Title: Troubleshooting Common Prepreg Cure Failure Modes with Rheological Measurements
Authors: Unal Yilmazoglu, Richard Hanzlik
DOI: 10.33599/nasampe/s.24.0105
Abstract: Understanding the complexities of curing prepregs is crucial in composite material research. This study offers an in-depth exploration of prepreg cure failure modes drawing upon the capabilities of an encapsulated specimen rheometer that meets ASTM D7750. Central to the investigation are five determinants – out time, temperature, ramp rate, pressure, and layup orientation – and their effects on a select grade of prepreg. By examining these parameters, the study highlights the optimal conditions and presents insights into cure states and viscosity levels, aiming to further the reliability and performance of composite materials.
"References: [1]H. Lengsfeld, J. Lacalle, T. Neumeyer, and V. Altstädt, “Composite Technology,” in Composite Technology (Second Edition), H. Lengsfeld, J. Lacalle, T. Neumeyer, and V. Altstädt, Eds., Hanser, 2021, p. I–XXI. doi: 10.3139/9781569908266.fm. [2]L. C. Dorworth, G. L. Gardiner, and G. M. Mellema, Essentials of advanced composite fabrication and repair. Newcastle, Wash: Aviation Supplies & Academic, 2009. [3]M. L. Costa, M. C. Rezende, J. M. F. De Paiva, and E. C. Botelho, “Structural Carbon/Epoxy Prepregs Properties Comparison by Thermal and Rheological Analyses,” Polymer-Plastics Technology and Engineering, vol. 45, no. 10, pp. 1143–1153, Oct. 2006, doi: 10.1080/03602550600887251. [4]S. Kai and G. Yizhuo, “Resin pressure online measuring and evolution during autoclave zero-bleeding process,” 2010. [5]M. L. Costa, M. C. Rezende, and S. F. M. De Almeida, “Effect of Void Content on the Moisture Absorption in Polymeric Composites,” Polymer-Plastics Technology and Engineering, vol. 45, no. 6, pp. 691–698, Jul. 2006, doi: 10.1080/03602550600609549. [6]C. W. Macosko, Rheology: principles, measurements, and applications. in Advances in interfacial engineering series. New York, NY: VCH, 1994. [7]R. Pawlowski, Henry Tom, “Improving the Measurement of Prepreg Viscosity, Gel and Cure - SAMPE. [8]P. Hanzlik, Richard Henry, “Optimization of Cure Cycles Using an ESR (Encapsulated Sample Rheometer) - SAMPE. [9]S. Ray, “Rheology of Polymer/Layered Silicate Nanocomposites,” Journal of Industrial and Engineering Chemistry, 2006. [10]M. Hargis et al., “Calorimetric and Rheological Measurements of Three Commercial Thermosetting Prepreg Epoxies,” Journal of Composite Materials, vol. 40, no. 10, pp. 873–897, May 2006, doi: 10.1177/0021998305056380.
Conference: SAMPE 2024
Publication Date: 2024/05/20
SKU: TP24-0000000105
Pages: 16
Price: $32.00
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