THE INFLUENCE OF TWO-STAGE LOADING ON THE LONGITUDINAL SPLITTING OF UNIDIRECTIONAL CARBON/EPOXY LAMINATES |
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| Authors: | M S Found S B Kanyanga |
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| Affiliation: | SIRIUS, Department of Mechanical and Process Engineering University of Sheffield, Sheffield, U.K.;Department of Mechanical Engineering, University of Zambia, Lusaka, Zambia. |
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| Abstract: | Abstract— A review of variable fatigue loading of carbon fibre/epoxy laminates indicates that for two-stage loading, low-to-high loading is generally more damaging than high-to-low loading. Damage accumulation under two-stage loading appears to produce linear damage in some CFRP materials and non-linear behaviour in others. The behaviour of those materials exhibiting linear damage may be predicted by the Palmgren-Miner rule. A model is presented for determining the longitudinal split growth in notched unidirectional carbon fibre/epoxy test coupons. The model is able to predict the non-linear split growth for low-to-high loading whilst the linear damage accumulation for high-to-low loading may best be determined by use of the Palmgren-Miner rule. |
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| Keywords: | carbon fibre/epoxy laminates two-step loading notched unidirectional composites cumulative damage model |
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