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时间:2019-05-15
《TC4钛合金激光搭接冲击强化的实验和数值模拟》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、万方数据第34卷第5期2010年9月激光技术LASERTECHNOLOGYV01.34,No.5September,2010文章编号:1001-3806(2010)05—0632-04TC4钛合金激光搭接冲击强化的实验和数值模拟花银群1’2,蔡峥嵘3,陈瑞芳3,姜辉3,吉光1(1.江苏大学材料科学与工程学院,镇江212013;2.北京航空航天大学化学与环境学院,北京100083;3.江苏大学机械工程学院,镇江212013)摘要:为了研究激光搭接冲击时残余应力场的特征以及激光冲击参量对搭接区残余应力场的影响,采用高功率钕玻璃激光系统对TCA板进行了激光搭接冲击实验,同时利用有限元软件AN
2、SYS对激光搭接冲击过程进行了模拟,残余应力场的数值模拟结果与实验结果取得较好的一致。结果表明,在不考虑各冲击参量之间交互作用的前提下,搭接区表面残余压应力值和残余压应力场深度随搭接率增加而增加,但达到一定闽值后,残压应力场深度会下降;搭接区表面残余压应力值和残余应力场深度会随着功率密度的上升而增加;在脉宽小于一定阈值条件下,搭接区表面残余压应力随脉宽增加而增加,超过阀值之后,表面残余压应力减小,但残余压应力层深度一直是随着脉宽的增加而增加。关键词:激光技术;激光搭接冲击强化;数值模拟;残余应力场;TC4钛合金中图分类号:TN249;TG664文献标识码:Adoi:10.3969/j.
3、issn.1001-3806.2010.05.015ExperimentandnumericalsimulationofoverlappinglasershockprocessinginTC4titaniumalloyHUAYin—qunl”,CAIZheng—ron93,CHENRui-fan93,JIANGHui3,JlGuan91(1.SchoolofMaterialScience&Engineering,JiangsuUniversity,Zhenjiang212013,China;2.SchoolofChemistry&Environ—ment,BeijingUniversi
4、tyofAeronauticsandAstronautics,Beijing100083,China;3.SchoolofMechanicalEngineering,JiangsuUniversity,Zhenjiang212013,China)Abstract:Inordertostudythecharacteristicsoftheresidualstressfield,theeffectoflasershockparametersonresidualstressfieldinoverlappingarea,overlappinglasershockofTC4Titaniumall
5、oywascarriedoutwithhigh—powerQ—switched,pulsedneodymium—slasslaser.ThentheprocessofoverlappinglasershockwassimulatedwithANSYS.Thenumericalresultsshowedgoodagreementwiththeexperimentaldata.Withoutconsideringtheinteractionbetweentheshockparameters,increasingtheoverlappingrate,thelaserpowerdensitya
6、ndthelaserpulseduration,thesurfaceresidualcompressivestressandthedepthofresidualcompressivestressfieldinoverlappingzonecanbeincreased.However,iftheoverlappingrateandlaserpulsedurationexceedsathresholdvalue,thedepthofresidualcompressivestressfieldandthevalueofsurfaceresidualcompressivestressinove
7、rlappingzonedeclinerespectivelywiththeincreaseoftheoverlappingrateandthelaserpulseduration.Keywords:lasertechnique;overlappinglasershockprocessing;numericalsimulation;residualstressfield;TC4titaniumaUov引言激光冲击强化技术(1asershockp
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