Manufacturing Composite External Volumes with Enhanced Underwater Collapse Performance
Navy SBIR 2020.1 - Topic N201-026
NAVSEA - Mr. Dean Putnam - firstname.lastname@example.org
Opens: January 14, 2020 - Closes: February 12, 2020 (8:00 PM ET)
AREA(S): Ground/Sea Vehicles
PROGRAM: PMS 397, COLUMBIA Class Submarine Program Office.
technology within this topic is restricted under the International Traffic in
Arms Regulation (ITAR), 22 CFR Parts 120-130, which controls the export and
import of defense-related material and services, including export of sensitive
technical data, or the Export Administration Regulation (EAR), 15 CFR Parts
730-774, which controls dual use items. Offerors must disclose any proposed use
of foreign nationals (FNs), their country(ies) of origin, the type of visa or
work permit possessed, and the statement of work (SOW) tasks intended for
accomplishment by the FN(s) in accordance with section 3.5 of the Announcement.
Offerors are advised foreign nationals proposed to perform on this topic may be
restricted due to the technical data under US Export Control Laws.
Develop an ability to manufacture high-quality composite pressure housings for
external volumes (EVs) with an enhanced hydrostatic pressure collapse performance
by understanding how filament winding methods and materials can be used to
control the collapse response.
In order to adhere to Navy submergence requirements (MIL-STD-1688, MIL-STD-278,
or other relevant commercial standard), all components and systems must be
evaluated to assess their susceptibility to the underwater environment.
Components external to submarine pressure hulls, such as EVs, are particularly
difficult to evaluate due to the high potential for material flaws to cause catastrophic
collapse under hydrostatic pressure loading. The catastrophic collapse of EVs
can result in the release of a radiated pressure pulse that can negatively
affect nearby components and other EVs. Composite materials provide unique
characteristics and increased flexibility for application-specific
customization. The Navy has successfully leveraged the benefits of composite
materials for use as EV pressure housings, which are often used to isolate
components from exposure to the harsh marine environment. The Navy seeks an
enhanced understanding of how manufacturing methods affect material flaw
distributions and subsequent collapse failure of EV composite pressure housings
due to underwater hydrostatic pressure loading.
Investigate the effects filament winding methods, such as width of winding
strip and overlapping frequency, have on housing quality. Cylindrical glass
fiber reinforced composite pressure housings will be manufactured with a
diameter and length between 6 inches and 36 inches. Only one- or two-part
shapes (diameter and aspect ratio combinations) will be developed during Phase
I, while multiple winding methods will be investigated. Part flaws will be
quantified using non-destructive scanning methods (e.g., ultrasound) to measure
size, distribution, and location of flaws. Shape quality will be quantified
using techniques such as out-of-roundness and thickness measurements. Once
high-quality manufacturing methods are obtained, with minimal flaws and acceptable
shape measurements, a best practices and lessons learned guide to manufacture
composite pressure housings will be developed. The Phase I Option, if
exercised, will continue to investigate additional filament winding techniques
that may result in high-quality, low-cost parts.
Building on lessons learned during Phase I, determine the effects of
manufacturing composite housings with a variety of glass fiber types (e.g.,
E-glass, S-glass, S-2 glass, etc.). Quantify part and shape quality of the
housings. Facilitate Navy performed hydrostatic collapse testing of the
housings manufactured during Phase I to quantify how quality, winding method,
and glass fiber properties influences the housing collapse performance. Develop
a capability to manufacture flat filament wound material characterization
samples. Execute instrumented quasi-static and high-strain rate
characterization of the filament wound materials. Manufacture a variety of
parts from small-scale to large-scale with the previously identified best
manufacturing methods and materials, and collapse tested to provide evidence of
how scale effects quality and performance. Expand manufacturing capabilities to
EVs, which consist of other fiber types (e.g., carbon fiber) and hybrid designs
(e.g., composite wrapped metallic cylinders) to add to the manufacturer’s
ability to produce a wide range of Navy EVs.
DUAL USE APPLICATIONS: Assist the Navy in transitioning this technology to a
wide variety of other military and non-military undersea applications
including, but not limited to, oil and gas extraction, exploratory work for
deep-sea mining, and scientific exploration. These deep-sea activities are
continually becoming more common due to decreases in terrestrial resources and
improvements in marine technologies. As composite-housed components become more
prevalent across all fields, the ability to design and manufacture them for
increased safety by mitigating hydrostatic collapse is essential to continue
safe human exploration and operations in the harsh environment of the deep sea.
1. Pinto, M.,
Matos, H., Gupta, S. and Shukla, A. “Experimental Investigation on Underwater
Buckling of Thin-walled Composite and Metallic Structures.” Journal of Pressure
Vessel Technology, 2016, 138(6). doi: 10.1115/1.4032703.
2. Pinto, M.,
Gupta, S. and Shukla, A. “Hydrostatic Implosion of GFRP Composite Tubes Studied
by Digital Image Correlation.” Journal of Pressure Vessel Technology, 2015,
137(5). doi: 10.1115/1.4029657.
3. Leduc, M.
“On the implosion of underwater composite shells.” Master’s thesis, 2011, The
University of Texas at Austin. https://repositories.lib.utexas.edu/bitstream/handle/2152/ETD-UT-2011-12-4443/LEDUC-THESIS.pdf?sequence=1&isAllowed=y
External Volumes; EVs; Submarines; Composites; Hydrostatic Pressure Collapse;
Filament Wound Composite Shells