Compression after impact strength of out-of-autoclave processed laminates

Abstract

Out-of-autoclave processable fiber/resin systems have been gaining much attention due to the elimination of needing a costly autoclave large enough to hold the part to be cured. For large composite structures this can pose a challenge. However, for these fiber/resin systems to replace conventional autoclave fiber/resin systems for use on aerospace structures, the damage tolerance capabilities need to meet (or exceed) those of current autoclave fiber/resin systems. In this experimental study, compression-after-impact strengths of two commercially available out-of-autoclave fiber/resin systems are compared to compression-after-impact strengths of a conventional autoclave fiber/resin system used as a baseline in this study. compression-after-impact testing was chosen since this is the most common method to assess laminates damage tolerance capabilities. Three different levels of impact severity were chosen and information on damage size and morphology are assessed along with compression-after-impact strength values. The results show the two out-of-autoclave fiber/resin systems examined in this study have similar damage tolerance characteristics to the autoclave fiber/resin system used in this study.

Keywords

Out-of-autoclave compression-after-impact damage tolerance

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References

Gardiner G. Performance requirements: CAI vs. OHC. High Performance Composites, http://www.composites world.com/articles/performance-requirements-cai-vs-ohc (2011, accessed 29 October 2012).

Grimsley BW, Sutter JK, Burke ER, et al. Elevated temperature residual compression strength of impact-damaged sandwich structure manufactured out-of-autoclave. In: Proceedings, SAMPE, Baltimore, MD, 21–24 May 2012.

Dang C, Bernetich K, Carter E, et al. Mechanical comparison of out-of-autoclave prepreg part to conventional autoclave prepreg part. In: Proceedings of the American helicopter society 67th annual forum [CD ROM], Virginia Beach, VA, 3–5 May 2011.

Sutter JK, Kenner L, Pelham L, et al. Comparison of autoclave and out-of-autoclave composites. In: Proceedings 42nd international SAMPE symposium and technical conference, Salt lake City, UT, 11–14 October 2010.

Nettles AT, Jackson JR and Gates TS. Compression after impact testing of sandwich structures using a four point bend test. In: Proceedings, SAMPE fall technical conference and exhibition, Memphis, TN, 8–11 September 2008.

Nettles

Jackson

. Compression after impact testing of sandwich composites for usage on expendable launch vehicles. J Compos Mater 2010; 44: 707–738.

Nettles AT. Some examples of the relation between processing and damage tolerance. In: Proceedings 44th international SAMPE fall technical conference, Charleston, SC, 22–25 October 2012.