Repeat Problem but use the graphite/epoxy composite material listed in Table 2–13 in Chapt...

Repeat Problem but use the graphite/epoxy composite material listed in Table 2–13 in Chapter that has a tensile strength of 278 ksi. Check the final design by computing the design factor with respect to tensile strength against the maximum pressure of 900 psi. The tank will be lined with a thin polymeric shell and wrapped fully with the unidirectional composite in a circumferential pattern to resist the hoop stress in the cylinder. Neglect the contribution of the liner in the stress analysis and in the weight calculation. (Note that the cylindrical shell would also°likely require some plies of the composite to be placed in a helical fashion to resist the longitudinal stress and to permit the formation of the dome-shaped ends. Therefore, the final weight will be somewhat higher than computed for just the circumferentially wrapped part.)

Problem

Design a cylindrical pressure vessel to carry compressed air for a self-contained breathing apparatus for use by firefighters when operating in smoke-filled buildings. The minimum inside diameter is to be 6.00 in and the length of the cylindrical portion of the tank is to be 15.0 in. It must withstand a service pressure of 450 psi. Use a design stress of su/8 to account for a large number of pressurization cycles. Also, check the final design for its ability to withstand a maximum pressure of 900 psi by computing the design factor based on yield strength. The tank is to be made from aluminum alloy 6061-T6. Compute the weight of just the cylindrical portion.