PPG Industries (Pittsburgh, Pa., USA) will showcase its portfolio of fiberglass products and technologies, as well as present two technical seminars at CAMX 2014. Featured in the booth will be GL-certified HYBON direct roving, INNOFIBER specialty fiber glass compositions and TUFROV long fiber thermoplastic rovings. Materials from PPG will also be available for its other reinforcement materials and industrial and specialty yarns.
In the conference, Ryan Emerson, Ph.D., PPG group leader for applications development, in collaboration with Brandon Strohminger, A&P Technology applications engineer, will present, “Crash Performance of Variable Stiffness Braided Fiber Glass Composites.” This paper evaluates the energy-absorbing behavior of braided fiber glass composites made with novel fiber glass reinforcements to simulate their performance during low-speed crash events. Fiber glass/epoxy tubes were braided with axial and bias reinforcements (30°, 60°, and 75° off-axis) and three fiberglass compositions: E-Glass, a high-modulus fiber and a high-elongation fiber. Five to seven specimens from 15 sample types were destructively tested with an instrumented drop-weight impact tower at speeds of approximately 6,400 mm/s. Subsequent analysis of force-time history showed that some architectures exhibited the desirable characteristic for this application wherein energy is absorbed very uniformly during crush.
Pu Gu, PPG senior research associate, and James C. Watson, associate director for PPG Fiber Glass Science & Technology, will present “Corrosion Resistance of E-Glass Fiber-Reinforced Composites: Boron and Interface Factors.” Abstract: Boron-free E-CR glass fibers behave differently than boron-containing E-glass fibers in acidic environments, especially in strong acids. The modified glass chemistry leads to a significantly different leaching mechanism in an acidic environment and results in superior acid corrosion resistance for the boron-free E-CR glass fibers when used in a fiber reinforced polymer. In less acidic or alkaline environments, the corrosion mechanism for boron-containing E-glass fibers is no longer dominated by the dissolution of borate species and is more likely shifted to hydrolysis of the silicate network. In this study, stress rupture conditions were used to evaluate the durability and corrosion resistance of E- and E-CR glass fiber reinforced vinyl ester composites in de-ionized water, sea water, and sodium hydroxide solutions.
Editor PickComposites in the Martian suit
When humans do finally travel to Mars, they will have to be well protected from a less-than-hospitable environment. The suit designed to do the job is already in development at NASA, and it relies heavily on composites.