简介:在现在的学习,我们模仿了用有限元素方法和建议multiaxial的链状的起床人(SCR)使疲劳的深海的钢的卷躺安装过程为卷的SCR的分析。卷躺方法是最有效、节俭的管道安装方法之一。然而,卷的起床人的材料性质可以变化,特别在焊接地区,它能影响疲劳表演。适用的有限元素分析(FEA),我们通过卷,aligner,和straightener模仿了安装负担历史并且分析了性质变化。焊接的影响在安装过程,穿入的缺乏和熔化的缺乏期间背叛,也被讨论。基于FEA结果,我们使用了与批评飞机途径相结合预言疲劳生活的棕色厂主的标准卷并且非卷的模型。结果显示一个焊接缺点在一个起床人,和卷躺方法的材料性质上有重要影响能显著地减少SCR的疲劳生活。分析结论能帮助设计者理解焊接的机械表演在期间卷躺安装。
简介:Supportvectormachines(SVM)receivedwideattentionforitsexcellentabilitytolearn,ithasbeenappliedinmanyfields.AreviewoftheapplicationofSVMinwelddefectdetectionandrecognitionofX-rayimageisbeenpresented.WewillshowsomecommonlyusedmethodsofwelddefectdetectionandrecognitionusingSVM,andtheadvantagesanddisadvantagesofeachmethodwillbediscussed.SVMappearstobepromisinginwelddefectdetectionandrecognition,butfutureresearchisneededbeforeitfullymatureinthisfiled.
简介:Themicrostructuresandprecipitatesinbasemetalsandheataffectedzones(HAZs)oftwoZr-Bmicroalloyedsteelswerecharacterizedbymeansofopticalmicroscopy(OM),transmissionelectronmicroscopy(TEM)andenergydispersivespectrum(EDS).Ithasbeenfoundthatprecipitatesoftensofnanometersinsizearepresentinthebasemetalsofbothsteels.Theaverageparticlesize,however,intheZr-BsteelwithTiislargerthanthatinthesteelwithoutTi.Afterthermalsimulations,inbothcases,theMnSsulfidescannucleateoncubic(Nb,Ti)(C,N)carbonitridesandnearlysphericalZr-bearingcompounds.TheprecipitatesintheHAZsofbothsteelsarecoarserthanthoseinthebasemetals,intherangesof150-200nmand50-100nmforTiaddedandTi-freesteels,respectively.