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时间:2020-04-05
《多轴载荷对含埋藏椭圆裂纹平板极限载荷的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、多轴载荷对含埋藏椭圆裂纹平板极限载荷的影响吕原君,杨建国,雷月葆,高增梁2(1.浙江工业大学化工机械设计研究所,浙江杭州310032;2.过程装备及其再制造教育部工程研究中心,浙江杭州310032;3.浙江工业职业技术学院电气电子工程学院,浙江绍兴312000)摘要:极限载荷是含缺陷结构完整性评定的主要参量,极限载荷的计算是否正确十分重要。在多轴应力条件下,目前通用的评定计算中一般只考虑与裂纹面垂直方向的应力,忽略与裂纹面平行方向的载荷,,这可能会给极限载荷的计算带来误差。针对含中心埋藏椭圆裂纹的平
2、板,推导出在双轴拉/压载荷与单轴弯矩共同作用下的极限载荷解,并通过三维有限元计算结果进行了验证。探讨了多轴载荷对极限载荷的影响,当。为正时,若<0,忽视r厂会过高估计极限载荷;若≥0,当/or小于一特定值,忽视,会低估极限载荷,反之,忽视也会过高估计极限载荷。关键词:多轴载荷影响;中心埋藏椭圆裂纹;平板;极限载荷中图分类号:TH123;TB301文献标志码:A文章编号:lOOl一4837(2015)02—0040—08doi:10.3969/j.issn.1001—4837.2015.02.005I
3、nfluenceofMultiaxialLoadingonLimitLoadofPlateswithEmbeddedEllipticalCracksL0Yuan—jun,YANGJian—guo,LEIYue—bao一,GAOZeng—liang’(1.ZhejiangUniversityofTechnology,InstituteofProcessEquipmentandControlEngineering,Hangzhou310032,China;2.EngineeringResearchCen
4、terofProcessEquipmentandRe—manufacturing,MinistryofEducation,Hangzhou310032,China;3.ZhejiangIndustryPolytechnicCollege,SchoolofElectricalandE—lectronicEngineering,Shaoxing312000,China)Abstract:Limitloadisamajorparameterinintegrityassessmentofengineerin
5、gstructurescontainingde—fectsanditscalculationisveryimportantfortheintegrityassessment。Onlythestress盯1thatisperpendic—ulartothecrackplaneisconsideredrcalculatingthe1imitloadandJintegralofstructuresundermultiaxialloading,whilethestress2thatisparalleltot
6、hecrackplaneisignored.Itmayresultsinthedevia—tionofthelimitload.ThelimitloadexpressionsofplateswithcentralembeddedellipticalcracksundercombinedloadinghavebeendeducedbasedonMisesyieldcriterion.Theloadingaretensile/compressivestressindual—axisandbendingm
7、omentappliedatthecentroidoftheendsectionsoftheplate.Thede—ducedresu]tshavebeenvalidatedusing3Delasticplasticfiniteelementmethod(FEM).Theinfluenceofmultiaxialloadingonlimitloadisdiscussed.Whenthestress1ispositive,limitloadswillbeoverestima—tedignoring2f
8、orthecasewith2<0.Whilefortheeasewith2I>0,thelimitloadswillbeunderesti—matedwhen2/or】islessthanacertainvalue,andthelimitloadswillbeoverestimatedwhen,/or1is基金项目:『日家卜二“科技支撑计划项目(2011BAK06B03);浙江省公益类蘑点项日(2014C23001)·40·第32卷第2期压力容器第267期higher
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