Design and fabrication of submerged cylindrical laminates—I

This is the _rst of a two!part paper concerned with both structural and fabrication process design of a closed!end laminated composite cylinder intended for service in deep sea environment[ The cylinder is made of many di}erent orthotropic layers and is loaded by uniform\ axisymmetric surface tractions[ In additionpiecewise uniform eigenstrains and residual stresses may be caused in the layers during fabrication\ by _ber prestress for waviness reduction and by piecewise uniform changes in temperature[ The overall goal is to assure e.cient use of the composite structure under a prescribed hydrostatic pressure\ and to select _ber prestress distribution such that the total stresses in the plies do not exceed certain strength magnitudes[ Mechanical and residual stresses in the layers are evaluated with mechanical and transformation in~uence functions[ For the proportional loading applied by a hydrostatic pressure\ a procedure is outlined for design of several layups such that the cylinder wall experiences an isotropic in!plane strain and\ therefore\ all layers support the same compressive normal stresses\ regardless of _ber orientation[ The results are applied in design and analysis stress _elds in a speci_c structure[ Fabrication process design is discussed in the second part of the paper "Srinivas et al[\ 0888\ Int[ J[ Solids Structures\ 25\ 2834 2865#[