Interlaminar fracture toughness and associated fracture behaviour of bead-filled epoxy/glass fibre hybrid composites

1995 ◽  
Vol 30 (24) ◽  
pp. 6179-6191 ◽  
Author(s):  
Jung Ju Lee ◽  
Chang Min Suh
Keyword(s):  
Fracture Toughness ◽  
Glass Fibre ◽  
Fracture Behaviour ◽  
Hybrid Composites ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture

Interlaminar Fracture of CF/EP Composites Modified with Nano-Silica

2007 ◽  
Vol 121-123 ◽  
pp. 1403-1406 ◽  
Author(s):  
Shi Qiang Deng ◽  
P. Rosso ◽  
Lin Ye ◽  
Klaus Friedrich
Keyword(s):  
Fracture Toughness ◽  
Fracture Behaviour ◽  
Mode I ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Nano Silica ◽  
Interlaminar Fracture ◽  
Transverse Tension ◽  
Tension Tests ◽  
Nano Additives

Fracture toughness and other mechanical properties of epoxies modified with nano-slica particles were measured to elaborate effects of nano-additives on fracture behaviour of the modified epoxies. Interlaminar fracture behaviours of the nano-silica modified CF/EP composites were subsequently investigated by conducting Mode-I and Mode-II interlaminar fracture toughness tests as well as transverse tension tests. It was found that the fracture toughness of the nano-silica modified epoxies and the interlaminar fracture toughness of nano-silica modified CF/EP composites have been increased significantly (>50%), while the strength and modulus of the materials remain unchanged or slightly higher. In particular, the nano-silica modified epoxies showed only very little reduction in the glass transition temperature (Tg).

scholarly journals On the extent of fracture toughness transfer from 1D/2D nanomodified epoxy matrices to glass fibre composites

2020 ◽  
Vol 55 (11) ◽  
pp. 4717-4733 ◽  
Author(s):  
Nadiim Domun ◽  
Keith R. Paton ◽  
Bamber R. K. Blackman ◽  
Cihan Kaboglu ◽  
Samireh Vahid ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Boron Nitride ◽  
Glass Fibre ◽  
Mode I ◽  
Interlaminar Fracture Toughness ◽  
Gfrp Composites ◽  
Interlaminar Fracture ◽  
Gfrp Composite ◽  
The Matrix ◽  
Matrix Toughness

AbstractIn this study, the effects of adding nanofillers to an epoxy resin (EP) used as a matrix in glass fibre-reinforced plastic (GFRP) composites have been investigated. Both 1D and 2D nanofillers were used, specifically (1) carbon nanotubes (CNTs), (2) few-layer graphene nanoplatelets (GNPs), as well as hybrid combinations of (3) CNTs and boron nitride nanosheets, and (4) GNPs and boron nitride nanotubes (BNNTs). Tensile tests have shown improvements in the transverse stiffness normal to the fibre direction of up to about 25% for the GFRPs using the ‘EP + CNT’ and the ‘EP + BNNT + GNP’ matrices, compared to the composites with the unmodified epoxy (‘EP’). Mode I and mode II fracture toughness tests were conducted using double cantilever beam (DCB) and end-notched flexure (ENF) tests, respectively. In the quasi-static mode I tests, the values of the initiation interlaminar fracture toughness, $$ G_{\text{IC}}^{\text{C}} $$GICC, of the GFRP composites showed that the transfer of matrix toughness to the corresponding GFRP composite is greatest for the GFRP composite with the GNPs in the matrix. Here, a coefficient of toughness transfer (CTT), defined as the ratio of mode I initiation interlaminar toughness for the composite to the bulk polymer matrix toughness, of 0.68 was recorded. The highest absolute values of the mode I interlaminar fracture toughness at crack initiation were achieved for the GFRP composites with the epoxy matrix modified with the hybrid combinations of nanofillers. The highest value of the CTT during steady-state crack propagation was ~ 2 for all the different types of GFRPs. Fractographic analysis of the composite surfaces from the DCB and ENF specimens showed that failure was by a combination of cohesive (through the matrix) and interfacial (along the fibre/matrix interface) modes, depending on the type of nanofillers used.

Effects of Near Interfacial Microstructure on Interlaminar Fracture Toughness of Hybrid Metal-Polymer Composites

1993 ◽  
Vol 318 ◽  
Author(s):  
Alexander S. Grabilnikov ◽  
Oleg M. Zinevich
Keyword(s):  
Fracture Toughness ◽  
Boundary Layers ◽  
Fracture Resistance ◽  
Thermal Stresses ◽  
Hybrid Composites ◽  
Interlaminar Fracture Toughness ◽  
Energy Effect ◽  
Interlaminar Fracture ◽  
Aramid Fibres ◽  
Wide Range

ABSTRACTResults of detailed study on interlaminar fracture toughness of hybrid aramid-epoxy/aluminum laminate composites are presented. A fracture mechanics approach has been adopted and Mode-I, Mode-II tests for a wide range of loading rates have been used. Hybrid composite failure loci has been studied using SEM technique. Results were analyzed from the point of view of metal substrate/aramid fibre surface free energy effect on near interfacial (in the boundary layers) microstructure and fracture toughness of elastomer modified epoxy resins. It has been shown, that toughened epoxy resin morphology (rubber particles size and volume content) and, as a result, fracture resistance of the boundary layers were strongly dependent upon the adsorption processes, that could take place during adhesion contact formation and curing. To increase interfacial fracture toughness of hybrid composites due to the improvement of near interfacial resin microstructure and boundary layer fracture resistance, as for aluminum-epoxy and for aramid-epoxy failure loci, metal sheets/aramid fibres surface properties and interfacial residual thermal stresses should be optimized. The last result has been achieved by means of si lane primer treatment of aluminum laminates and tensile loading of cured composite.

Interlaminar Fracture Toughness of Hybrid Composites with Non-Woven Tissue

2000 ◽  
Vol 2000 (0) ◽  
pp. 85-86
Author(s):  
Seung Hwan LEE ◽  
Young Bae KIM ◽  
Jin Shik KANG ◽  
Hiroshi NOGUCHI ◽  
Seong Kyun CHEONG
Keyword(s):  
Fracture Toughness ◽  
Hybrid Composites ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture
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