双轴等拉低周疲劳实验装置

本文给出能在一般单向加载液压疲劳试验机上做双轴等拉低周疲劳实验研究的双向拉伸装置,并对有关影响因素进行了讨论。 本试验是在百吨液压低周疲劳试验机上进行的。双向拉体装置已经受近百万次疲劳载荷,其中交变载荷幅围5.5,t亦经受近20万次。在使用过程,各构件完好合手使用要求,将十字试样进行低周疲劳断裂试验,成功地开出合格裂纹,用它进行超速条件下叶轮材料性能研究亦取得初步结果。可以认为它适用于平而应力集中问题低周疲劳性能的研究。若使用液压高、中周疲劳试验机,它还可用于双轴载荷下裂纹试样裂纹扩展的研究。 本文指出了双向拉伸装置有待改进的方面。

Low Cycle Fatigue Tests Under Biaxial Loading

The biaxial tension device is presented which can research the eq-uibiaxial tension low cycle fatigue tests with uniaxial hydraulic fatigue testing machine and reference influencing factors are dicussedThe tests make use of the low cycle fatigue test machine of loot. The device has been sustained fatigue loading about one million times concluding subjected alternative load amplitude of 5.5t about two hundred thousands times. These components which are assemblies of the device are good in use and suitable for requirement.The cruciform sp-"ecimens for biaxial fatigue tests has been cracked successfully in internal hole. The primary results are obtained on the device to study impeller material properties under the condition of super velocity. The device is suitable to studying the low fatigue properties under concentration of plane stress. It is used to study the fatigue crack gr-owth under biaxial load when it make use of high and intermediate cycle fatigue hydraulic fatigue testing machine.This paper pointed out that the device will requirefurther improvement.