SciELO - Scientific Electronic Library Online

 
vol.12 issue4Biomaterial based novel polyurethane adhesives for wood to wood and metal to metal bondingEffect of solvents on the morphological characterization of enteric nanoparticles author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Materials Research

Print version ISSN 1516-1439

Abstract

TARPANI, José Ricardo; MALUF, Omar  and  GATTI, Maria Cristina Adami. Charpy impact toughness of conventional and advanced composite laminates for aircraft construction. Mat. Res. [online]. 2009, vol.12, n.4, pp.395-403. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392009000400004.

A weight-based analysis was made of the translaminar Charpy impact toughness performance of conventional and advanced composite materials for aircraft fabrication. The materials were carbon-epoxy (C-Ep) and hybrid fiber-metal TiGr (Titanium-Graphite) laminates. 5 mm-thick three-point bend specimens were tested over a temperature range of -70 to 180 ºC to reproduce typical in-service conditions of supersonic jetliners. The energies required for the processes of damage initiation (Ei), damage propagation (Ep), and whole fracture (Et = Ei + Ep), were evaluated at two loading rates, namely, 2.25 and 5.52 m/s in an instrumented Charpy impact testing machine. C-Ep laminates with unidirectional fiber tapes arranged in cross-ply architecture consistently showed the best performance in terms of damage initiation toughness, whereas the hybrid fiber-metal laminate TiGr excelled in terms of propagation toughness. On the other hand, the overall performance of bi-directional fabric C-Ep laminates was very disappointing. The impact behavior of composite laminates was substantiated by a qualitative analysis of topographic aspects of fracture surfaces.

Keywords : Charpy impact testing; composite laminates; dynamic translaminar fracture; impact toughness.

        · text in English     · English ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License