Stress-rupture life of Kevlar/epoxy spherical pressure vessels

Technical Report · Fri Feb 23 00:00:00 EST 1979

OSTI ID:6293332

Barlow, R E; Toland, R H; Freeman, T

This study of stress rupture has two objectives: to generate baseline data on vessel life under pressure and to apply statistical reliability theory to vessel and strand data in order to predict reliability at given stress levels. The improved life prediction methods useful in the analysis of life data are described. These methods are applied to two sets of data, i.e., the extensive Kevlar/epoxy strand data and the current Kevlar/epoxy spherical pressure vessel data. Of principal importance is the observation that the hazard rates for both data sets are time-dependent at low stress levels; as a result, the exponential lifetime distribution is not valid. Plans are discussed for accelerated life-tests of pre-production units, methods for choosing sample sizes, and in-service replacement policies.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6293332
• Report Number(s): UCID-17755(Pt.3)
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
PRESSURE VESSELS
FRACTURE PROPERTIES
SERVICE LIFE
ARAMIDS
COMPOSITE MATERIALS
EPOXIDES
RUPTURES
STATISTICS
STRESSES
CONTAINERS
FAILURES
MATHEMATICS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
420200* - Engineering- Facilities
Equipment
& Techniques