44 research outputs found

    The Static Failure of Adhesively Bonded Metal Laminate Structures: A Cohesive Zone Approach

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    Data on distribution, ecology, biomass, recruitment, growth, mortality and productivity of the West African bloody cockle Anadara senilis were collected at the Banc d'Aguuin, Mauritania, in early 1985 and 1986. Ash-free dry weight appeared to be correlated best with shell height. A. senilis was abundant on the tidal flats of landlocked coastal bays, but nearly absent on the tidal flats bordering the open sea. The average biomass for the entire area of tidal flats was estimated at 5.5 g·m−2 ash-free dry weight. The A. senilis population appeared to consist mainly of 10 to 20-year-old individuals, showing a very slow growth and a production: biomass ratio of about 0.02 y−1. Recruitment appeared negligible and mortality was estimated to be about 10% per year. Oystercatchers (Haematopus ostralegus), the gastropod Cymbium cymbium and unknown fish species were responsible for a large share of this. The distinction of annual growth marks permitted the assessment of year-class strength, which appeared to be correlated with the average discharge of the river Senegal. This may be explained by assuming that year-class strength and river discharge both are correlated with rainfall at the Banc d'Arguin.

    Délaminage mode 1 et Il de composites a renfort tissu sollicites a faibles et grandes vitesses

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    The influence of the loading rate on delamination of Mode I and Mode II of two composites materials with woven glass reinforcements provided by VETROTEX company has been studied. These composites differ according to the nature of their resins, the DERAKANE 8084.05 being more soft than the DERAKANE 470.36 which is considered as rigid. The ductile nature of the resine provides an improvement in the crack initiation and propagation energies for small and high rates loading. This study has permitted the introduction of the interesting notion of the role of interfaces for the woven reinforcements. It also demonstrates the existence of a correlation between the behavior of each of these interfaces and the change of propagation and delamination energies for Mode I and II

    Progressive Failure Analysis of Composite Pi Joint

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