Abstract
A set of experimental method is proposed for the out-of-plane shear fatigue performance and damage mechanisms of a type of three-dimensional (3D) woven composites. The S-N curves based on the ultimate failure cycles and the shear fatigue stiffness degradation curve of specimens are obtained. Simultaneously, the relation between the system stiffness degradation and the specimen temperature increase is discussed. Moreover, the damage evolution is captured and analyzed. Microscopic observation of the damage zone on the specimen surface is carried out. Based on the images of infrared thermography and the corresponding crack distribution, the mechanism of heat generation are discussed. It can be found that the temperature distribution of the specimen is positively correlated with the shear strain distribution and crack distribution. The stiffnesses and temperature changes of the specimen show certain consistency. The out-of-plane failure mechanisms under shear fatigue loading for 3D woven composites are revealed on the basis of observation and analysis.
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