轻合金自冲铆微动磨损及疲劳性能研究

发布时间：2018-08-18 14:59

【摘要】：选择4组轻合金自冲铆进行疲劳实验,用扫描电子显微镜和能谱仪对其断口进行微动磨损机理分析,并系统地研究了接头疲劳寿命和失效形式的影响因素。结果表明,下板与钉腿区的微动磨损是导致下板沿纽扣断裂和铆钉断裂的主要原因,两板间的微动磨损是导致上板靠钉头断裂的主要原因;微动磨屑主要成分为金属板材氧化物,并对微动磨损起缓冲作用。增加板厚可提高接头疲劳寿命,且疲劳载荷较大时寿命提高更为显著;增加板强可提高接头疲劳寿命,且寿命提高程度受疲劳载荷影响较小。增加板厚使失效形式从上板断裂变为下板断裂,增加板强使失效形式从板材断裂变为铆钉断裂。
[Abstract]:Four groups of light alloy self-impact riveting were selected for fatigue test. The fretting wear mechanism of the fracture surface was analyzed by scanning electron microscope and energy spectrometer, and the influence factors of fatigue life and failure form of joint were systematically studied. The results show that the fretting wear between the lower plate and the nail leg is the main reason leading to the fracture of the lower plate along the button and the rivet, and the fretting wear between the two plates is the main cause of the fracture of the upper plate on the nail head. The main component of fretting debris is metal plate oxide, and it can buffer fretting wear. The fatigue life of the joint can be increased by increasing the plate thickness, and the fatigue life of the joint is increased when the fatigue load is larger, and the fatigue life of the joint can be increased by the increase of the plate strength, and the increase of the fatigue life is less affected by the fatigue load. Increasing the thickness of the plate causes the failure form from the upper plate fracture to the lower plate fracture, and the increase of the plate strength causes the failure form from the plate fracture to the rivet fracture.
【作者单位】：昆明理工大学机电工程学院;
【基金】：国家留学基金委(201500090194) 国家自然科学基金(51565023;51565022) 2015年云南省博士研究生学术新人基金(2013603001)
【分类号】：TG115.57

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