History of Composite Materials
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What is a characteristic of dispersion-strengthened composites?

  • They are primarily used in cutting tools.
  • They contain coarse particles like tungsten carbide.
  • They rely solely on a soft matrix.
  • They improve properties at the atomic level. (correct)

What materials were used by the Egyptians for death masks around 2181–2055 B.C.?

  • Natural resins and fiber.
  • Straw and mud.
  • Wood and metal.
  • Linen and papyrus soaked in plaster. (correct)

Which type of fiber reinforcement allows for customized mechanical properties?

  • Randomly oriented fibers with high strength.
  • Continuous fibers oriented uniformly. (correct)
  • Discontinuous fibers with random orientation.
  • Short fibers embedded in a rigid matrix.

Which of the following is a product of ancient advancements in composites?

<p>Plywood using glued wood strips. (A)</p> Signup and view all the answers

What defines discontinuous fibers in fiber-reinforced composites?

<p>They provide uniform properties but have lower peak strength. (C)</p> Signup and view all the answers

What innovation did the Mongols introduce around 1200 A.D.?

<p>Bows made of wood, bamboo, and silk. (B)</p> Signup and view all the answers

What is a major characteristic of fiber-reinforced composites?

<p>They incorporate strong, stiff fibers into a ductile matrix. (C)</p> Signup and view all the answers

What is the main purpose of coating fibers with sizing during glass fiber production?

<p>To improve adhesion with resin (C)</p> Signup and view all the answers

How did the use of synthetic resins in the 1800s impact composite materials?

<p>They enabled the production of lightweight composites. (A)</p> Signup and view all the answers

Which of the following ingredients is NOT used in the mixing process for linoleum production?

<p>Glass fibers (C)</p> Signup and view all the answers

What occurs during the curing process of resin in glass fiber production?

<p>The resin solidifies to form a bond (A)</p> Signup and view all the answers

In the hand lay-up process, what happens after the layers of fiber are applied?

<p>Resin is manually added (D)</p> Signup and view all the answers

What is a common application for fiber cement?

<p>Residential and healthcare flooring (C)</p> Signup and view all the answers

What are the properties of concrete that make it suitable for roofing and exterior cladding?

<p>Durable, fire-resistant, and weatherproof (A)</p> Signup and view all the answers

What happens to linseed oil during its processing for linoleum manufacturing?

<p>It is oxidized to form linoleum cement (A)</p> Signup and view all the answers

What advantage does the spray-up process have over hand lay-up?

<p>It allows for faster production (C)</p> Signup and view all the answers

Which properties make plywood a versatile material?

<p>Resistant to splitting, versatile, and strong (C)</p> Signup and view all the answers

Which characteristic makes the final products of glass fiber production suitable for boat hulls?

<p>Their strength and lightweight nature (A)</p> Signup and view all the answers

What process is involved in creating fiber cement sheets?

<p>Pouring a slurry into molds and curing it (A)</p> Signup and view all the answers

What is the first step in the plywood manufacturing process?

<p>Log preparation involving soaking or steaming (B)</p> Signup and view all the answers

What is a significant step in the final production of fiber cement sheets?

<p>Cutting and finishing sheets for specific applications (B)</p> Signup and view all the answers

What gives concrete its high compressive strength?

<p>Its mixture with various aggregates (B)</p> Signup and view all the answers

Which type of fiber cement product is designed to imitate natural materials?

<p>Textured Fiber Cement (A)</p> Signup and view all the answers

What is the primary purpose of curing in the fiber cement sheet production process?

<p>To harden and strengthen the sheets (C)</p> Signup and view all the answers

What is the main purpose of the matrix phase in composite materials?

<p>Binds and transfers loads, providing structural integrity. (C)</p> Signup and view all the answers

What is the main purpose of adding reinforcement materials like steel rebar in composite manufacturing?

<p>To increase tensile strength (B)</p> Signup and view all the answers

Which composite manufacturing process involves pouring concrete into specific molds?

<p>Casting (C)</p> Signup and view all the answers

Which type of composite is characterized by layers of materials cemented together?

<p>Laminates. (A)</p> Signup and view all the answers

What defines hybrid composites?

<p>Combinations of different types of fibers for enhanced performance. (C)</p> Signup and view all the answers

What is the key difference between precast concrete and cast-in-place concrete?

