Life Prediction of Composite Pressure Vessels

Award Information
Agency: Department of Defense
Branch: Army
Contract: W31P4Q-05-C-R019
Agency Tracking Number: A022-2712
Amount: $729,160.00
Phase: Phase II
Program: SBIR
Awards Year: 2004
Solicitation Year: 2003
Solicitation Topic Code: A02-162
Solicitation Number: 2003.2
Small Business Information
DE TECHNOLOGIES, INC.
3620 Horizon Drive, King of Prussia, PA, 19406
DUNS: 877599274
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: Y
Principal Investigator
 William Flis
 Director of Research
 (610) 270-9700
 flis@detk.com
Business Contact
 Robert Ciccarelli
Title: Vice President
Phone: (610) 270-9700
Email: ciccar@detk.com
Research Institution
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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