Investigation on Stress-Rupture Behavior of a Chopped-Glass-Fiber Composite for Automotive Durability Design Criteria Page: 2 of 40
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great potential, one of the concerns of the Automotive Composites Consortium is the durability of
the materials [5]. An automobile is generally designed for a service life of 15 years, during which
the materials are subjected to sustained and cyclic loading, exposed to temperature changes and
various hinds of fluids. These factors may significantly affect the stress-rupture strength of the
materials. The present investigation is a part of the U. S. Department of Energy Advanced
Automotive Materials project "Durability of Lightweight Composite Structures for Automotive
Applications". The primary goal of this investigation is to develop experimentally based stress-
rupture design guidelines to assure the 15 year long-term integrity of polymeric composite
automotive structures.
2. Material
The material was a polymeric composite with a urethane-based matrix reinforced by 28.9
vol% of 50 mm chopped E-glass fibers. The matrix was identified as Baydur 420 IMR produced
by Bayer Corporation. The IMR denotes "internal mold release". The chopped fiber preform
was made by the P4 process recently developed by Owens-Corning in Battice, Belgium. The
matrix consisted of polyol and polymeric isocyanate with an amine coreactant to produce a cross-
linked urea-urethane basic structure. The urea component contributes to the heat resistance of
the final composite structure. The matrix was produced via the Structural Reaction Injection
Molding (SRIM) process in which the two reactive streams, polyol and polymeric isocyanate,
were pumped at high pressure into an impingement mixing chamber to quickly produce a uniform
mixture of the components. The reacting mixture was then pumped into a closed mold containing
the reinforcement. The reaction time necessary to transform the liquid chemical reactants into the
Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U. S. Department of Energy under contract DE-AC05-
000R22725.2
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Ren, W. Investigation on Stress-Rupture Behavior of a Chopped-Glass-Fiber Composite for Automotive Durability Design Criteria, report, August 24, 2001; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc720680/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.