基于全周期分段步加的极小子样加速实验方法

Extreme-small-sample accelerated test method based on segmentedsection step-stress experimental principle in life cycle

针对滚动功能部件在其使用过程中的磨损失效等将直接影响其服役性能的问题,为方便高效地获得滚动功能部件不同时间历程下的在线监测和离线状态数据,提出了一种基于全周期分段步加策略的极小子样滚动功能部件加速实验方法.将滚动功能部件沿轴线方向分成n+1个子段,从子段1开始在加载力Fi作用下以速度vi自子段i至子段n往复跑合zi次,建立了各分段的等效加载力、等效跑合速度、第i个子段单位长度上正常应力水平下总的服役时间Ti的计算模型,并搭建了滚动功能部件服役性能加速实验台.该加速实验方法可应用于细长轴类零件的服役性能和失效演变机理分析及其寿命和可靠性的预测评估.

The wear failure of rolling-function components significantly affects its service performance.To efficiently obtain a variety of on-line monitoring and off-line testing data over the whole service lifecycle of rolling-function components in a short time,an extreme-small-sample accelerated test method was proposed based on segmented-section step-stress experimental principle in the life cycle for rolling-function components.The sample was segmented into n＋1sections along the axis direction.Begin with section 1,zitimes of reciprocating running-in experiments were performed from section i to section nat the speed viunder the loading force Fi.The calculation model of the equivalent loading force and speed and the total service time Tiunder the normal stress level for the unit length of the ith section were established.And the acceleration test bench for ball screw and linear guide way was set up.This accelerated experiment method can be applied on the slender shaft parts to analyze the service performance and invalidation or predict and evaluate their life and reliability.