基于光弹性贴片法材料表面应变场测量实验分析

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1、ABSTRACTElectricalmeasurement、Ⅳitllelectricresistancestraingaugeisoneofcommonlyusedmeasurememmethodsforsurfacestrain(stress)．Themeasudngmethodbasedonstrain-resistanceeffecthasadvantagesofhighsensitivityandsmallerror,however,itisakindofpoilltmeasurementmethodcallonlymeasurevery

2、smallareasofaveragestrainforthecomponentsurfaceandcallnotillustratethestrainfielddistributionofthemeasuredareas．Photoelasticcoatingmethodusingstrain-opticalinterferenceeffectofphotosensitivematerialtomeasurestrain(stress)ofcomponentsurface，itisakindofsurfacestrainfieldmeasurem

3、entmethoddevelopedbasedonthetraditionalphotoelasticmeasuringtechnique．Thephotoelasticcoatingmethodcanshowalargeareastrain(stress)fieldimageofcomponentsurface．Itcallshowalargeareastrain(stress)distributionandnotjusttheaveragestrainofasmallareavalue．Therefore，thestudyonthemeasur

4、ementofstraininphotoelasticeffectCanprovideavisualpattemmethodforregionalstrainfieldmeasurementofcomponentsurface．Themeasurementresultsofresistancestraingaugemethodisnoteasytointerpretdistributionofthesurfacestrainfield．Tosolvethisproblem，thearticlecardedoutthematerialsurfaces

5、trainmeasurementwithphotoelasticcoatings．Theresearchworkofphotoelasticproduction,materialcalibration，fringeimageprocessingandSOonarecarriedout．ToCalTyoutfurtherresearchwork,photoelasticcoatingsareappliedtometallicandconcretestrainfieldmeasurement．Themainresearchcontentsareasfo

6、lllows：(1)Productionprocessofphotoelasticcomingarestudied．Intheproductionprocessofphotoelasticcoating，someeffectivemeasuresareadoptedtosolveproplemsofthepatchinsidebubbles，uneventhickness，thesurfaceisnotsmoothetc．Thephotoelasticcoatingmaterialfringevaluewascalibratedwithunifor

7、mbeam，andstressenhancementeffectonthecalibrationresultsofthecoatingsWasrevised．(2)Throughtheloadingexperimentdofseveraltypicalphotoelasticshapes，themeaSurementandanalysismethodsofisochromatic，isocline，separationofprincipalstressaremastered．(3)Tomakethephotoelasticfringeclarity

8、andtobeunderstoodbetter,theimageprocessingtechniqueofphotoela