Yana Wang , Yu Gong , Qin Zhang , Yuhuai He , Jian Jiao , Ning Hu
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引用次数: 3
Abstract
Laminated and 2.5D woven composites are the two main configurations for CFRP used in turbofan engine blades. However, vibration fatigue behaviors of both structures and their differences are still lacking investigation. In this study, resonance fatigue tests based on the first-order cantilever beam bending are performed under eight strain levels on the laminated and 2.5D woven T800/epoxy composites with special angle-interlock architecture. Parameters related to the vibration fatigue behaviors, such as the variations of the normalized resonance frequency with the number of fatigue cycles, the retention rate of the load capacity, and the stiffness of the laminated and 2.5D woven composites are obtained and compared. The mathematical expressions of the ε-N curves for the two materials under the first-order resonant bending fatigue tests are obtained, and the strain limit values of the laminated and 2.5D woven composites that can withstand 107 cycles are estimated to be about 5000 με and 2400 με respectively, which can be used for guiding the design of aeroengine blades. Besides, the damage mechanisms of both materials are revealed by X-ray Micro CT. The main damage mode of the laminated structures is delamination, which is prone to unstable crack propagation. However, the damage propagation within the 2.5D woven structures exhibits multiple paths as a result of the warp yarns interlocked in the thickness direction. By comparing the vibration fatigue behavior and test data of these two materials, it can be concluded that the design limit for the vibration fatigue strain level of the laminated structures is higher than that of woven structures, but the damage resistance of the woven structures is better than laminated structures.
期刊介绍：
Typical subjects discussed in International Journal of Fatigue address:
Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements)
Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading
Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions
Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions)
Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects
Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue
Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation)
Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering
Smart materials and structures that can sense and mitigate fatigue degradation
Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.
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