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1、應變強化后容器的外壓屈曲分析陳希，鄭津洋，繆存堅，高曉哲，惠培子，丁會明(1．浙江大學化工機械研究所浙江杭州310027；2．高壓過程裝備與安全教育部工程研究中心，浙江杭州310027；3．流體動力與機電系統(tǒng)國家重點實驗室，浙江杭州310027)摘要：在應變強化過程中，容器會發(fā)生塑性變形。為了解該變形對于容器外壓穩(wěn)定性的影響，確立了全面考慮強化影響的非線性屈曲分析方法，并選擇不圓度作為初始幾何缺陷，進行理想容器和含初始不圓度容器在強化前后的屈曲求解，通過比較屈曲載荷、屈曲模態(tài)以及載荷位移曲線的變化來探究應變強化過程對容器外壓穩(wěn)定性的影響規(guī)律。結果表明，建立的容器模型的屈曲載荷具有
2、很強的不圓度敏感性；含初始不圓度的容器強化后的屈曲載荷提高，外壓穩(wěn)定性增強；應變強化過程可改善容器圓度，提高容器制造過程中殼體初始不圓度的最大允許值。關鍵詞：應變強化；外壓穩(wěn)定性；不圓度；非線性屈曲中圖分類號：TH49；0343．5文獻標志碼：A文章編號：1001—4837(2015)08—0014—07doi：10．3969／j．issn．1001—4837．2015．08．003BucklingAnalysisofCold-stretchedVesselsunderExternalPressureCHENXi，ZHENGJin—yang’，MIAOCun—jian，GAOXi
3、ao—zhe，HUIPei—zi．DINGHui—ming(1．InstituteofProcessEquipment，ZhejiangUniversity，Hangzhou310027，China；2．EngineeringResearchCenterforHighPressureProcessEquipmentandSafety(MinistryofEducation)，Hangzhou310027，China；3．TheStateKeyLaboratoryofFluidPowerTransmissionandControl，Hangzhou310027，China)Abst
4、ract：Plasticdeformationoccurredwhenvesselswerecold．stretched．Inordertofigureouttheinflu．enceofthedeformationofcold-stretchingonstabilityofvesselsunderexternalpressure，thispaperestab．1ishedthenonlinearbucklinganalysismethodwhichcouldtakealltheinfluenceintoconsiderati0n．choseoutofroundnessasini
5、tialgeometricimperfectionformofvessels，andperformedthebucklinganalysesofperfectvesselsandvesselswithinitialout．of-roundnessbeforeandaftertheprocessofcold．stretchingto，analyzetheinfluencethattheprocessofcold-stretchingbroughttothestabilityofvesselsbycomparingthechangeofthebucklingload，thebuckl
6、ingmodeandtheload—displacementcurves．Theresultsshowthatthebucklingloadofvesselsestablishedinthispaperarestronglysensitivetoout—of．roundness．Thebuck．1ingloadofvesselswithout-of-roundnessincreasesaftercold．stretching．Consequentlythestabilityofyes．．selsunderexternalpressurealsoincreases．Furtherm
7、ore．theprocessofcold．stretchingcanimprovetheroundnessofthevesselsandincreasethemaximumallowablevalueofoutofroundnessduringtheprocessofproducingofmanufacturing．Keywords：cold—stretching；stabilityunderexternalpressure；out-of-roundness；nonlinearb
