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Pulltruded sections typically (and I say typically as some people have experimented with twisting the fibres to gain torsional strength) have all their fibres orientated along the length of the section, so can be strong in bending in (single and biaxial depending on the section) but dire in torsion and "normal" forces. With high pressure applications you need a variety of 0, 90, +/-45 UD to withstand the internal pressures. There is a book by "Swanson" that if I remember correctly has worked examples of how to design the member for the forces.
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