By John Summerscales (auth.), Peter Davies, Yapa D.S. Rajapakse (eds.)

ISBN-10: 9400774168

ISBN-13: 9789400774162

ISBN-10: 9400774176

ISBN-13: 9789400774179

Composites are general in marine purposes. there's significant adventure of glass bolstered resins in boats and ships yet those will not be hugely loaded. despite the fact that, for brand new components equivalent to offshore and ocean strength there's a desire for hugely loaded buildings to outlive harsh stipulations for twenty years or extra. excessive functionality composites are for that reason being proposed. This publication offers an outline of the cutting-edge in predicting the long run longevity of composite marine constructions. the subsequent issues are covered:

• Modelling water diffusion

• harm caused through water

• speeded up testing

• together with sturdiness in design

• In-service experience.

This is key examining for all these concerned with composites within the marine undefined, from preliminary layout and calculation via to fabricate and repair exploitation. It additionally offers details unavailable in different places at the mechanisms fascinated by degradation and the way to take account of them. making sure long-term toughness isn't just valuable for safeguard purposes, yet also will be certain the industrial viability of destiny marine buildings.

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Extra info for Durability of Composites in a Marine Environment

Example text

Data re-elaborated in the form of normalized amount of cross- and self-HB are reported in Fig. 5. Gravimetric sorption isotherms have been then interpreted with NETGP-NRHB model. e. eÃh , eÃs and vÃsp;0 ) have been first determined by fitting experimental PVT data at high pressures (up to 2,000 atm) in the rubbery state (see [17]). This analysis was possible only in the case of 6FDA-ODA and 6FDA-6FpDA (results reported in Table 1) since in the case of PMDA-ODA degradation occurs in the proximity of its glass transition temperature, thus making it impossible to perform PVT characterization in the rubbery state.

1–2) HB interactions occurring in the PEEK-water mixtures at the four temperatures investigated. In Fig. 8 is reported,  wp as a function of water mass in particular, the predicted values for the ratio nwp n 11 12 fraction in the amorphous phase of PEEK. As for the case of polyimides-water systems illustrated before, at low water concentration cross-HB interactions prevail while the water self-HB interactions increase their relative importance as total water concentration increases. Vibrational spectroscopy analysis is in progress in order to provide a quantitative experimental estimate of the amount of each kind of HB interactions to be compared with model predictions.

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Durability of Composites in a Marine Environment by John Summerscales (auth.), Peter Davies, Yapa D.S. Rajapakse (eds.)


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