Composite at Karlsruher Institut für Technologie

Flashcards and summaries for Composite at the Karlsruher Institut für Technologie

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Categorization of Fibers: Criterias

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Main fiber orientation categories

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Definition Undirectional (UD) Fabric

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Exemplary flashcards for Composite at the Karlsruher Institut für Technologie on StudySmarter:

Woven fabric

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Thermoplasts: Thermal Properties

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Resin Stages

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Definition Interface

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Function of Interface

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Interface modifications

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risk of sizing

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Fiber/Matrix Interface: Characterization

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Definition Fabric

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Exemplary flashcards for Composite at the Karlsruher Institut für Technologie on StudySmarter:

Composite

Categorization of Fibers: Criterias

  • Orientation of used fibers
  • Construction methods to hold fibers together

Composite

Main fiber orientation categories

  • Unidirectional
  • Woven
  • Multiaxial
  • Random

Composite

Definition Undirectional (UD) Fabric

  • Majority of fibers run in one direction
  • Small amount in other direction
    • hold primary fibers in position

Composite

Woven fabric

  • Interlacing of warp fibers (0°) and werft (90°) fibers
  • Integrity maintained by interlocking of fibers
  • Used when more than one fiber direction is required

Composite

Thermoplasts: Thermal Properties

Standard:

  • Cheapest
  • Most common
  • 65-70 °C

Engineering:

  • 120-130 °C

Advanced Engineering:

  • 230-240°C

Imidized Plastics:

  • up to 430°C

Composite

Resin Stages

  • A-stage --> unreacted resin
  • B-stage --> vitrified system below gel point
  • C-stage --> completely cured resin

Composite

Definition Interface

Entire shared surface between fiber and matrix

Composite

Function of Interface

Bond between matrix and fiber dictates whether the fiber will improve the properties of the matrix when load is applied to the fiber

Composite

Interface modifications

  • change the surface
    • coating for more interaction
    • increase surface area
  • change the matrix
    • more interaction
  • do both

Composite

risk of sizing

can make the interface region brittle 

--> faster failure

Composite

Fiber/Matrix Interface: Characterization

  • Direct Methods
    • Single Fiber Pull-Out
    • Single Fiber Fragmentation
    • Single Fiber Compression
  • Indirect Methods
    • Variable Curvature
    • Slice Compression
    • Ball Compression
  • Composite Lamina Methods
    • 90° Flexual Strength
    • 90° Transverse Strength
    • 3 Point Shear

Composite

Definition Fabric

  • manufactured assembly of long fibers of carbon, aramid or glass, or a combination of these, to produce a flat sheet of one or more layers of fibers
  • These layers are held together either by mechanical interlocking of the fibers themselves or with a secondary material to bind these fibers together

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