【摘要】 焊接构件的低温P S N曲线是冬季构件抗疲劳设计的基础 .在PLG 3 0 0kN高频疲劳试验机上 ,测定了在 - 2 5℃环境下 4种应力水平对应的焊接构件的疲劳寿命 ,并得出了其中值S N曲线 .采用小样本实验的单侧容限分析方法 ,利用对数疲劳寿命变异系数的经验取值 ,得出了焊接构件的低温P S N曲线 .这种方法既简便又经济 ,但需要由进一步的实验来完善 .更多还原

【Abstract】 The P S N curve of fatigue at low temperatures is the design basis against fatigue of welded components in winter. The fatigue life of welded components at -25℃ temperature was measured on PLG 300 kN high frequency fatigue testing machine at four stress levels, and the S N curve of welded components was derived. The P S N curve of fatigue at low temperatures was theoretically obtained by using the method of single side tolerance analysis of small number specimen experiments and the experiential C V value of logarithmic fatigue life(lg? N ) of welded components. This method is a simple and economic one, but its perfection needs more experimental data.更多还原