CFRP蜂窝夹层结构板埋件集群区域的热应力失效模式分析及补强设计-豆柴文库

您所在位置：网站首页 / CFRP蜂窝夹层结构板埋件集群区域的热应力失效模式分析及补强设计.docx / 文档详情

在线预览结束，喜欢就下载吧，查找使用更方便

5 金币

下载文档

/ 2

下载提示

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

文本预览

CFRP蜂窝夹层结构板埋件集群区域的热应力失效模式分析及补强设计
Introduction
Theuseofcarbonfiberreinforcedpolymer(CFRP)compositeshasbeenincreasinginvariousindustries,includingaerospaceandautomotive,duetotheirhighstrength-to-weightratio,corrosionresistance,anddurability.However,whendesigningcompositestructures,itisimportanttoconsidertheeffectsofenvironmentalfactorssuchastemperature,whichcancausethermalstressesthatcanleadtofailure.
Inthispaper,wewillanalyzethethermalstressfailuremodeofaclusteredregionofembeddedcomponentsinaCFRPhoneycombsandwichstructureandprovideareinforcementdesigntoimproveitsperformance.
ThermalStressFailureAnalysis
Underthermalloading,thetemperaturedifferencebetweentheembeddedcomponentandthesurroundingCFRPlaminatecausesdifferentialthermalexpansion,resultinginthermalstressesthatcanexceedthematerial'sstrengthandcausefailure.Thefailuremodesincludematrixcracking,delamination,andfiberbreakage.
Todeterminethethermalstressdistributionandfailuremodes,finiteelementanalysis(FEA)wasperformedusingANSYSsoftware.ThemodelconsistedofaquarterofthesandwichstructurewithfourM5threadedinsertsembeddedinthehoneycombcore.
Thethermalloadwasappliedasauniformtemperatureincreaseof50°Ctothetopandbottomfacesofthelaminate.TheFEAresultsshowedthatthemaximumthermalstressoccurredinthevicinityoftheinsertsandconcentratedinthehoneycombcellsadjacenttotheinserts.
Thesimulationalsorevealedthatthehoneycombcoreexperiencedhighstrainlevelsduetothedifferentialthermalexpansion,whichcouldleadtocellwallbucklingandsubsequentcorecrushing,resultinginpermanentdeformation.
ReinforcementDesign
Toimprovethehoneycombsandwichstructure'sthermalstability,weproposedareinforcementdesignthatminimizesdifferentialthermalexpansionanddistributesthethermalloadmoreevenly.
Thereinforcementdesigninvolvesaddingathinlayerofcarbonfiberfabricbetweenthetoplaminateandthehoneycombcoretoincreasestiffnessandreducethedifferentialthermalexpansion.Thefabric'sorientationshouldbealignedwiththeprimaryloadingdirectiontomaximizeitseffect.
Thereinforcementdesignalso