CFRP超高周三点弯曲疲劳热效应特性实验与数值模拟

针对复合材料超高周三点弯曲疲劳的温升问题，利用商用软件ABAQUS对实验过程中的热效应进行建模与数值模拟研究，得出了疲劳载荷作用下CFRP试样的主体产热阶段与位置，并根据冷却方案设定的基本原则，利用复合冷却方式开展了连续载荷作用下的超声疲劳试验，研究结果表明：CFRP不存在传统的疲劳极限。随着应力水平的改变，CFRP超高周三点弯曲疲劳破坏存在损伤竞争机制，低应力水平下损伤形貌主要以孔蚀形貌为主，高应力水平下主要以分层以及横向裂纹损伤形貌为主。

Experimental and Numerical Simulation Research on the Thermal Effect of CFRP Ultra-High Three-Point Bending Fatigue

In view of the rise of temperature, and being bending fatigue to the composite material under ultra-high three-point, this paper utilizes the commercial software ABAQUS for modeling and simulating the thermal effect in the experimental process, and the main heat generation stage and position of CFRP specimen under fatigue load are obtained, The ultrasonic fatigue test under continuous load is carried out by using composite cooling method. The results show that there is no traditional fatigue limit for CFRP. With the change of stress level, there is a damage competition mechanism in the ultra-high three-point bending fatigue failure of CFRP. The main damage morphology is a pit corrosion at low stress level, and delamination and transverse crack at high stress level.