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Title: Fiber composite materials technology development

The FY1980 technical accomplishments from the Lawrence Livermore National laboratory (LLNL) for the Fiber Composite Materials Technology Development Task fo the MEST project are summarized. The task is divided into three areas: Engineering data base for flywheel design (Washington University will report this part separately), new materials evaluation, and time-dependent behavior of Kevlar composite strands. An epoxy matrix was formulated which can be used in composites for 120/sup 0/C service with good processing and mechanical properties. Preliminary results on the time-dependent properties of the Kevlar 49/epoxy strands indicate: Fatigue loading, as compared to sustained loading, drastically reduces the lifetime of a Kevlar composie; the more the number of on-off load cycles, the less the lifetime; and dynamic fatigue of the Kevlar composite can not be predicted by current damage theories such as Miner's Rule.
Authors:
Publication Date:
OSTI Identifier:
6974734
Report Number(s):
UCRL-85106
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Technical Report
Research Org:
California Univ., Livermore (USA). Lawrence Livermore Lab.
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; COMPOSITE MATERIALS; FATIGUE; MECHANICAL PROPERTIES; FLYWHEELS; EPOXIDES; EXPERIMENTAL DATA; MATERIALS TESTING; DATA; INFORMATION; MATERIALS; MECHANICAL ENERGY STORAGE EQUIPMENT; NUMERICAL DATA; ORGANIC COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; TESTING 250500* -- Energy Storage-- Flywheels