The effect of temperature on fatigue damage of FRP composites.pdf - J Mater Sci(2010 45:3757–3767 DOI 10.1007/s10853-010-4425-4 The effect of

The effect of temperature on fatigue damage of FRP composites.pdf

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The effect of temperature on fatigue damage of FRP composites H. Mivehchi A. Varvani-Farahani Received: 19 November 2009 / Accepted: 17 March 2010 / Published online: 2 April 2010 Ó Springer Science+Business Media, LLC 2010 Abstract The present study intends to investigate the effect of temperature on cumulative fatigue damage ( D ) of laminated fibre-reinforced polymer (FRP) composites. The effect of temperature on fatigue damage is formulated based on Ramkrishnan–Jayaraman and Varvani-Farahani– Shirazi residual stiffness fatigue damage models. The models are further developed to assess the fatigue damage of FRP composites at various temperatures ( T ). This task is fulfilled by formulating the temperature dependency of Young’s modulus ( E ) and ultimate tensile strength ( r ult ) as the inputs of the models. Temperature-dependant parame- ters of Young’s modulus and ultimate tensile strength are found to be in good agreement with the experimentally obtained data when used for unidirectional, cross-ply and quasi-isotropic FRP laminates. The proposed fatigue damage model is evaluated using six sets of fatigue damage data. The proposed temperature-dependent model was also found promising to predict the fatigue damage of unidi- rectional (UD) and orthogonal woven FRP composites at different temperatures. Introduction The major fatigue models and life time methodologies for fibre-reinforced polymer (FRP) composites are classified into three categories: (i) fatigue life models, which do not take into account the actual degradation mechanisms, such as matrix cracks and fibre fracture, but use S N curves or Goodman-type diagrams and introduce some fatigue failure criteria [ 1 4 ], (ii) phenomenological models for residual stiffness/strength [ 1 , 5 8 ] and (iii) progressive damage models which analyze the fatigue damage based on some measurable damage variables such as transverse matrix cracks and delamination size [ 1 , 9 11 ]. The fatigue damage model employed in this study is constructed based on stiffness degradation of materials over life cycles. Stiffness degradation damage models [ 5 7 ] are reliable approaches relating damage progress of FRP composite material properties, including the properties of the matrix, fibre and fibre–matrix interface as the number of stress cycles progresses. Ramkrishnan–Jayaraman and Varvani-Farahani–Shirazi damage models [ 5 , 6 ] are used as the backbone of analysis in this paper. Mechanical prop- erties of FRP composite laminates including their micro- constituents are further formulated as a function of operating temperatures. Temperature-dependent parameters of Young’s modulus and ultimate tensile strength as inputs of the damage model characterize the damage of FRP composite specimens at various operating temperatures.
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