<p>Precast concrete is produced in a factory before transportation (B)</p> Signup and view all the answers

Which characteristic of fiberglass makes it suitable for applications like boats and automotive parts?

<p>High strength-to-weight ratio (A)</p> Signup and view all the answers

Which of the following is a key feature of sandwich structures?

<p>Incorporates thin layers joined to lightweight cores. (B)</p> Signup and view all the answers

What type of reinforcement is found in particle-reinforced composites?

<p>A dispersion of particles that provides improved ductility. (D)</p> Signup and view all the answers

What is the primary composition of linoleum in composite material?

<p>Cork dust and linseed oil (B)</p> Signup and view all the answers

During which stage of composite material manufacturing does the material gain strength over time?

<p>Curing (D)</p> Signup and view all the answers

What is one advantage of incorporating sustainable materials in composites?

<p>Reduces environmental impact through renewable resources. (A)</p> Signup and view all the answers

Which application is commonly associated with practical composite systems?

<p>Automotive panels and packaging solutions. (B)</p> Signup and view all the answers

Which of the following is NOT typically a final product of composite materials in construction?

<p>Cement bags (B)</p> Signup and view all the answers

What aspect of fiberglass makes it advantageous for insulation applications?

<p>Low thermal conductivity (B)</p> Signup and view all the answers

What characteristic makes fiber-reinforced composites widely used?

<p>The ease of availability and economical production. (A)</p> Signup and view all the answers

Flashcards

Composite Materials

Materials made from two or more different materials combined to achieve specific properties.

Matrix Phase

The continuous phase in a composite that holds the reinforcing material.

Reinforcing Phase

The phase in a composite that provides strength and rigidity.

Particle-Reinforced Composites

Composite materials reinforced with small particles.

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Fiber-Reinforced Composites

Composite materials reinforced with fibers.

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Laminar Composites

Composites made of layers of materials stuck together.

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Sandwich Structures

Composites with thin layers on either side of a lightweight core.

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Practical Composite Systems

Composite materials used in industrial, structural, and consumer products.

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Particulate Composites

Composites containing coarse particles mixed with a matrix material for improved properties, such as hardness.

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Dispersion-Strengthened Composites

Composites with very small particles evenly distributed within a matrix. These small particles enhance properties at an atomic level.

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Continuous Fibers

Long, consistently oriented fibers in a composite, allowing for extremely customized and high strength in specific directions.

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Discontinuous Fibers

Short fibers in a composite, often aligned or randomly arranged, creating uniform properties, but with lower peak strength.

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Matrix Material

The material that surrounds and supports the fibers or particles in a composite.

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Plywood

A composite material made by gluing wood strips at different angles for added strength

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Composite Material Manufacturing

Different methods exist for creating composite materials, including open molding, closed molding, and cast polymer molding, chosen based on the materials, design, and final application.

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Fiberglass Composition

Fiberglass is made of glass fibers within a resin.

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Fiberglass Properties

High strength-to-weight ratio, corrosion resistance, and insulation are key characteristics of fiberglass.

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Linoleum Composition

Linoleum consists of linseed oil, wood flour, cork dust, and pigments.

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Precast Concrete

Concrete poured and cured in a factory, then transported to the construction site.

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Cast-in-Place Concrete

Concrete poured directly at the construction site.

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Concrete Reinforcement

Steel rebar or fibers may be added to concrete to increase tensile strength.

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Concrete Pouring and Shaping

Concrete is poured into molds or forms to achieve the desired shape.

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Glass Fiber Production

Involves melting glass at high temperatures and extruding it into thin fibers.

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Fiber Coating

Treating fibers with a coating (sizing) to improve adhesion with resin.

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Laying Up and Molding

Laying fibers in molds and combining them with resin to create the desired shape.

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Curing

Solidifying the shape by applying heat or a chemical catalyst to the resin.

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Hand Lay-Up

Manually applying layers of fiber and resin to create a structure.

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Spray-Up

Spraying chopped fibers and resin together to create a structure, providing faster production.

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Linoleum Cement

Thick, sticky material formed by oxidizing linseed oil, making it durable for flooring.

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Fiber Cement Composition

Made from cement and cellulose fibers, providing strength and durability.

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Concrete: What's it made of?

