针对于工程机械产品钢制液压管件的疲劳失效问题，需要对其复杂的受力情况进行研究分析。采用台架载荷标定试验分析油缸直角弯管受力情况，通过应变片组桥方式滤去温度对应变的影响，把直角弯管的外部承载力等效为空间三向力系和管压作用力，最后对测量结果进行多元线性回归分析，得到载荷输入与应变输出关系方程。把实际工况液压管件的实测应变谱转化为输入载荷大小，最终获得测量截面在实际工作过程中的受力情况。为液压管件的有限元分析、寿命估算和可靠性设计提供真实可靠的承载条件或边界条件。
For the increasing problems of hydraulic pipeline fittings fatigue failure of construction machinery product, it's quite necessary to analyze the complicated force load of hydraulic pipeline fittings. The load calibration test has been used to analyze the force load of hydraulic pipeline fittings, by using of strain gauge bridge combination, the effect of temperature on strain can be eliminated, and it's achievable that the external force of right-angle elbow can be represented by one space triaxial force and one pipe pressure force. All the force load measurements of right-angle elbow have been analyzed by multiple linear regression analysis, and the relation equations between input load and output strain had been gained, which can transform strain spectrum on actual working condition into load force, and finally obtain the actual force load of test sample, that can provide real and reliable load spectrum or boundary conditions for FEA, fatigue life estimation, and reliability designs of hydraulic pipeline fittings.
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