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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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| Stamoulis, Georgios; Carrere, Nicolas; Cognard, J. Y.; Davies, Peter; Badulescu, Claudiu. |
| The use of adhesively bonded structures is widespread in various engineering fields, as they provide many advantages over other conventional types of mechanical joints. In this study, we use a crash optimized, single-component epoxy adhesive (SikaPower®-498 made of a rigid epoxy matrix containing soft, tough polymer inclusions that provide additional ductility to the adhesive layer) at a constant layer thickness of 0.5 mm to bond metallic substrates. We investigate its fracture properties under mode I and mixed-mode I/II loadings, in order to obtain the full fracture envelope. Mode I loading has been performed using the ISO 25217 standard: the substrates were designed according to the TDCB (Tapered Double Cantilever Beam) geometry, and the fracture... |
| Tipo: Text |
Palavras-chave: Fracture toughness; Linear Elastic Fracture Mechanics (LEFM); Adhesive bonding; Finite Element Analysis (FEA); Failure criterion. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00181/29273/27685.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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