三维变形过程中空洞闭合的模拟研究

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1、三维变形过程中空洞闭合的模拟研究摘援奉文袋震数蕊模拟粳耱鬈模援耀结合瓣方法蹲热徽糖交形过稳锻坯内部空洞的闭合过程进行了研究。研究结果深化了对这一复杂问题的认识，对于采用合理工艺方法消除锻坯内部空洞缺陷有一定参：学价值。数傻羧熬采怒三缝大变影饔羧元模羧鼓寒，瑟痰藩荐在不爨尺寸不鼷位鬻鲶的单空洞或多空澜的45。钢圆柱体锻{牛的热镦粗过程进行∞余僻j搂拟舔究，发现在自由镦鞭的条毋下终漏形状经魇嶷躐球一耩球一裂稼静过校，最终空洞全部蝰合；空漏挝置接近端面，空澜耀合蹲所蓑愿下牵罐大：空漏闭岔过程中其灞围裙明显的纛力集中穗寝燮集

2、中，一般燕癸做墩瑰虢线形状分布，如果空澜为jS对称分布，剐类似玻瑰穑线靠近圆柱体中部一侧分布范围大；当圆柱体内存在多空濑潋(菇双空洞为铡)，戳尺寸大戆空洞瓣避变形范溺较大，嗣尺寸的硬空溺在交形过程中斌柱体中部多数有应力、应变的封闭餐僵线区域分布。物理模拟试传以聚碳酸酯粒料为原料，用人工方法控制其加热温度秘舞温速度，缆之农试转蠹部澎成空淀，褥瑟岗帮黉窆潺羚连续试佟。遁遗薅鬻空瀛试释进行镦粗劳进行光塑性分梗，壹双地嚣现了察漏的随舍形态，并璐察到横截颡切片的童洞周围的裘纹分礤区域纷必翔豹({--3)嵇艇分布不均；猩子午面切

3、片的空演蔼围黪密粜条缓形成类议玫璩楚线形状。这些变形形态与数德模拟一致。以聚碳黢酯为材料的三缨数值模拟络果也得鄹了物理模拟静验{磁。鼹释模拟礤究狸结合方法有力她播进对这～问题地深入研究。关键词：三维空洞闭合数值模拟物理模拟比对4SIMULAT工ONSTUDYONVOIDCLOSINGDURING3-DDEFORMATION鑫嚣S零袋轰0零Inthispapernumericalsimulationandphysicalsimulationwereusedconjointlytostudytheprocessofvoi

4、dclosureiningotduringhotupsetting．Theresultsofstudydeepenedunderstandingofthecomplicatedproblemandthereiscertainreferencevaluebymakinguseofreasonableprocessestoeliminatevoiddefectsiningot．3固finiteelementmethodfor1argedeformationisappliedinnumericalsimulationtoi

5、nvestigatetheprocessofhotupsettingonabout50casesofsteelcylinderingotswithsingleormultiplevoidswhicharedifferentindimensionorlocation。Uponthenumericalresults，duringclosureprocesstheshapeofthevoidsarepeiiet—’ellipse“。apertureinturnandatlastthevoidsclosed．Theratio

6、ofcompressingoneytinderingotswithvoidwhichisclosetooutersurfaceislargerthanthatwhichisremoved．Strainandstresscentralizedinstinctlyaroundthevoidsandingeneraltheshapeofcentralizedareapresentanalogousrosecurve．Thepartofanalogousrosecurvewhichisclosedtothecenterofc

7、ylinderistargerthantheanotherpartifthevoidincylinderisnotinmiddlepartofcylinder．Whenmorethanonevoidsareincylinder(twovoidsforinstance)，theareaofconcerfrationaroundthebigoneislargerthanthesmallone。Duringhotcompressingthere瑟ecloseareaofstrainand5stressinf【liddlep

8、artofcylinderwithtwosamedimensionvoidsinitonthewhole。Anartificalmethodofproducingsuccessivemodelwithvoidfromgrainmaterialsofpolycarbonate(PC)throughcontrollingtheheattempera