Mechanical Property Degradation of Naval Composite Materials |
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Authors: | A P Mouritz S Feih Z Mathys A G Gibson |
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Affiliation: | (1) RMIT University, Melbourne, Australia;(2) Defence Science & Technology Organisation, Melbourne, Australia;(3) University of Newcastle-Upon-Tyne, Newcastle, UK |
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Abstract: | The effect of heat and fire on the mechanical properties and failure of polymer composite materials used in naval ship structures
is investigated. Coupled thermal-mechanical models are presented for predicting the loss in strength and failure of load-bearing
polymer laminates when heated from one-side. The thermal component of the models predicts the temperature and decomposition
rate of a laminate. Using this information, several mechanical models based on progressive softening analysis or laminate
analysis can be used to predict the reduction in strength and time-to-failure. A coupled thermal-mechanical model that is
solved using finite element analysis is also presented. Experimental fire-under-load tests are performed on several types
of polymer laminate materials to evaluate the accuracy of the models. The tests were performed at different heat flux levels
between 10 kW/m2 and 75 kW/m2, which is equivalent to surface temperatures between about 250°C and 700°C. The temperature, mass loss and char formation
of a laminate can be accurately predicted for a wide range of thermal conditions using the models. The models can also predict
the time-to-failure of laminates under static tension or compression loading. The models presented in this chapter are considered
useful analytical tools for naval architects to estimate the loss in mechanical performance and time-to-failure of composite
ship materials in fire. |
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