Quasi-Isotropic laminate Report Writing - Engineering Assignment Help

Assignment Task:

Task:

(a) Define the term 'Quasi-isotropic laminate'? 
(b) The stress — strain curves for most of the fibres used in polymer matrix composites show linear elastic behaviour to failure. Explain why in spite of this, composite structures do not usually fail catastrophically. 
(c) For the analysis of composite behaviour, why is it preferable to use the interactive failure criteria rather than the maximum stress or maximum strain criteria? 
(d) A unidirectional layer of continuous glass fibre reinforced composite material has a fibre volume fraction of 45%. The Young's modulus of the fibres is 75 GPa and of the matrix 4 GPa. Calculate the modulus of the composite (i.e. Ell = Ec). 
(e) 
A thin lamina of a composite with fibres aligned at 45° to the lamina major axis is subjected to the following stress system along its geometric axes. fQx [ad = ay I = 2 10l MPa rxy 3 Compute the stress components along the material axes. 
The following relationships may be useful: 

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