SiCp／2024Al 复合材料微观结构建模及动态力学性能评估.pdf

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1、固体火箭技术第37卷第4期JournalofSolidRocketTechnologyVol_37No．42014Microstructure--basedmodelingandevaluationofdynamicbehaviorsofSiCp／2024A1composites①YUANMei—ni，，YANGYan—qing，GONGQiao-juan，LIChao．LANGXian—zhong．FANXue．1ing(1．CollegeofMechanicalandElectricalEngineering，NorthUniversityofChina，Tai

2、yuan030051，China；2．StateKeyLaboratoryofSolidificationProcessing，NorthwesternPolytechnicalUniversity，Xi'an710072，China；3．DepartmentofAppliedChemistry，YunchengUniversity，Yuncheng030024，China；4．StateKeyLaboratoryforStrengthandVibrationofMechanicalStructures，Xi"anJiaotongUniversity，Xi'an71

3、0049，China)Abstract：Usingtheinformationofimageprocessingandrecognition，amicrostructure—basedfiniteelementmodel(FEM)ises—tablishedtoevaluatethedynamicpropertiesofSiC。／2024A1compositesatstrainratesrangingfrom200to14000s～．Inthemicro。structure—basedmodel，theirregularSiCparticlesarerandomly

4、distributedinthemetalmatrix．TheresultsshowthattheflowstressofSiCp／2024A1compositeswithlowparticlevolumefractionincreasesfirstlytoamaximumvalueandthendecreaseswiththeincreas。ingofstrainrateduringadiabaticcompression．Theprobablereasonforthereductionofflowstressisthattheinnerdamageandtheh

5、eatsofteningofcompositesplayakeyroleinthedynamicbehaviorofSiC。／2024A1compositesathigherstrainrates．Moreover，theconfigurationsofSiCparticleshavedominateinfluenceonthedynamicalbehaviorofSiCp／2024A1composites．Inparticular，incasesofsmallerstrain(1essthan0．62)，theangularparticleshavebetters

6、trengtheningeffectthanthoseofcircleparticles，however，incontrast，thestrengtheningeffectofcircleparticlesismoreremarkable．Keywords：metalliccomposites；microstrncture；finiteelementmethod；dynamicbehaviorCLCNumber：V257DocumentCode：AArticleID：1006-2793(2014)04·0541-04DOI：10．7673／j．issn．1006．2

7、793．2014．04．021SiCp／2024A1复合材料微观结构建模及动态力学性能评估原梅妮，杨延清，弓巧娟，李超，郎贤忠，范学领(1．中北大学机电工程学院，太原030051；2．西北工业大学凝固技术国家重点实验室，西安710072；3．运城学院应用化学系，运城030024；4．西安交通大学强度与振动实验室，西安710049)摘要：借助图像处理和识别技术，建立复合材料真实微观结构的有限元模型，并运用该模型分析计算SiC。／2024A1复合材料在应变速率为200～14000s下的动态力学性能。在真实微观结构的有限元模型中，无规则的SiC颗粒自由分布在铝合金基体