磨损加疲劳载荷下的协同疲劳行为
发布时间：2018-10-24 17:41
【摘要】：自行研制的摩擦磨损装置与轴向疲劳试验机相互配合,实现GDL-1钢试样在疲劳应力(240~280 MPa)及接触载荷(30 N)作用下摩擦磨损疲劳试验.通过对磨损层厚度的分析,研究试样承受摩擦磨损载荷及拉压疲劳载荷双重作用下的疲劳寿命变化,用SEM扫描电镜观察分析次表层内疲劳裂纹扩展的演变过程,并采用Hertz线弹性理论和Smith接触理论计算分析摩擦表面以下切应力值.结果表明:在磨损疲劳载荷作用下,形变层的流变作用将显著影响疲劳小裂纹扩展方向,渐趋于切应力方向,从而提高试样疲劳寿命.在此基础上,建立了在摩擦磨损疲劳载荷下疲劳裂纹扩展模型.此外,计算可知在距表层深度0.03 mm处切应力最大,0.18 mm以内材料产生塑性变形,导致形变层的形成.
[Abstract]:The friction and wear device developed by ourselves and the axial fatigue testing machine cooperate to realize the friction and wear fatigue test of GDL-1 steel specimen under the action of fatigue stress (240 ~ 280 MPa) and contact load (30 N). Based on the analysis of the thickness of the wear layer, the fatigue life of the specimen subjected to both friction and wear loads and tensile and compressive fatigue loads is studied. The evolution process of fatigue crack propagation in the subsurface layer is observed by SEM scanning electron microscope. Hertz linear elastic theory and Smith contact theory are used to calculate and analyze the shear stress below friction surface. The results show that under the action of wear fatigue load, the rheological effect of the deformed layer will significantly affect the direction of fatigue crack propagation and gradually tend to the direction of shear stress, thus improving the fatigue life of the specimen. On this basis, the fatigue crack growth model under friction and wear fatigue load is established. In addition, the maximum shear stress is found at the depth of 0.03 mm from the surface layer, and the plastic deformation occurs within 0.18 mm, resulting in the formation of the deformation layer.
【作者单位】： 贵州大学材料科学与冶金工程学院;贵州省材料结构与强度重点实验室;
【基金】：科技部科技创新项目(04C26215200858)资助~~
【分类号】：TG115.5
[Abstract]:The friction and wear device developed by ourselves and the axial fatigue testing machine cooperate to realize the friction and wear fatigue test of GDL-1 steel specimen under the action of fatigue stress (240 ~ 280 MPa) and contact load (30 N). Based on the analysis of the thickness of the wear layer, the fatigue life of the specimen subjected to both friction and wear loads and tensile and compressive fatigue loads is studied. The evolution process of fatigue crack propagation in the subsurface layer is observed by SEM scanning electron microscope. Hertz linear elastic theory and Smith contact theory are used to calculate and analyze the shear stress below friction surface. The results show that under the action of wear fatigue load, the rheological effect of the deformed layer will significantly affect the direction of fatigue crack propagation and gradually tend to the direction of shear stress, thus improving the fatigue life of the specimen. On this basis, the fatigue crack growth model under friction and wear fatigue load is established. In addition, the maximum shear stress is found at the depth of 0.03 mm from the surface layer, and the plastic deformation occurs within 0.18 mm, resulting in the formation of the deformation layer.
【作者单位】： 贵州大学材料科学与冶金工程学院;贵州省材料结构与强度重点实验室;
【基金】：科技部科技创新项目(04C26215200858)资助~~
【分类号】：TG115.5
【参考文献】
相关期刊论文 前2条
1 梁益龙;汪航;谭起兵;李光新;刘海鹂;;GDL-1钢表面摩擦磨损及其干扰层对疲劳寿命的影响[J];钢铁;2008年11期
2 梁益龙,雷e，
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