【作者】 郭爱民； 熊峻江；

【Author】 GUO Aimin, XIONG Junjiang Aircraft Design Bureau, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

【机构】 北京航空航天大学飞机设计所；

【摘要】 以曲线拟合为基础,提出了测定疲劳裂纹扩展速率的da/dN精确微分法。经过大量的数据处理发现,使用该方法得到的da/dN数据具有分散性小,精确度高的特点,能够反映da/dN随ΔK的增加而递增的规律。最后,给出了应用实例,并对精确微分法和割线法进行了对比。更多还原

【Abstract】 According to the a-N curves fitted accurately, a new accurate differential method to deal with treat the fatigue crack growth rate da/dN is proposed. From the great deal of application examples, it is found that using this method, the fatigue crack growth rate da/dN has higher accuracy and smaller scatter, and may reflect the law that the fatigue crack growth rate varies with the stress intensity factor ΔK. At last, an example is given and the secant method is compared with the accurate differential method.更多还原