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3.2 Laminate theory RoM formulae and models are useful for calculating the properties of single layers but more complex methodologies are required to enable characterisation of multi plied laminates. Laminate PlateTheory (LPT) is a complex but well established and ac- cepted approach. Whilst too complicated to describe in detail here LPT describes the deformation of a laminate under external loading based on the properties of the fibre, matrix and the % of each in each axis of loading. It is logical and easily automated for incorporation into engineering models. It is quite obvious that mechanical properties of a ply within the laminate are depend- ant on the alignment and orientation of the fibre within the ply. How the properties vary depends on the type of fibre. Carbon for example is more sensitive to loading direction than Aramid. Figure 10 shows how the primary mechanical properties, Youngs modulus, shear modulus and poisson’s ratio vary with ply angle: Figure 10 – Typical effect of ply angle on carbon laminate Further information on LPT can be found in any composite material textbook. A good initial text is: An introduction to composite materials Derek Hull and T.W Clyne Cambridge solid state series ISBN10 0521381908 ISBN13 9780521381901 12 - GTC-6-0417PDF Image | GUIDE TO COMPOSITES
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