Title: An Out-of-Autoclave Toughened Epoxy Prepreg System Curable at Different Curing Temperatures

Authors: Henry S. Villareal, Riley Harden, and Frank W. Lee

DOI: 10.33599/nasampe/c.19.0638

Abstract: An out of autoclave (OOA) processible toughened epoxy prepreg system showed very similar overall high mechanical properties with different curing temperatures, at 275 °F (135 °C), 300 °F (150 °C) and 356 °F (180 °C). These mechanical properties include CAI, G₁C, G₂C, OHC and OHT values. The system was also found to generate very mild exothermic heat under a simple one step dwell processing procedure. Thick laminates of up to 800 plies, about 4”, were made without any ill effect and with very minimum void content. It has great moisture resistance and absorbs under 0.8% of moisture after 2 weeks at 72 °C (160 °F) water bath. The hot/wet property retention is excellent. The applications for this toughened prepreg system include primary structural parts in space and aerospace areas.

References: 1. ASTM D3039, 2000, “Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials” ASTM International, West Conshohocken, PA, 2010, DOI: 10.1520/D3039_D3039M-17, www.astm.org. 2. ASTM D695, 2002, “Standard Test Method for Compression Properties of Rigid Plastics” ASTM International, West Conshohocken, PA, 2010, DOI: 10.1520/D0695-15, www.astm.org. 3. ASTM D3518, 1995, “Standard Test Method for In-Plane Shear Response of Polymer Matrix Composite Materials by Tensile Test of a ±45° Laminate” ASTM International, West Conshohocken, PA, 2010, DOI: 10.1520/D3518_D3518M-18, www.astm.org. 4. ASTM D2344, 2000, “Standard Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates” ASTM International, West Conshohocken, PA, 2010, DOI: 10.1520/D2344_D2344M-16, www.astm.org. 5. ASTM D6641, 2016, “Standard Test Method for Compressive Properties of Polymer Matrix Composite Materials using a Combined Loading Compression test Fixture” ASTM International, West Conshohocken, PA, 2010, DOI: 10.1520/D6641_D6641M-16, www.astm.org. 6. ASTM D5766, 2011, “Standard Test Method for Open- Hole Tensile Strength of Polymer Matrix Composite Laminate” ASTM International, West Conshohocken, PA, 2010, DOI: 10.1520/D5766_D5766M-11, www.astm.org. 7. ASTM D6484, 2014, “Standard Test Method for Open- Hole Compressive Strength of Polymer Matrix Composite Laminate” ASTM International, West Conshohocken, PA, 2010, DOI: 10.1520/D6484_D6484M-14, www.astm.org. 8. ASTM D7137, 2017, “Standard Test Method for Compressive Residual Strength Properties of Damaged Polymer Matrix Composite Plates” ASTM International, West Conshohocken, PA, 2010, DOI: 10.1520/D7137_D7137M-17, www.astm.org. 9. Villareal, H., Unger, S., Lee, F. Advancement of Out of Autoclave (OOA) Technology at Tencate Advanced Composites (II), USA. International SAMPE Symposium, Seattle, 2017.

Conference: CAMX 2019

Publication Date: 2019/09/23

SKU: TP19-0638

Pages: 15

Price: $30.00