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ID:51013868
大小:9.53 MB
页数:58页
时间:2020-03-17
《英汉双语材料 力学 15.ppt》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、CHAPTER15FOUNDATIONSOFTHESTRESSANALYSISINEXPERIMENTSMechanicsofMaterials材料力学第十五章实验应力分析基础CHAPTER15FOUNDATIONSOFTHESTRESSANALYSISINEXPERIMENTS§15–1SUMMARY§15–2PRINCIPLEANDAPPLICATIONOFTHESTRAINOMETEROFTHERESISTANCE§15–3PRINCIPLEANDAPPLICATIONOFTHEPHOTOELASTICITY第十五章实验应力分析基础§15–1概述§15–
2、2电阻应变计法的原理及应用§15–3光弹性法的原理及应用§15–1Summary一、Functionofthestressanalysismethodinexperiments:1.Determinethereasonabledimensionandthestructurealformofamemberaccordingtothetestedstressorstrainofthemodelindesigning.2.Testthetruestressorstrainofamemberinworkandfindoutthepositionandthevalueo
3、fthemaximumstressinordertoevaluatethesaftyandreliabilityoftheengineeringstructureandtoprovidethebasisofimprovingworkingabilityfortheequipment.3.Analyzethedestroyedorfailedmemberandproposethemeasuresofimprovementinordertopreventitfromdestroyingagain.4.Testthemagnitude,derectionandall
4、kindsofdynamicresponsesoftheexternalload.5.Explorethenewrulefromtestsandcheckthetheoryofstressanalysisandthecalculationmethod.FOUNDATIONSOFTHESTRESSANALYSISINEXPERIMENTS§15–1概述一、实验应力分析方法的作用:1.设计时,测定模型的应力或变形,依此来确定构件的合理尺寸和结构形式。2.工作中,测定构件的真实应力或变形,找出最大应力的位置和数值,以评价工程结构的安全可靠性,并为提高设备的工作
5、能力提供依据。3.对破坏或失效构件进行分析,提出改进措施,防止再次破坏。4.测定外载的大小、方向以及各种动响应。5.从试验中探索新的规律,并对应力分析理论和计算方法进行校核。实验应力分析基础二、Briefintroductionofmethodsinthestressanalysisofexperiments1.Themachinerymeasuringmethod.ThefigureofmeasuringdeformationsinthebookannotatedbyZhengXuan(127-200)intheeastHandynasty.FOUNDAT
6、IONSOFTHESTRESSANALYSISINEXPERIMENTS二、实验应力分析方法简介:1.机械量测法东汉郑玄(127—200)注释的《考工记•弓人》中的测变形图实验应力分析基础LeonardoDaVinci(1452-1519).ThispictureisconsideredtoshowtheearliesttestinMechanicsofMaterials.ThetensiletestofanironwiredesignedbyLeonardoDaVinci.FOUNDATIONSOFTHESTRESSANALYSISINEXPERIM
7、ENTS里奥纳多•达•芬奇(1452—1519)此图被认为是最早的材力试验实验应力分析基础里奥纳多•达•芬奇设计的铁丝受拉试验tensileFOUNDATIONSOFTHESTRESSANALYSISINEXPERIMENTSGalileo(1564—1642)Fig.14SketchofthetensiletestofGalileoFig.15SketchofthebendingtestofGalileo伽利略(1564—1642)实验应力分析基础FOUNDATIONSOFTHESTRESSANALYSISINEXPERIMENTSFig.37Tensile
8、-testmachineofMushe
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