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1、第52卷第17期機械工程學(xué)報Vol.52No.172016年9月JOURNALOFMECHANICALENGINEERINGSep.2016DOI：10.3901/JME.2016.17.168*熱預(yù)應(yīng)力自增強厚壁圓筒研究12朱瑞林朱國林(1.湖南師范大學(xué)工程與設(shè)計學(xué)院長沙410081；2.江西警察學(xué)院基礎(chǔ)課部南昌330103)摘要：厚壁圓筒自增強處理技術(shù)的關(guān)鍵在于預(yù)應(yīng)力。傳統(tǒng)的自增強處理技術(shù)采用的是機械預(yù)應(yīng)力方法，即在圓筒投入使用前，對其施加超過操作壓力的自增強壓力，使之獲得殘余預(yù)應(yīng)力?？紤]到厚壁圓筒內(nèi)、外壁存在溫差時，筒壁中有熱應(yīng)力產(chǎn)生，因此針對厚壁圓筒自增強問題，提出了以熱應(yīng)
2、力作為預(yù)應(yīng)力的自增強技術(shù)。具體研究了圓筒壁厚、溫差等對熱應(yīng)力與總應(yīng)力(熱應(yīng)力與操作應(yīng)力的疊加)的影響、熱應(yīng)力與總應(yīng)力的變化趨勢、各種參數(shù)間的約束條件；在分析熱應(yīng)力與總應(yīng)力特性的基礎(chǔ)上，得出最佳設(shè)計條件，提出了基于第四強度理論的熱預(yù)應(yīng)力自增強厚壁圓筒的設(shè)計方法。結(jié)果表明，熱預(yù)應(yīng)力能有效地降低和均化厚壁圓筒的操作應(yīng)力；按照所提出的設(shè)計方法，在確保圓筒安全的前提下，可使圓筒獲得最大的承載能力和最小的壁厚。關(guān)鍵詞：厚壁圓筒；自增強；預(yù)熱應(yīng)力；強度；總應(yīng)力中圖分類號：TH49StudyonAutofrettagedThick-walledCylinderswithThermalPre-str
3、esses12ZHURuilinZHUGuolin(1.CollegeofEngineeringandDesign,HunanNormalUniversity,Changsha410081;2.BasicCoursesDepartment,JiangxiPoliceCollege,Nanchang330103)Abstract：Thekeytoautofrettagetechnologyofthick-walledcylindersliesinpre-stresses.Intraditionalautofrettagetechnology,pre-stressesincylinde
4、rsareproducedbymechanicalactions,thatis,thecylindersaresubjectedtopressureshigherthanoperationpressuresforpre-stressestobeproducedbeforetheyareputintouse.Inconsiderationofthattherearethermalstressesinthewallofacylinderwhenthereistemperaturedifferencebetweentheinsideandoutsidesurfaces,forautofr
5、ettageofthick-walledcylinder,thetechnologyofautofrettagewiththermalpre-stressesisthusproposed.Theeffectsofthicknessandtemperaturedifferenceonthermalstressesandtotalstresses(thermalstressesplusoperationstresses)arestudied.Thevaryingtrendsofthermalstressesandtotalstressesareanalyzed.Thecondition
6、sofconstraintsonavarietyparametersareinvestigated.Onthebasisofanalyzingthecharacteristicsofthermalstressesandthetotalstresses,theoptimumdesignconditionsareobtained,andamethodologyfordesignofautofrettagedthick-walledcylinderswiththermalpre-stressesbasedonthefourthstrengththeoryispresented.Itiss
7、hownthatthethermalpre-stressescaneffectivelyreduceandeventheoperationstressesofathick-walledcylinder,andaccordingtothepresentedmethodologyfordesign,themaximumload-bearingcapacitiesandtheminimumthicknessesofcylinderscanbeobtainedunderthe
