Influence of laser treatment on the fatigue of notched bar

激光处理对切口棒料疲劳性能的影响(英文)

Fatigue cutting is a new approach for separating material. Man-made fatigue can be realized by applying a rotating bending load to a notched bar. To better utilize the new method, laser treatment is adopted in this study. After laser radiation at the notch root, the fatigue cycle of the bar drops dramatically. Based on the experimental result, we draw the conclusion that the fatigue of the bar is influenced by the shape of the hardened area. A hardened area that has a small axial dimension and a relatively large radial dimension facilitates the fatigue. The desirable hardened area can be obtained by controlling the laser treatment parameters.

疲劳断料是一种新的分离材料方法 .通过对棒料进行切口并施加旋弯载荷 ,可人为制造疲劳 .为了进一步提高断裂的效率 ,采用激光对棒料切口的根部进行了处理 ,处理后的棒料疲劳周次大大降低 .通过分析实验结果得到 :棒料的疲劳受硬化区形状影响 ,具有较小轴向尺寸和较大径向尺寸的硬化区会促进疲劳 .硬化区的形状可以通过调整激光处理参数来控制 .