航空发动机涡轮盘用GH4133B合金常温力学性能统计分析

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The reliability and stability of materials is the base for the structural safety assessment.The mechanical property parameters of GH4133B superalloy used in turbine disk of a type of aero-engine are measured at ambient temperature,and analyzed by using the statistical analysis technique.The mechanical property parameters,such as tensile strength,yield strength,percentage elongation,reduction of cross-section area,Brinell hardness and impact toughness,are statistically analyzed by using the normal probability density function,and D＇Agostino test procedure is adopted to detect the statistical results.The mean-range chart is introduced to examine the periodical stability of GH4133B at different test stages.The global stability and reliability of mechanical property parameters of GH4133B are investigated by using Weibull distribution model.The results demonstrate that the mechanical parameters of GH4133B,whose values possess the property of periodical stability,are fitted with the normal probability density function approximately.The three-parameter Weibull distribution is fit for the reliability assessment of GH4133B.The global stability and reliability of GH4133B all meet the requirements of practical service and application.材料的可靠性和稳定性是结构安全性评估的基础。针对某型航空发动机涡轮盘用GH4133B合金,对其常温力学性能参数进行测试和统计分析。对GH4133B合金的抗拉强度、屈服强度、伸长率、断面收缩率、布氏硬度以及冲击韧度进行正态分布分析,并采用D检验法进行检验,然后应用平均数全距控制图方法,检测不同测试时间段GH4133B合金力学性能参数的稳定性,最后分别利用双参数Weibull统计分析法和三参数Weibull统计分析法,考察GH4133B合金力学性能的整体稳定性和可靠性。统计分析结果表明,GH4133B合金力学性能参数基本符合正态分布,且具有周期稳定特性。对于GH4133B合金的可靠性评估,宜采用三参数Weibull分布。GH4133B合金的整体稳定性和可靠性均符合使役要求。