AMADE in the European Conference of Composite Materials – ECCM 2018 in Athens

ECCM18_AMADE

AMADE in the European Conference of Composite Materials – ECCM 2018 in Athens

AMADE has been very well represented in the European Conference of Composite Materials – ECCM 2018 in Athens (June 25 to 28). Albert Turon, Norbert Blanco, Magdalena Pérez, Jordi Llobet, Aravind Sasikumar and Rodrigo Tavares have had the opportunity to communicate their latest advances in research before an expert audience. Their contributions have been:

Jordi Llobet’s contribution:
Title: Progressive Damage Modelling of notched carbon/epoxy laminates under tensile fatigue loadings
Authors: J. Llobet, P. Maimí, A. Turon, B. L. V. Bak, E. Lindgaard, Y. Essa and F. M. de la Escalera
Keywords: Continuum Damage Models, Cohesive Zone Modelling, Fatigue, Fracture, Open-hole specimens
Summary: This work aims to simulate the initiation and propagation of intralaminar and interlaminar damage in open-hole carbon/epoxy laminates subjected to tension-tension fatigue loadings. The experimental observations revealed that the fatigue response of notched carbon/epoxy laminates is strongly governed by the progressive failure of the matrix, consisting of mainly longitudinal matrix splitting in 0º plies and delamination. These forms of damage alleviate the stress concentration at the hole and thus suppress fibre fracture. As a consequence, the laminate is significantly degraded but complete failure is never reached before 106 cycles even at stress levels of 75% of the ultimate strength.
The numerical results show the model’s capability to predict splitting cracks, delamination and its interaction under fatigue loadings, although at this stage the results are only judged qualitatively.
Project and Funding: ABORDA project by AERNNOVA Engineering.

 
 
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Magdalena Pérez’s contribution:
Title: Towards a consensus on mode II adhesive fracture testing and data reduction methods
Authors: M. Pérez-Galmés, J. Renart, C. Sarrado, A. Rodríguez-Bellido
Keywords: Fracture toughness, Adhesives, Mode II, Experimental testing.
Summary: Adhesive bonding is highly used in composite material repairs. The experimental measurement mode II fracture toughness still exhibits poor repeatability when using the different testing methods. In this work, a test campaign of adhesive joints has been carried out, in order to compare the measured mode II fracture toughness according to different methodologies and data reduction methods. In view of the results, a critical discussion on the suitability of the test methods available is presented.
Project and Funding: Spanish Government through the Ministerio de Economia y Competitividad under the contracts TRA2015-71491-R and
MAT2015-69491-C3-1-R.

Aravind Sasikumar’s contribution:
Title: Experimental study to understand the effect of delamination position on impact damage tolerance using unsymmetrical laminates
Authors: Aravind Sasikumar, Daniel Trias, S.M. García-Rodríguez, Josep Costa
Keywords: Impact behavior, Damage mechanics, Damage tolerance, Unsymmetrical laminates
Summary: Novel warp-free unsymmetrical laminates were designed and were subjected to impact, quasi-static indentation and compression after impact tests. The difference in damage patterns between the unsymmetrical laminates were studied and compared. Being one of the first works of impact study on unsymmetrical laminates, this work opens the door towards non-conventional laminate designs and allows the freedom to not follow the symmetry constraint.
Project and Funding: Generalitat de Catalunya for the FI-DGR pre-doctoral grant (2017 FI-B1 00089). Spanish Ministerio de Economia y Competitividad for the grant coded MAT2015-69491-C3-1-R and supported by FEDER/EU.

 
 
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Rodrigo P. Tavares’ contribution:
Title: Effect of intratow fibre hybridization on the fracture toughness of polymer composite materials
Authors: Rodrigo P. Tavares, Daniel Gizik. Christian Metzner, Christian Weimer, Albert Turon and Pedro P. Camanho
Keywords: Hybrid composites; Experimental testing
Summary: Tow spreading technique is used to comingle two types of fibres to produce intratow hybrid unidirectional tapes. Different materials, with different hybrid volume fractions, were manufacture and tested and their properties are compared.
Project and Funding: RP Tavares acknowledges the support of the Portuguese Government’s Fundação para a Ciência e Tecnologia, under the Grant SFRH/BD/115872/2016.