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Naval Applications of Composites Marine Composites Advanced Material Transporter (AMT) A recent Navy project that encompasses the total design and fabrication of a composite hull structure is the Advanced Material Transporter (AMT), where a 0.35 scale model was built. The material selected for the AMT was an E-glass woven roving fabric and vinyl ester resin. Seemann Composites lnc. was contracted to fabricate the entire ship hull and secondary structures of the AMT model using thVeacuum Assisted Resin Transfer Molding (VARTM) process. A modular construction approach was used to fabricate large components of the AMT, which were later assembled using a combination of bolting and bonding. The fabric reinforcement for the primary hull was laid up dry for the full thickness of the hull, and the resin was injected in one stage in only three and a half hours. The hull was cured at room temperature overnight and then longitudinal hat-stiffeners were fabricated in-place onto the boat hull. The 40-ft long cargo deck was fabricated using a 0.5-in. thick balsa core sandwich construction, and then room temperature cured overnight. Deep longitudinal hat-stiffener girders were fabricated in-place onto the deck bottom, similar to the girders on the ship hull. The bulkheads and superstructure were built using the same general approach as the main deck. Some of the critical joints for the main deck and bulkheads to the hull were completed using VARTM and other less critical connections were fabricated using hand lay-up. To reduce the time required for post curing, the entire boat hull was fully assembled and then post cured at an elevated temperature of 1 2F0for eight hours. The estimated structural weight for the model is 7000-lbs, which is 30% lighter than an aluminum hull concept. [1-36] Sandwich Wing Walls Figure 1-33 Lay-up Configuration for AMT Validation Model [Nguyen, 93 Sml Boat] Figure 1-34 Profile of AMT Vali- dation Model [Nguyen, 93 Sml Boat] Figure 1-35 Midships FEM of AMT Validation Model [Nguyen, 93 Sml Boat] 7.5 lb balsa Sandwich Deck 9.5 lb balsa Stiffeners PVC Foam Filled Hull Solid GRP 38PDF Image | Marine Componsites
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