Concrete is a mixture of cement, sand, aggregates (like gravel), and water.

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Concrete: How's it strong?

Concrete gets its strength from the chemical reaction between cement and water, which hardens the mixture.

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Fiber Cement: What's special about it?

Fiber cement is a type of concrete that includes cellulose fibers, making it tougher, more resistant to cracking, and lighter.

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Plywood: How is it made?

Plywood is made by gluing thin layers of wood veneer together with alternating grain directions.

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What makes plywood strong?

The alternating grain in plywood makes it very strong and resistant to splitting.

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Concrete: What are its common uses?

Concrete is used for buildings, bridges, roads, and other structures because of its durability and strength.

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Fiber Cement: What are its uses?

Fiber cement is often used for roofing, exterior cladding, and other applications where weather resistance is important.

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Plywood: What are its uses?

Plywood's versatility makes it great for furniture, walls, and even roofing.

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Study Notes

History and Classification of Composite Materials

  • Ancient Times: Mesopotamians (3400 B.C.) used glued wood strips for plywood; Egyptians (2181-2055 B.C.) used cartonnage for death masks; Egyptians and Mesopotamians used straw to reinforce mud bricks, pottery, and boats (1500 B.C.); Romans (25 B.C.) described cement in "The Ten Books on Architecture" similar to modern Portland cement; Mongols (1200 A.D.) built composite bows from wood, bamboo, tendons, silk.
  • 1800s-1950s: Synthetic resins like Bakelite emerged during the chemical revolution, advancing plastic and composite use in aerospace and other industries in the 1900s-1950s.
  • 1990s-Present: Composites became mainstream in construction, automotive, aerospace, and medical.

Particle-Reinforced Composites

  • Two types: particulate and dispersion strengthened.
  • Particulate: Coarse particles (e.g., tungsten carbide) embedded in metals for tools.
  • Dispersion-Strengthened: Fine particles that enhance metal properties at the atomic level (e.g., Thoria-dispersed nickel alloys).
  • Concrete and some metal matrix composites are included in this category.

Fiber-Reinforced Composites

  • Improved strength, strength-to-weight ratio via strong fibers (e.g., carbon fiber, fiberglass) in a less stiff matrix.
  • Fibers transfer load.
  • Classified as continuous fibers (oriented for specific properties) or discontinuous fibers (aligned/randomly oriented).

Types of Composites

  • Matrix Types: Ceramic, polymer, metal, thermoplastic, thermoset.
  • Reinforcement Types: Particle-reinforced (particulate/dispersion); Fiber-reinforced (continuous/discontinuous); Structural (laminate/sandwich).

Structural Composites

  • Laminar: Layers (metals/fibers) cemented for integrity.
  • Sandwich: Thin layers bonded to lightweight cores for rigidity and strength in aerospace and construction.

Practical Composite Systems

  • Enhance performance in industrial, structural, and consumer products (strength, durability, lightweight, corrosion resistance).
  • Sustainable focus: Using renewable fibers (flax), recyclable resins to reduce environmental impact (e.g., automotive panels, packaging).
  • Hybrid composites: Combining diverse materials (e.g., carbon and glass fibers) for added strength, durability, and flexibility (e.g., bicycles, body armor, aerospace).

Other Composite Material Examples (from subsequent pages)

  • Fiberglass: High strength-to-weight, corrosion resistant, insulation (boats, automotive, insulation).
  • Linoleum: Linseed oil, wood flour, cork, pigments. Durable, biodegradable, antimicrobial (floorings, healthcare).
  • Fiber Cement: Cement, sand, aggregates, and cellulose fibers. Strong, fire-resistant, weatherproof (roofing, exterior cladding).
  • Plywood: Thin wood veneers bonded with adhesive, resistant to splitting, versatile (furniture, walls, roofing).
  • Concrete: Cement, sand, aggregates, optionally with steel rebar. High compressive strength, durable (building materials).

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Composite Materials: History & Classification PDF

Description

Explore the fascinating evolution of composite materials from ancient civilizations like the Mesopotamians and Egyptians to modern applications in various industries. This quiz covers their historical uses, advancements in synthetic materials, and the emergence of particle-reinforced composites. Test your knowledge on how composites have transformed construction, automotive, aerospace, and medical fields.

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