Life Prediction of Composite Pressure Vessels

Award Information
Agency:
Department of Defense
Branch
Army
Amount:
$729,160.00
Award Year:
2004
Program:
SBIR
Phase:
Phase II
Contract:
W31P4Q-05-C-R019
Award Id:
63079
Agency Tracking Number:
A022-2712
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
3620 Horizon Drive, King of Prussia, PA, 19406
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
877599274
Principal Investigator:
WilliamFlis
Director of Research
(610) 270-9700
flis@detk.com
Business Contact:
RobertCiccarelli
Vice President
(610) 270-9700
ciccar@detk.com
Research Institute:
n/a
Abstract
Stress-rupture life is a significant design issue for fiber reinforced composite pressure vessels subjected to long term pressurization. The considerable scatter in stress-rupture life exhibited by fiber reinforced composites, coupled with the lack of reliable life prediction methods, have led to the requirement for low operating pressures in relation to the design burst pressure. This leads to overly conservative designs and limited service life. Without a more reliable methodology for predicting stress-rupture life and proven accelerated test methods, a large number of tests over long periods of time are required. An improved approach for predicting the stress-rupture life of composite pressure vessels, based on actual fiber stress history, is needed. Under the proposed Phase II SBIR program, an improved methodology for predicting the stress-rupture life of filament wound composite pressure vessels based on actual fiber and matrix stress history is developed. The methodology includes an analytical model for predicting life based on the time-dependent behavior and failure mechanisms associated with fiber reinforced composites. The analytical model is supported by short-term and long-term testing of fiber properties, accelerated testing using time-temperature-stress superposition (TTSSP) as applied to dynamic mechanical analysis (DMA), and stress-rupture testing of composite pressure vessels.

* information listed above is at the time of submission.

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