有重要意義。最后,對(duì)全文的研究工作進(jìn)行了總結(jié),并討論了今后進(jìn)一步深入研究的工作。關(guān)鍵詞:混凝土,侵徹,ANSYS/LS—DYNA,
3、數(shù)值模擬.I.ABSTRACTWi也therapiddevelopmentofFiniteElementAnalysisMethod.numericalsimulationsoncomputersarewidelyusedinthefieldofpenetrationagainstconcretetargetsasaneffectiveapproach.Onthebaseofmanyreferences,thepapermakesnumericalsimulationsaboutpencilingtoconcreteUSingA
4、NSYS/LS.DYNA¨whichiSawell—developedfiniteelementanalysisapplication.nlemainWOrkofthispapercanbesummarizedasfollows:1.Thepapermakesageneralintroductionaboutthepenetrationagainstconeretetargetsinthepastandatpresent,andthispaperalsolaysafoundationforthefollowingwork.2.T
5、henumericalsimulationsofthepenetrationagainstconcretetargetsareperformedwiththeparameterofthetargetthickness,theconcretestrength,thenoseshapeandthevelocityoftheprojectiles,therelationshipamongtheeffectsoftheparametersisanalyzed.3.Thispapermakesasurveyofmanyempiricalf
6、ormulas,andnumericalsimulationsaleperformedintherangeoftypicalformulaswi血theconstitutivemodelH—J—CTheresultsofthesimulatiOnsalealmostthesameasthoseoftheformulas,SOthesimulationsvalidatedtheresultsoftheempiricalformula.Themethodofsimulatingisprovedtobeusefulasareferen
7、ce.4.Theeffectofdecknumberontheprotectionabilityispresentedbythesimulationbetweensingledeckconcretetargetandtripledeckone.Theprotectionabilityoftripledecktargetisbetterthanthatofthesingledecktarget,andincreasingthenumberofdeckishelpfultoimprovetheprotectionabilityofp
8、rotectionWOrks.Attheendofthepaper,asummarizationispresented,andthefialrtherresearchesneedtodoarelisted.Keywords:concrete,penetratio