Experimental study of laminated composites containing manufacturing defects under combined stress states

H. T. Ali, M. I. Jones, L. F. Kawashita, S. R. Hallett

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

125 Downloads (Pure)

Abstract

Manufacturing defects are known to cause a knock-down in the mechanical properties of composite materials. These knock-downs are however usually only tested in simple stress states and not the more complex loading as found in real structural applications. Here a modified Arcan test fixture has been designed and manufactured to apply interlaminar shear in combination with through thickness compression to carbon fibre/epoxy composite laminates. The fixture is designed to accommodate a 30 × 30 mm size specimen and allows the ratio of interlaminar shear to through-thickness compression applied to the specimen to be varied by altering the angle of the fixture. The material used in this study is the Hexply® IM7/8552 and the ply stacking sequence of the laminates is [+452/902/-452/02]3S, giving a nominal specimen thickness of 6 mm. The study included pristine specimens as well as specimens with an artificially embedded out-of-plane wrinkle defect which was generated by inserting a precise pattern of narrow pre-preg strips with 90° orientation across the width of the laminate during lay-up, which during cure merged with adjacent 90° plies in the stack. This experimental study has investigated failure stresses and failure modes for both pristine and wrinkle defect specimens, tested over a range of interlaminar shear to through thickness compression stress ratios.

Original languageEnglish
Title of host publicationProceedings of the American Society for Composites 2016
Subtitle of host publicationThirty-First Technical Conference on Composite Materials
EditorsBarry D Davidson, James G Ratcliffe, Michael W Czabaj
PublisherDEStech Publications, Inc.
Number of pages9
ISBN (Electronic)9781605953168
Publication statusPublished - 23 Sep 2016
Event31st Annual Technical Conference of the American Society for Composites, ASC 2016 - Williamsburg, United States
Duration: 19 Sep 201621 Sep 2016

Conference

Conference31st Annual Technical Conference of the American Society for Composites, ASC 2016
CountryUnited States
CityWilliamsburg
Period19/09/1621/09/16

Fingerprint Dive into the research topics of 'Experimental study of laminated composites containing manufacturing defects under combined stress states'. Together they form a unique fingerprint.

  • Cite this

    Ali, H. T., Jones, M. I., Kawashita, L. F., & Hallett, S. R. (2016). Experimental study of laminated composites containing manufacturing defects under combined stress states. In B. D. Davidson, J. G. Ratcliffe, & M. W. Czabaj (Eds.), Proceedings of the American Society for Composites 2016: Thirty-First Technical Conference on Composite Materials [1006] DEStech Publications, Inc.. https://mech.utah.edu/ASC2016/