盘用材料缺口特征尺寸对缺口强度的影响

现代航空发动机轮盘工况复杂,常常在榫槽、通气孔、螺栓孔等几何不连续处遭受破坏。这些几何不连续性特征可以视为广义的缺口,为了分析缺口附近几何特征尺寸对航空发动机轮盘复杂结构件抗拉强度的影响规律,基于典型盘用合金GH4169设计了双边缺口平板试样、双边不等缺口平板试样、不等厚双边缺口平板试样以及不等厚双边不等缺口平板试样进行试验研究。试验结果表明:缺口平板试样的应力集中系数与缺口抗拉强度存在一定的相关性,缺口抗拉强度无量纲化常数与应力集中系数的试验数据点存在一定的分布规律,二者的拟合曲线能很好地描述试验结果分布规律。包括GH4169、GH738和TC11合金等常用航空塑性金属材料在内的缺口平板试验数据点落在拟合曲线±10%以内的分散带内。

The Influence of Notch Characteristic Size of Disc Material on Notch Strength

The working condition of modern aeroengine disk was complex,and it was often damaged in the geometric discontinuities such as mortise,vent hole and bolt hole.These geometric discontinuities could be regarded as generalized notches.In order to analyze the influence of the notch geometric characteristic size on the tensile strength of complex structural parts of aeroengine disk,based on the typical disk alloy GH4169,plate samples with double notches,plate samples with two unequal notches,plate samples with two unequal notches and plate samples with two unequal notches were designed for experimental study.The experimental results show that there is a certain correlation between the stress concentration factor and the notched tensile strength of the notched plate specimen,and there is a certain distribution law between the dimensionless constant of the notched tensile strength and the experimental data points of the stress concentration factor,and the fitting curve of the both can well describe the distribution law of the experimental results.The data points of notched plate test including GH4169,GH738 and TC11 alloy are within±10%of the fitting curve.