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TECHNICAL PAPERS

Redesign of NEMO-Type Spherical Acrylic Submersible for Manned Operation to 3000 ft (914 m) Ocean Depth

[+] Author and Article Information
Partha S. Das

Harbor Branch Oceanographic Institution Inc., Fort Pierce, FL 34946e-mail: dasps100@hotmail.com

J. Pressure Vessel Technol 124(1), 97-107 (Aug 02, 2001) (11 pages) doi:10.1115/1.1428746 History: Received July 07, 2000; Revised August 02, 2001
Copyright © 2002 by ASME
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References

Figures

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A sectional view of HBOI’s acrylic spherical submersible
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A discretized FEA model for HBOI’s acrylic submersible with external loading and boundary conditions, including material properties
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Radial, hoop, and longitudinal stress distributions through the wall of HBOI’s acrylic submersible at Y=0, including Lamé solution for 3000 ft (914 m) depth
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Distribution of different stresses at acrylic/nylon interface through the wall of the HBOI’s acrylic submersible at 3000 ft (914 m) depth—(a) normal, principal, and equivalent stresses, (b) shear stress
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Variation of radial displacement of acrylic hull and nylon gasket at the acrylic/nylon interface and of the nylon gasket and aluminum hatch ring at the gasket/hatch ring interface through the wall of HBOI’s acrylic submersible for 3000 ft (914 m) depth
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Variation of maximum S3 in acrylic at the acrylic/nylon interface with different gasket thickness and shape
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Sectional view of HBOI’s acrylic submersible with various parameters for design of hatch/hatch ring
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Variation in shape of nylon hatch/hatch ring for acrylic submersible—(a) plane nylon hatch, (b) curved nylon hatch
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Sectional view of HBOI’s bottom of acrylic submersible with different parameters for plug design
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(a) Distribution of different stresses (normal, principal, and equivalent) at acrylic/nylon interface through the wall of the new acrylic submersible for 3000 ft (914 m) depth. (b) Variation of radial displacement of acrylic hull and nylon gasket at the acrylic/nylon interface and of the nylon gasket and aluminum hatch ring at the gasket/hatch ring interface through the wall of the new acrylic submersible for 3000 ft (914.4 m) depth.
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A sectional view of HBOI’s new acrylic submersible
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Strain gage locations in HBOI’s new acrylic submersible—(a) top hatch assembly, (b) acrylic sphere, (c) bottom plug assembly
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Variation of strains (longitudinal and hoop) through the acrylic sphere at inside surface at operational depth of 3000 ft (914 m)
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Normalized relative radial displacements of top nylon gasket and acrylic sphere with respect to aluminum hatch assembly during proof tests—(a) first test, (b) second test

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