HYDROSTATIC PRESSURE TESTS OF GLASS-REINFORCED-PLASTIC SANDWICH CYLINDERS WITH LIGHTWEIGHT FOAM CORE.
DAVID TAYLOR MODEL BASIN WASHINGTON D C STRUCTURAL MECHANICS LAB
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Six sandwich cylinders consisting of filament-wound, glass-reinforced-plastic GRP faces and a uniform core of syntactic foam were tested under external hydrostatic pressure to investigate stiffening systems for shear-sensitive materials. The cylinders were designed for a collapse depth of 12,000 to 40,000 feet. Maximum stress developed in the GRP facings prior to failure exceeded 150,000 psi. Stress levels of this magnitude have never been realized with ring-stiffened cylinders fabricated from glass reinforced plastics. Only a marginal increase in static-strength performance was realized because the syntactic foam was relatively heavy in comparison to its compressive strength. However, a higher cyclic performance might be realized.
- Marine Engineering
- Structural Engineering and Building Technology