Notch sensitivity of multidirectional carbon fibre-reinforced polyimides in fatigue loading as a function of stress ratio |
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| Affiliation: | 1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China;2. Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, College of Chemical and Materials Engineering, Xuchang University, Xuchang 461000, China |
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| Abstract: | Multidirectional laminates of carbon fibre-reinforced bismaleinimide with a central hole as a notch were examined in a fatigue loading test using various stress ratios (R). In the case of R= −1, an increase in the number of load cycles was found to diminish the notch influence on fatigue strength. At R = 0.1 no complete failure was observed when the maximum stress was less than or equal to the static tensile strength up to a load cycle range of 2 × 106. Damage observed that would affect mechanical behaviour in fatigue loading by a faster decrease of notch sensitivity was more pronounced than in that reported for notched multidirectional carbon fibre-reinforced epoxy resin specimens. |
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