Time filter

Source Type

North Kingsville, OH, United States

Faudree M.C.,Tokai University | Nishi Y.,Tokai University | Gruskiewicz M.,Premix, Inc.
Materials Transactions | Year: 2012

Compression-molded short-fiber GFRP-BMC panels have random distribution of solidification texture angles from zero to 90 degrees in the center of the mother panels. Hence, there is significantly lower impact strength in the panel center than in the outside. However, experimental results showed homogeneous low voltage electron beam irradiation (HLEBI) applied to the center region apparently enhances the Charpy impact values (a uc) 5 to 25%. Fracture mechanism was observed to convert at a uc ̃5.46.7 kJ·m -2 from clean to secondary microcrack proliferation and/or bends near the main crack, with increasing fracture surface area as a uc increased. SEM observation revealed 0.86MGy HLEBI treated GFRP had much more polymer adhering to fibers than the untreated. This increased matrix adhesion can be explained by electron spin resonance (ESR) peaks indicating dangling bonds are generated creating repulsive forces between outer shell electrons in the polymer matrix, apparently exhibiting increased compressive stress on the fibers increasing adhesion force. Moreover, the lone pair electrons generated in the matrix may have bonded with the fibers more efficiently. For these reasons, increased fiber-matrix adhesion seen in the 0.86MGy samples appears to assist for more internal cracking, increasing resilience to impact of the GFRP-BMC, raising the a uc. © 2012 The Japan Institute of Metals.

Butler K.I.,Premix, Inc.
CAMX 2014 - Composites and Advanced Materials Expo: Combined Strength. Unsurpassed Innovation. | Year: 2014

Monomer free unsaturated polyester thermoset resins have been available for a number of years in other industrial applications especially as protective coatings in the electrical industry. Recently monomer free unsaturated polyester and or vinyl ester thermoset resins have moved into the composite arena mostly as hot melt type resins for prepreg processes, or as liquid versions for infusion, pultrusion, resin transfer, wet-molding, and BMC processes. The traditional sheet molding compound (SMC) process was not considered as a viable process as the monomer free liquid resins have seen draw backs in producing a thickenable sheet. It has been found that modifications to the sheet molding compound formula that incorporate the monomer free resins now enabled the use of the monomer free resins in the traditional SMC processes. The sheet molding compound can employ the use of the traditional fillers (calcium carbonate and alumina trihydrate), initiator systems, pigments, monomer free shrinkage control agents, and reinforcements (glass or carbon fibers). This paper will explore, and demonstrate the properties of the monomer free sheet molding compound systems.

Faudree M.C.,Tokai University | Nishi Y.,Tokai University | Gruskiewicz M.,Premix, Inc.
Materials Transactions | Year: 2013

There is an extensive body of research and texts on numerical simulation to obtain rheological properties of injection molded resins and composites, however to our knowledge there is no or little research on estimating velocity profile from fiber orientation mapping of GFRPBMCs (glass fiber reinforced polymer bulk molding compounds). This study reports a simple analysis of specific laminar creep flow properties of highly-filled short-fiber GFRP-BMC through a dogbone specimen as a rectangular duct during injection molding from SEM fiber orientation mapping which is found to exhibit a 3-layer [skin-core-skin] structure resembling classical laminar flow through a conduit. Therefore, to characterize the BMC with extremely low Reynolds number -2 © 10-4, velocity profile, primary and secondary boundary layers were estimated from Hermans fiber orientation parameter across gauge section thickness. ©2013 The Japan Society for Technology of Plasticity.

Premix, Inc. | Date: 2014-06-19

fiber reinforced thermoset composites.

Premix, Inc. | Date: 2016-07-12

fiber reinforced thermoset composites, namely, semi-processed fiber-reinforced resins for use as sheet molding compounds in structural and semi-structural applications.

Discover hidden collaborations