利用红外热像技术快速预测材料的S-N曲线

研究材料疲劳一般采用试验的方法,但试验周期长, 所需试验试件和费用多,一直以来都是材料疲劳试验难以克服的困难,人们一直在探寻能快速得到材料疲劳性能的方法.本文在前人研究的基础上,采用红外热像技术,确定了材料的疲劳极限,并在"同种试件疲劳破坏消耗的塑性功不变"的假设下,通过建立塑性温升、热耗散、塑性功之间的关系给出了试件疲劳寿命的计算公式.由此经过简单的试验,理论上用一根试件,试验几个小时就可以快速确定材料的疲劳寿命,给出材料的S-N曲线.

On the Use of Infrared Thermography Method for Material S-N Curve Prediction

It is a general way to study material fatigue by fatigue test. An unsolved problem for fatigue test is long-term experiments, huge amounts of specimen and high cost. People are always seeking for a rapid method to obtain material fatigue properties. On the basis of predecessor's studies, the fatigue limit was established by using infrared thermographic method in this paper. Moreover, on the assumption that "a specific specimen depletes the same energy of plastic deformation", fatigue life equation was obtained by constructing the relationship among plastic temperature rise, heat dissipation and plastic work. Thus, material fatigue life and S-N curve can be theoretically determined by a simple experiment, which needs only one specimen and several hours.