几何参数对涡轮榫连接微动疲劳寿命的影响：试验

Test and simulation studies were conducted to investigate the fretting fatigue behaviour and damage characterization of turbine attachment. Seven types of turbine attachment with different pressure angles, tooth angles, and tooth spacing were designed, and fatigue tests were carried out under high and low cycle loads. The second tooth of the tenon of all types suffered fretting fatigue failure. And the effect of the geometric parameters of the tenon on fretting fatigue was obtained: with the increase of pressure angle and tooth pitch, the fretting fatigue life gradually decreased; while with the increase of tooth shape angle, the fretting fatigue life was first kept basically the same, and then increased significantly. Critical evidence was provided to reveal the failure mechanism under combined high and low cycle loads, meanwhile important data were generated for determining the controlling parameter and validating the established model of the fretting fatigue for turbine tenons.