Abstract
We describe our study conducted within the framework of the design of composite mirrors for use in future generation astronomical telescopes. The work is also relevant to applications requiring lightweight optics and other unidirectional-ply fibre-composite-polymer constructs that require improved accuracy of form. Misalignment of layers (plies) in a composite laminate gives an astigmatic type deformation of the surface after cure. The influence of ply misalignment on surface form has been investigated via a series of finite element analyses. Thirty-two different layup sequences have been investigated: the angular increment between each ply, the number of plies and the number of sequence repeats were varied. Samples with random alignment errors have been simulated in order to compare the robustness of these different layup sequences toward ply misalignment; some design recommendations have been made. The finite element modelling method and results are presented here.
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