一种镍基单晶合金多轴低周疲劳损伤参量
A multiaxial Low Cycle Fatigue Damage Parameter for Single Crystal Nickel-Based Superalloys
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摘要: 用损伤应变能释放率作为热力学广义力描述正交各向异性材料的疲劳损伤过程,定义了含有3个弹性常数的镍基单晶应力三轴性因子,它不仅反映多轴载荷下的复杂应力状态,还显示正交各向异性材料偏轴受载时存在的正应力与剪应力的耦合效应,是对各向同性材料应力三轴性因子的拓展。用镍基单晶应力三轴性因子修正Mises应变范围作为疲劳损伤参量,引入损伤驱动力循环特征参数反映循环载荷的交变特性,提出了单晶合金低周疲劳损伤模型。利用DD3和CMSX-2单晶合金低周疲劳试验数据,采用多元线性回归分析方法拟合疲劳损伤模型参数,试验所得数据都落在2倍和2.5倍偏差分布带内。Abstract: Strain energy release ratio,being known as thermodynamics generalized force,was applied to describe fatigue damage course of orthotropy materials.From the definition of strain energy release ratio,a triaxiality factor for single crystal superalloy that contains three elastic constants was defined.Not only may the triaxiality factor show the multiaxial complex stress states as well as the coupling effect of the tensile and torsional stress in orthotropy material while the applied loading deflects from the principal axes directions of material coordinate system.It is a prolongation for triaxiality factor of isotropy material.By using the triaxiality factor to modify strain range as a failure parameter and introducing a cyclic characteristic parameter for damage force to take account of alternately changed characteristic of cyclic loading,a low cycle fatigue damage model for single crystal superalloy was proposed.The low cycle fatigue test data correlation to DD3 and CMSX-2 single crystal superalloy with the parameter by using multivariate linear regression analysis is good and the all test data fall into the factor of 2.0 and 2.5 scatter band respectively.
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[1] Li S X,Smith D J.High Temperature Fatigue-Creep Behaviour of Single Crystal SRR99 Nickel Base Superalloys:Part Ⅱ-Fatigue-Creep Life Behaviour[J].Fatigue Fract.Engng Mater,1995,18,(5):631~643. [2] Mitsuru Kanja,Masao Sakane,Masateru Ohnami.High Temperature Multiaxial Low Cycle Fatigue of CMSX-2 Ni-Base Single Crystal Superalloy[J].ASME Journal of Engineering Materials and Technolog y,1997,119:153~160. [3] Swanson G R,Arakere N K.Effect of Crystal Orientation on Analysis of Single-Crystal Nickel-Based Turbine Blade Superalloys[R].NTIS N20000037784/XAB,2000,2,78. [4] 岳珠峰,吕震宙.复杂应力状态下镍基单晶合金低周疲劳寿命预测模型[J].稀有金属材料工程,2000,29(1):28~31.Yue Zhufeng,Lu Zhenzhou.A Model of Multiaxial Low Cycle Fatigue Life Time of a Nickel-Based Single Crystal[J].Rare Metal Material and Engineering,2000,29(1):28~ 31. [5] 岳珠峰,陶仙德,尹泽勇,杨治国.一种镍基单晶超合金高温低周疲劳的晶体取向相关性模型[J].应用数学和力学,2000,21(4):373~381.Yue Zhufeng,Tao Xiande,Yin Zeyong,Yang Zhiguo.A Crystallographic Model for the Orientation Dependence of Low Cycle Fatigue Property of a Nickel-based Single Crystal Superalloy[J].Applied Mathematics and Mechanics,2000,21(4):373~381. [6] 岳珠峰,杨治国,尹泽勇,魏鹏义,成晓明.单晶涡轮叶片材料本构模型及应用研究[J].燃气涡轮试验与研究,2003,16(1),50~56.Yue Zhufeng,Yang Zhiguo,Yin Zeyong,Wei Pengyi,Cheng Xiaoming.ConstitLntive Relationship of Nickel7 Base Single Crystal Superalloys and Applications[J].Experiment and Study of Gas Turbine,2003,16(1),50~56. [7] Mac Lachlan D W,Knowles D M.Fatigue Behaviour and Lifing of Two Single Crystal Superalloys[J].Fatigue Fract Enging Mater Struct,2001,124:503~521. [8] 王纪安,于永泗.循环频率对CMX-3单晶合金高温疲劳行为的影响[J].宇航材料工艺,2001,2:56~58.Wang Jian,Yu Yongsi,Zrnik J.Effect of Cyclic Frequency on High Temperature Fatigue Behaviour of CMSX-3 NickelBased Single Crystal Superalloy[J].Aerospace Materials and Technology,2001,2:56~58. [9] 李灏.损伤力学基础[M].济南:山东科学技术出版社,1992. [10] Jean Lemaitre.A Continuous Damage Mechanics Model for Ductile Fracture[J].Journal of Engineering Materials and Technology,1985,107:83 ~ 89. [11] 张行,赵军.金属构件应用疲劳损伤力学[M].北京:国防工业出版社,1998.
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