Low velocity impact response and damage of laminate composite glass fibre/epoxy based tri-block copolymer

Abstract Two types of laminate composites made of glass fibre/epoxy matrix (EPO_FV) and glass fibre/epoxy modified tri-block copolymer (Nanostrength) matrix (EPONS_FV) were manufactured by compression moulding. Some AFM investigations have been done to identify the Nanostrength dispersion in the epoxy matrix and some DMA analyses have been performed, at different frequencies, to understand the frequency or the strain rate sensitivity of both composites. Compared to EPO_FV, EPONS_FV exhibits a significant frequency/strain rate sensitivity. Impact resistance of the composite was investigated by means of low velocity impact tests. The low velocity impact results indicate that the addition of Nanostrength leads to the improved impact resistance and an increase in absorbed energy, especially at high impact energy level. SEM observations, performed on ion polished samples, reveal the presence of micro-cracks for both composites. Micro-cracks consist of a coalescence of fibre matrix de-bonding. It was also observed that EPONS_FV contains a lower density of micro-cracks compared to EPO_FV, confirming the fact that the composite with Nanostrength absorbs more energy by Nanostrength micelles cavitation.

[1]  D. J. Hourston,et al.  The toughening of epoxy resins with thermoplastics: 1. Trifunctional epoxy resin-polyetherimide blends , 1992 .

[2]  F. Bates,et al.  Structure and properties of PBO–PEO diblock copolymer modified epoxy , 2005 .

[3]  Peter Cawley,et al.  A review of defect types and nondestructive testing techniques for composites and bonded joints , 1988 .

[4]  P. Pfeiffer,et al.  Dispersion and morphology of polypropylene nanocomposites: Characterization based on a compact and flexible optical sensor , 2012 .

[5]  S. Jeelani,et al.  Processing of nanoclay filled sandwich composites and their response to low-velocity impact loading , 2008 .

[6]  Y. Thomann,et al.  Epoxy-layered silicate nanocomposites as matrix in glass fibre-reinforced composites , 2005 .

[7]  A. Yee,et al.  Toughening mechanisms in elastomer-modified epoxies , 1989 .

[8]  M.F.S.F. de Moura,et al.  Prediction of low velocity impact damage in carbon–epoxy laminates , 2002 .

[9]  Luigi Sorrentino,et al.  Drop-weight impact behaviour of woven hybrid basalt–carbon/epoxy composites , 2014 .

[10]  F. Léonardi,et al.  All acrylic block copolymers based on poly (methyl methacrylate) and poly (butyl acrylate). A link between the physico-chemical properties and the mechanical behaviour on impact tests , 2008 .

[11]  W. Cantwell,et al.  Comparison of the low and high velocity impact response of cfrp , 1989 .

[12]  R. Pyrz,et al.  Transverse crack growth in glass/epoxy composites with exactly positioned long fibres. Part II: numerical , 2001 .

[13]  K. Kanny,et al.  Resin infusion analysis of nanoclay filled glass fiber laminates , 2014 .

[14]  S. Ahzi,et al.  Micromechanical modeling of the elastic behavior of polypropylene based organoclay nanocomposites under a wide range of temperatures and strain rates/frequencies , 2013 .

[15]  U. Sundararaj,et al.  Study of matrix micro-cracking in nano clay and acrylic tri-block-copolymer modified epoxy/basalt fiber-reinforced pressure-retaining structures , 2011 .

[16]  J. Ferreira,et al.  Impact response of Kevlar composites with nanoclay enhanced epoxy matrix , 2013 .

[17]  S. Xu,et al.  Prediction of Low Velocity Impact Damage in carbon/epoxy Laminates☆ , 2013 .

[18]  C. Plummer,et al.  Microdeformation mechanisms in rubber toughened PMMA and PMMA-based copolymers , 2006 .

[19]  Tien-Wei Shyr,et al.  Impact resistance and damage characteristics of composite laminates , 2003 .

[20]  Philippe Viot,et al.  The influence of acrylate triblock copolymer embedded in matrix on composite structures’ responses to low-velocity impacts , 2012 .

[21]  E. C. Dias,et al.  Nano-structured sandwich composites response to low-velocity impact , 2010 .

[22]  Raymond A. Pearson,et al.  The toughening mechanism in hybrid epoxy-silica-rubber nanocomposites (HESRNs) , 2010 .

[23]  B. Ashrafi,et al.  Enhancement of mechanical performance of epoxy/carbon fiber laminate composites using single-walled carbon nanotubes , 2011 .

[24]  M. D. de Moura,et al.  Delamination Effect on Bending Behaviour in Carbon–Epoxy Composites , 2011 .

[25]  Z. Xin,et al.  Morphology and mechanical properties of nanostructured blends of epoxy resin with poly(ɛ-caprolactone)-block-poly(butadiene-co-acrylonitrile)-block-poly(ɛ-caprolactone) triblock copolymer , 2009 .

[26]  Bulent Murat Icten,et al.  An experimental investigation of the impact response of composite laminates , 2009 .

[27]  U. Sundararaj,et al.  Mode-I interlaminar fracture behaviour of nanoparticle modified epoxy/basalt fibre-reinforced laminates , 2013 .

[28]  Bodo Fiedler,et al.  Influence of nano-modification on the mechanical and electrical properties of conventional fibre-reinforced composites , 2005 .

[29]  F. V. Antunes,et al.  Effect of Interlayer Delamination on Mechanical Behavior of Carbon/Epoxy Laminates , 2009 .

[30]  J. Ferreira,et al.  Impact strength of composites with nano-enhanced resin after fire exposure , 2014 .

[31]  A. Vázquez,et al.  Influence of the addition of montmorillonite to the matrix of unidirectional glass fibre/epoxy composites on their mechanical and water absorption properties , 2008 .

[32]  G.A.O. Davies,et al.  Impact damage and residual strengths of woven fabric glass/polyester laminates , 1996 .

[33]  G. Caprino,et al.  Residual Strength Prediction of Impacted CFRP Laminates , 1984 .

[34]  P. Viot,et al.  Preparation and mechanical characterisation of laminate composites made of glass fibre/epoxy resin filled with tri bloc copolymers , 2014 .

[35]  J. C. Prichard,et al.  The role of impact damage in post-impact compression testing , 1990 .

[36]  V. L. Saponara,et al.  Electrochemical investigation of galvanic corrosion between aluminum 7075 and glass fiber/epoxy composites modified with carbon nanotubes , 2012 .

[37]  A. Yee,et al.  Toughening mechanisms in elastomer-modified epoxies , 1986 .

[38]  M. D. de Moura,et al.  Residual Strength after Low Velocity Impact in Carbon-Epoxy Laminates , 2006 .

[39]  Patricia Coronado,et al.  Influence of temperature on the delamination process under mode I fracture and dynamic loading of two carbon–epoxy composites , 2015 .

[40]  M. D. Moura,et al.  Damage detection on laminated composite materials using several NDT techniques , 2012 .

[41]  K. Iqbal,et al.  Impact damage resistance of CFRP with nanoclay-filled epoxy matrix , 2009 .