Experimental investigation of the effect of CNT addition on the strength of CFRP curved composite beams

2015-01-01
Arca, M.A.
Uyar, I.
Çöker, Demirkan
Carbon nanotubes (CNT) have been attracting attention as a toughening material in composite matrix due to their excellent mechanical properties. However, superior properties of CNTs have not yet been realized in the strengthening of composites against fracture. This study focuses on investigating the effect of CNT variation in the epoxy resin on the strength of curved composite beams. Specimens are [0/90] fabric carbon/epoxy composite laminates manufactured by hand layup technique 3 % wt CNT fractions in the epoxy resin. Curved beam composite laminates were subjected to four point bending loading according to ASTM D6415/D6415M–06a and the load displacement plot is recorded. Digital Image Correlation technique is used to obtain deformation field in the laminate at the curved region just before delamination failure initiates. A high speed camera at 28,000 fps was used to capture the deformation sequence after initiation of failure. For the CNT added laminate, both CBS and failure load is found to decrease with the load-displacement behavior found to change from single load drop to multiple load drops. In addition, delamination is found to be constrained to the curved region for the CNT added laminate in contrast to the base laminate where delamination extends to the arms.

Suggestions

Experimental Investigation of the Effect of CNT addition on the strength of CFRP Curved Composite Beams,
Miray, Arca; Uyar, Imren; Çöker, Demirkan (null, Springer, 2015-01-01)
Carbon nanotubes (CNT) have been attracting attention as a toughening material in composite matrix due to their excellent mechanical properties. However, superior properties of CNTs have not yet been realized in the strengthening of composites against fracture. This study focuses on investigating the effect of CNT variation in the epoxy resin on the strength of curved composite beams. Specimens are [0/90] fabric carbon/epoxy composite laminates manufactured by hand layup technique 3 % wt CNT fractions in th...
Experimental Investigation of Strength of Curved Beam by Thin Ply Non-Crimp Fabric Laminates
Arca, M. A.; PAPİLA, MELİH; Çöker, Demirkan (2016-06-09)
Resistance against delamination failure and through the thickness tensile properties of curved carbon fiber reinforced plastics composites are investigated experimentally by conducting the curved beam strength tests. Effect of novel material thin ply non crimp fabric (NCF) architecture on delamination resistance of carbon fiber reinforced composites are investigated and compare with that of standard UD layups. In order to determine through the thickness tensile properties of curved carbon fiber composites, ...
Experimental Observations of Dynamic Delamination in Curved [0] and [0/90] Composite Laminates
Imren, Uyar; Miray, Arca; Burak, Gozluklu; Çöker, Demirkan (null, Springer, 2015-01-01)
Curved composite parts are increasingly replacing metal ribs and box structures in recent civil aerospace structures and wind turbine blades. Delamination of L-shaped composite laminates occurs by interlaminar opening stresses in addition to the interlaminar shear stresses at the curved region. An experimental setup is designed to investigate dynamic delamination in L-shaped composite brackets under quasi static shear loading. The materials are unidirectional [0]17and cross-ply [0/90]17 epoxy/graphite compo...
Investigating the mechanical properties of single walled carbon nanotube reinforced epoxy composite through finite element modelling
Zuberi, Muhammad Jibran Shahzad; Esat, Volkan (2015-03-15)
Varying experimental results on the mechanical properties of carbon nanotube reinforced polymer composites (CNTRPs) have been reported due to the complexities associated with the characterization of material properties in nano-scale. Insight into the issues associated with CNTRPs may be brought through computational techniques time- and cost-effectively. In this study, finite element models are generated in which single walled carbon nanotube models are embedded into the epoxy resin. For modelling interface...
MECHANICAL PROPERTIES OF REPAIRED CARBON FIBER REINFORCED POLYMER COMPOSITES
Sonat, Emine Evren; Özerinç, Sezer; Department of Mechanical Engineering (2021-12-10)
Carbon fiber reinforced polymer (CFRP) composites are increasingly used in the aerospace industry due to their high specific strength compared to conventional metallic materials. However, a significant shortcoming of these composites is their increased susceptibility to damage. Structural repair is a common method to restore the load-carrying capacity of a damaged part when the damage size exceeds the pre-defined tolerances. Scarf and stepped bonded repair methods are the primary choice for cases that requi...
Citation Formats
M. A. Arca, I. Uyar, and D. Çöker, “Experimental investigation of the effect of CNT addition on the strength of CFRP curved composite beams,” 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/49074.