复合材料高低周复合疲劳试验技术

In order to research the combined cycle fatigue properties of composite, this paper comprehensively analyzes the existing design ideas and research progress of existing combined cycle fatigue test platforms, aiming to building a combined cycle fatigue test platform for composite materials. Based on the fatigue failure mode of composite, the 2D braided composite specimen is designed as the asymmetric dumbbell shape for the fatigue test. The test result shows that failure occurred in the fatigue assessment area of the specimen. The strain curve of the failure site shows the characteristics of low frequency and high amplitude caused by low cycle fatigue load, and the characteristics of high frequency and low amplitude caused by high cycle fatigue load. The completion of fatigue test demonstrates a test method for the research of combined cycle fatigue test of composite materials.