用升降法求95连杆疲劳极限的探讨

Determining the Fatigue Limit of the 95 Connecting Rod by the Up-and-down Method

为了较精确地求出95连杆的疲劳极限,本文将在材料疲劳试验中应用较广的升降法推广应用于连杆,给出了用升降法求构件疲劳极限的基本过程。文中首先选取了试验的控制因素并确定了连杆的控制点(应力被选定为控制应力的点定义为控制点)。然后在四级应力水平下进行了连杆的疲劳试验,并以最大应力幅点的应力为计算应力求出了连杆的疲劳极限。

In this paper, the Up-and-down method, which is used successfully in material fatigue test, is extended and applied to the 95 connecting rod in order to determine its fatigue limit accurately, and the basic process of determining the fatigue limit of the member by the Up-and-down method is given.The paper first chose the governing factor and determined the control point (the point whose stress is selected as governing factor) of the connecting rod. and then the fatigue test was made on four stress levels. The fatigue limit of the connecting rod is more exactly determined with the stress of the greatest-stress-amplitude-point as calculated stress.