Impact and compression behaviour of AFP manufactured carbon/epoxy composites containing gaps and overlaps

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Proceedings title26th Annual Technical Conference of the American Society for Composites 2011 and the 2nd Joint US-Canada Conference on Composites
Conference26th Annual Technical Conference of the American Society for Composites 2011 and the 2nd Joint US-Canada Conference on Composites, 26 September 2011 through 28 September 2011, Montreal, QC
Pages11631179; # of pages: 17
SubjectCarbon/epoxy composites; Classical laminate theory; Compression after impact tests; Compression behaviours; Compressive properties; Defect configurations; Impact response; Impact test; Local effects; Maximum strength; OHC strength; Open holes; Strength reduction; Ultrasonic C-scan; Mechanical properties; Stress concentration; Defects
AbstractThe objective of this paper is to present the effect of gaps and overlaps on the mechanical properties of an AFP manufactured 24-plies quasi-isotropic carbon/epoxy composite. Tests are carried out using 7 defect configurations in Open Hole Compression (OHC) specimens (ASTM D 6484) and 4 defect configurations in drop weigh impact tests specimens (ASTM D7136). Ultrasonic C-scan observations and compression after impact tests (ASTM D7137) were performed on impacted specimen. Tests results show that 90° defects have the most important effect on OHC strength (between 7% and 13% strength reduction for 90° gaps) due to 45° plies waviness whereas specimen with 0° gaps or 0° overlaps have a maximum strength variation of 7%. It is also observed that AFP defects have a local effect on composite impact response but they do not have a significant effect on coupons impact response. An analytical model which predicts the effect of 0° defects on the compressive properties is proposed in this paper. Using classical laminate theory, this model recalculates the material's properties considering the effect of the defect on the global mechanical properties of the specimen. The prediction of the model show very good agreement with the experimental results and demonstrate that 0° defects do not create stress concentrations which lead to specimen failure.
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AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271057
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Record identifier36fc4490-4f12-4e0d-92a4-a2e487dbcbae
Record created2014-03-24
Record modified2016-05-09
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