中南大学学术交流英语presentation

Epoxy Resins Matrix
Epoxy Resins ：环氧树脂
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Steel Pipe
Hub
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PART PROCESS
FOUR
PROCESSES FOR FIBER-REINFORCED-PLASTIC COMPOSITE MATERIALS
• OPEN-MOLD
• CLOSE-MOLD
Distinctly visible constituents Ferrite and pearlite
ຫໍສະໝຸດ Baidu
Distinctly recognized Glass fiber
A 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 other.
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Hand lay-up（手铺成形） process
• The simplest method • Applications
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Spray lay-up（喷射铺展） process
Carbon Fiber
• Similar to the hand The fiber contribute the high tensile properties for
Atomic level
Metal Alloys Polymeric materials
Microstructural level
Plain-Carbon steel
Macrostructural level
Glass-fiber-reinforced plastic
Different and distinct atomic groupings
aerospace
marine
automotive
other industrial applications
aramid
：芳纶
aromatic polyamide ：聚芳酰胺
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Three main types of synthetic fibers
carbon fiber
size
7 to 10μm
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.
Properties: low fracture toughness values , considerable fracture strengths applications： automobile and aircraft gas turbine engines, cutting tool ……
Composite Material
2016.9.29
Questions:
1. How to get high-stiffness carbon fibers? 2. What are the main matrix materials? 3. How many kinds of processes for fiber-
properties precursors
light weight,high strength,high stiffness
polyacrylonitrile(PAN),pitch
weakness
expensive
polyacrylonitrile：聚丙烯腈
spitch
：树脂
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Three main types of synthetic fibers
carbon fiber
PAN fibers
Stabilization at 200-220°C
Carbonization at 1000-1500°C
Graphitization at 1800°C
high-strength CF
high-stiffness
comparison among the three types
reinforced-plastic composite materials?
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Glass fiber; Carbon fiber; reinforced resins(树脂);American light wood 13
Supercar
Extensive application of carbon fiber composite materials in bodywork(车身） 14
Graphitization：石墨化 stiffness ：硬度
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PART Matrix THREE Materials
Functions
01 binds the fibers together and acts as the medium
02
protects the individual fibers from surface damage
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Carbon-Fiber-Reinforced-Epoxy Resins
Carbon Fiber
The fiber contribute the high tensile properties for rigidity and strength
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.
most widely used lowest in cost favorable characteristics
看完了关于如何做 high strength-to-weight ratio
科学研究的几本书 good dimensional stabi，lity只是觉得像喝了
good resistance to heat几,co碗ld鸡an汤d，然并卵
02 METAL–MATRIX
properties： higher operating temperatures and resistance, expensive applications： automobile manufacturers , turbine engines ……
03 CERAMIC–MATRIX
The application of composite materials in the field of architecture
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PART TWO
reinforcement Materials
Three main types of synthetic fibers
glass fiber
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Composite material application in industrial design
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High thrust fan jet
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B-2 stealth bomber(隐形轰炸机）
Major structure is Titanium (钛)composites , other structure is carbon fiber and graphite, hard to reflect
corrosion（腐蚀）
罢了
ease of fabrication
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Three main types of synthetic fibers
aramid fiber
generic name for aromatic polyamide fibers
Kevlar 29
Kevlar 49:low-density,high-strength
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目录
CONTENTS
0 1
Introduction
0 Reinforcement
2
Materials
0
Matrix Materials
3
0
Process
serves as a barrier to crack propagation
03
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Classification
01 POLYMER–MATRIX
properties：large quantities, low cost, ease of fabrication applications：boat hulls,building panels,structural panels for automobiles,aircraft……
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Introduction
Composite Something made up of distinct parts(or constituents)
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Lightweight carbon/carbon composites
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The 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.
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Today, composite materials used on the commercial plane account for only 50% of the weight of the machine, and some helicopters had reached 90%
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Military jeep made of composite materials