中南大学学术交流英语presentation演示教学.ppt

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1、中南大学学术交流英语中南大学学术交流英语presentationpresentation1.How to get high-stiffness carbon fibers?2.What are the main matrix materials?3.How many kinds of processes for fiber-reinforced-plastic composite materials?Questions:2PPT模板下载： 目录CONTENTSIntroduction01ReinforcementMaterials02MatrixMaterials03Process04PPT模

2、板下载： PARTONEIntroductionSomething made up of distinct parts(or constituents)CompositeAtomic levelMetal AlloysPolymeric materialsDifferent and distinct atomic groupingsMicrostructural levelPlain-Carbon steelDistinctly visible constituentsFerrite and pearlite Macrostructural levelGlass-fiber-reinforce

3、d plasticDistinctly recognizedGlass fiberA composite material :A materials system composed of a suitably arranged mixture or combination of two or more micro-or macroconstituents with an interface separating them,that differ in form and chemical composition and are essentially insoluble in each othe

4、r.The engineering importance:Two or more distinctly different materials combine to form a composite material that possesses properties that are superior to the properties of the individual components.6Composite material application in industrial design7High thrust fan jet8B-2 stealth bomber(隐形轰炸机）Ma

5、jor structure is Titanium(钛)composites,other structure is carbon fiber and graphite,hard to reflect9Lightweight carbon/carbon composites10The composite material fuselage(机身）:The price of light aircraft；Spacious cabin of the Medium-sized plane；The height of the cabin is 1.65 meters.11 Today,composite

6、 materials used on the commercial plane account for only 50%of the weight of the machine,and some helicopters had reached 90%12Military jeep made of composite materialsGlass fiber;Carbon fiber;reinforced resins(树脂);American light wood13SupercarExtensive application of carbon fiber composite material

7、s in bodywork(车身）14The application of composite materials in the field of architecture15PARTTWOreinforcement MaterialsThree main types of synthetic fibersglass fiberglass fiber看完了关于如何做科学研究的几本书，只是觉得像喝了几碗鸡汤，然并卵罢了most widely usedlowest in costfavorable characteristicshigh strength-to-weight ratiogood d

8、imensional stabilitygood resistance to heat,cold and corrosion（腐蚀）ease of fabrication17Three main types of synthetic fibersaramid fiberaramid fibergeneric name for aromatic polyamide fibersKevlar 29Kevlar 49:low-density,high-strengthaerospacemarineautomotiveother industrial applications aramid ：芳纶：芳

9、纶 aromatic polyamide ：聚芳酰胺18Three main types of synthetic fiberscarbon fibercarbon fibersize7 to 10mpropertieslight weight,high strength,high stiffnessprecursorspolyacrylonitrile(PAN),pitchweaknessexpensivepolyacrylonitrile：聚丙烯腈spitch ：树脂19Three main types of synthetic fiberscarbon fibercarbon fiber

10、PAN fibersStabilization at200-220CCarbonizationat 1000-1500CGraphitization at 1800Chigh-strength CFhigh-stiffnesscomparison among the three typescomparison among the three typesGraphitization：石墨化stiffness ：硬度20PARTTHREEMatrix MaterialsFunctions220301 binds the fibers together and acts as the medium

11、02 protects the individual fibers from surface damage serves as a barrier to crack propagationClassification230101POLYMERMATRIX properties：large quantities,low cost,ease of fabrication applications：boat hulls,building panels,structural panels for automobiles,aircraft0202METALMATRIX properties：higher

12、 operating temperatures and resistance,expensive applications：automobile manufacturers,turbine engines 0303CERAMICMATRIX Properties:low fracture toughness values,considerable fracture strengthsapplications：automobile and aircraft gas turbine engines,cutting tool Carbon-Fiber-Reinforced-Epoxy Resins

13、24Carbon Carbon FiberFiberThe fiber contribute the high tensile properties for rigidity and strengthEpoxy ResinsMatrix Epoxy resins are by far the most commonly used matrixes for carbon fibers.The matrix is the carrier for the alignment of the fiber and contributes some impact strength.Epoxy Resins：

14、环氧树脂 25HubSteel PipePARTFOURPROCESS27PROCESSES FOR FIBER-REINFORCED-PLASTIC COMPOSITE MATERIALSOPEN-MOLDCLOSE-MOLD28Hand lay-up（手铺成形）processThe simplest methodApplications29Carbon Carbon FiberFiberThe fiber contribute the high tensile properties for rigidity and strengthEpoxy resins are by far the m

15、ost commonly used matrixes for carbon fibers.The matrix is the carrier for the alignment of the fiber and contributes some impact strength.Spray lay-up（喷射铺展）processSimilar to the hand lay-up methodMultiple layersCuring temperature30Vacuum bag-autoclave（真空包热压）processCharacteristicApplicationsFilament

16、-winding（绕丝）processAnother important way to produce high-strength hollow cylindersApplications31Closed-Mold Processes for Fiber-Reinforced-Plastic Compostite Materials张贵钊纤维增强塑料的闭式模塑加工工艺0301Compression and Injection Molding02The Sheet-Molding Compound(SMC)ProcessContinuous-Pultrusion Process33Compres

17、sion and Injection Molding01Compression and Injection Moldingimpregnated with plasticwound around a rotating mandrel34Compression and Injection Molding02The Sheet-Molding Compound(SMC)ProcessContinuous-Pultrusion ProcessThe machine produces a sandwich of fiberglass and resin-filler paste between two thin-film sheets.35Compression and Injection Molding03Continuous-Pultrusion ProcessMicrograph of a cross section of an aluminum alloy-boron composite （magnification 40）36THANKS结束结束