基于“骨点”应力法的GH4169合金缺口平板试样蠕变寿命预测  

Creep Life Prediction of GH4169 Alloy Notched Plate Specimens Based on"Skeletal Point"Stress Method

作　　者：王瀚文 刘宇杰[1] Wang Hanwen;Liu Yuje

机构地区：[1]西南交通大学力学与航空航天学院,四川省成都市610000

出　　处：《工程机械》2023年第7期172-178,I0016,共8页Construction Machinery and Equipment

摘　　要：基于“骨点”应力法,对镍基高温合金GH4169缺口平板试样在650℃下的蠕变过程进行模拟,发现在缺口最小横截面内出现明显“骨点”,同时进行寿命预测,预测寿命与试验结果吻合良好。通过有限元模拟探究缺口平板试样的几何尺寸对蠕变寿命的影响,结果表明试样厚度对缺口平板试样的蠕变寿命影响很小,所研究缺口半径和缺口深度范围内缺口平板试样均呈现缺口强化现象,且蠕变寿命随着理论应力集中系数的增大而逐渐增大。相关研究可为工程应用中的结构件的设计做出参考。Based on the"skeletal point"stress method,the creep process of nickel-based superalloy GH4169 notched plate specimens at 650 is simulated,and a significant"skeletal point"appears in the smallest cross-section of the notch,while its life is predicted.The predicted life is in good agreement with the test result.The influence of the geometric dimensions of the notched plate specimen on the creep life is explored through finite element simulation,and the results show that specimen thickness has little effect onthe creep life of the notched plate specimen.The notched plate specimen presents a phenomenon of notch strengthening within the range of studied notch radius and notch depth,and the creep lifegradually increases with the increase of the concentration coefficient of thetheoretical stress.Relevant research can provide a reference for the design of structural components in engineering applications.

关 键 词：GH4169合金 缺口平板 “骨点”应力 缺口强化 蠕变寿命预测 

分 类 号：TG132.3[一般工业技术—材料科学与工程]