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| Baral, N; Guezenoc, H; Davies, Peter; Baley, C. |
| This paper presents test results from mode I interlaminar fracture and transverse tensile tests on unidirectional carbon/epoxy composites used in racing yacht construction. Fibre modulus has been varied from 380 to 640 GPa. PAN fibre reinforced composite properties, delamination resistance (G(Ie) and G(Ip)) and transverse strain to failure, decrease as fibre modulus increases. Composites based on the highest modulus pitch fibres show higher transverse failure strains than the highest modulus PAN fibre composites. A distinct failure mechanism, crack propagation within the fibres, was observed for the pitch based reinforcement. The transverse tensile tests allowed transverse fibre modulus to be estimated as 11.5 GPa for the PAN and 9 GPa for the pitch... |
| Tipo: Text |
Palavras-chave: Carbon fibre; Fracture; Deformation; Delamination; Composite materials. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3723.pdf |
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| Floreani, Christophe; Robert, Colin; Alam, Parvez; Davies, Peter; Ó. Brádaigh, Conchúr M.. |
| Powder epoxy composites have several advantages for the processing of large composite structures, including low exotherm, viscosity and material cost, as well as the ability to carry out separate melting and curing operations. This work studies the mode I and mixed-mode toughness, as well as the in-plane mechanical properties of unidirectional stitched glass and carbon fibre reinforced powder epoxy composites. The interlaminar fracture toughness is studied in pure mode I by performing Double Cantilever Beam tests and at 25% mode II, 50% mode II and 75% mode II by performing Mixed Mode Bending testing according to the ASTM D5528-13 test standard. The tensile and compressive properties are comparable to that of standard epoxy composites but both the mode I... |
| Tipo: Text |
Palavras-chave: Toughened composites; Fracture toughness; Delamination. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00692/80371/83488.pdf |
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| Davies, Peter; Sims, Gd; Blackman, Brk; Brunner, Aj; Kageyama, K; Hojo, M; Tanaka, K; Murri, G; Rousseau, C.; Gieseke, B; Martin, Rh. |
| This paper presents a summary of the tests performed within a Versailles Project on Advanced Materials and Standards collaborative test programme to examine the measurement of mode II interlaminar fracture toughness using four different test methods based on end notched flexure, stabilised end notched flexure, end loaded split, and four point end notched flexure carbon fibre reinforced epoxy specimens. Tests were performed by members of the European Structural Integrity Society, the Japan Industrial Standards group, and the American Society for Testing and Materials. PRC/1546 |
| Tipo: Text |
Palavras-chave: Delamination; Fracture tests; Mode II; Interlaminar shear; Fracture toughness. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00148/25883/24089.pdf |
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| Baral, N; Davies, Peter; Baley, C; Bigourdan, Benoit. |
| This paper presents a study of the delamination resistance Of unidirectional carbon fibre reinforced epoxy composites manufactured from prepreg for racing yacht mast applications. Fibre modulus has been varied from 290 to 640 GPa. Two manufacturing methods, oven cure under vacuum and autoclave, were used to produce samples. Results show that delamination resistance tinder mode I and mixed mode loading decreases as fibre modulus increases. The manufacturing route affects G, values by modifying interlaminar layer geometry but does not change the trend of lower toughness with increasing fibre modulus. For the pitch composites crack propagation is observed within the fibres, in addition to more usual matrix and interface cracking. For the very high modulus... |
| Tipo: Text |
Palavras-chave: Mixed mode; Fracture toughness; Polymers; Carbon fibres; Delamination. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3772.pdf |
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| Le Guen-geffroy, Antoine; Davies, Peter; Le Gac, Pierre Yves; Habert, Bertrand. |
| Carbon fiber reinforced composite materials are finding new applications in highly loaded marine structures such as tidal turbine blades and marine propellers. Such applications require long-term damage resistance while being subjected to continuous seawater immersion. However, few data exist on which to base material selection and design. This paper provides a set of results from interlaminar fracture tests on specimens before and after seawater ageing. The focus is on delamination as this is the main failure mechanism for laminated composites under out-of-plane loading. Results show that there are two contributions to changes in fracture toughness during an accelerated wet ageing program: effects due to water and effects due to physical ageing. These are... |
| Tipo: Text |
Palavras-chave: Composite; Delamination; Seawater; Immersion; Ageing. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00652/76410/77458.pdf |
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| Faria,Douglas Lamounier; Cruz,Thiago Moreira; Dias,Matheus Cordazzo; Duarte,Paulo Junio; Mendes,Lourival Marin; Guimarães Junior,José Benedito. |
| ABSTRACT This work aimed to evaluate the physical and mechanical behavior of glued laminated timber (GLT) - glulam pieces of Hevea brasiliensis treated with chromed copper arsenate (CCA), chromed copper borate (CCB) and pyrethroid in the production of GLT. The pieces were produced using three wooden laminae with dimensions of 60 x 20 x 1200 mm, (width x thickness x length), joined with epoxy adhesive under 1.0 MPa pressure for 24h at room temperature. The rubberwood had an apparent density of 0.624 g cm-3, a value close to that of Eucalyptus grandis wood, a species traditionally used in the manufacture of GLT. Regarding the GLT parts, it was observed that the preservative treatment with CCA and CCB influenced negatively the values of the mechanical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adhesive wood bonding; Static bending; Delamination; Preservative treatment. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100236 |
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