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Composites Essay

  • Submitted by: cykongll7
  • on April 26, 2012
  • Category: Psychology
  • Length: 8,768 words

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Below is an essay on "Composites" from Anti Essays, your source for research papers, essays, and term paper examples.

Chapter 16 – Composites
A composite is a multiphase material that exhibits a significant proportion of the properties of both constituent phases such that a better combination of properties is realized (principle of combined action)
- Composites maintain an interface between components to provide tailored properties not obtainable by one of the original components acting alone
- The primary needs for all the advanced composites are: light weight, higher operating temperatures, greater stiffness, higher reliability and affordability
Introduction – Definition   Two phase composite:
Matrix is the continuous phase and surrounds the other phase
Reinforcement is the dispersed phase, which normally bears the majority of stress
Classification of composites
- Particle reinforced: large, dispersion strengthened
- Fibre reinforced: continuous, discontinuous (short)
- Structural: laminates, sandwich panel
The particulate phase is harder and stiffer than the matrix material
The particles are of macroscopic scale, and restrain the movement of matrix, which transfer the applied load to the particles
The improvement of mechanical behaviour depends on the interface bonding Examples:
- Cermets (WC or TiC reinforced cobalt or nickel)
- Concrete(aggregate-gravel and sand-reinforced cement)
- SiC or Al2O3 particle reinforced Al matrix.
The particles are very small, 0.01 to 0.1 mm in diameter
The strengthening mechanisms occur on atomic or molecular scale
The matrix bears the major portion of the load
The particles hinder the motion of dislocations and thus the plastic deformation: e.g. precipitation hardening in 2014 Al-Cu alloys |
Elastic Behavior-Longitudinal Loading
When load is applied along the longitudinal
Fc = Fm + Ff
σc Ac= σm Am + σf Af
σc= σm Am/Ac + σf Af/Ac= σm Vm + σf Vf
εc = εm= εf   (for an isostrain state)
σc/εc= σm/εm Vm + σf/εf Vf
Ecl = EmVm + EfVf = Em(1 - Vf) + EfVf

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