Estimation method for fatigue life under multi-axial random loading
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摘要: 提出了一种多轴随机载荷下的疲劳寿命预测方法.通过雨流计数法对各平面上的剪应变进行循环计数,以统计出的剪应变循环作为多轴疲劳损伤的主要控制参数,将各剪应变循环历程内对应的最大正应力和正应变变程作为多轴疲劳损伤的第二控制参数.根据多轴疲劳寿命模型计算出各平面上的损伤,以最大损伤平面作为多轴随机疲劳的临界平面,通过该临界平面上的损伤计算出多轴随机载荷下的疲劳寿命.采用SNCM630钢,304不锈钢和S45C钢3种金属材料的多轴随机疲劳试验数据对提出的寿命预测方法进行评估和验证.结果表明:疲劳寿命预测结果大都分布在试验结果的2倍分散带之内.Abstract: An estimation method for fatigue life under multi-axial random loading was proposed.Firstly the rain-flow counting method was used to identify shear strain cycles on each plane.The shear strain cycles were taken as a main control parameter of multi-axial fatigue damage.Then the maximum normal stress and normal strain range within each shear strain cycle were calculated as the second damage control parameter.The damage of each plane was calculated by multi-axial fatigue life model and the critical plane was identified as the plane with the maximum damage.The fatigue life was determined using the damage associated with the plane.The method for fatigue life under multi-axial random loading was evaluated and validated by the multi-axial random fatigue test datum of SNCM630 steel,304 stainless steel and S45C steel.The multi-axial random fatigue life prediction results of these materials are almost within a factor of two scatter band of the test results.
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Key words:
- life prediction /
- multi-axial fatigue /
- random loading /
- critical plan /
- cycle counting
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[1] Lee B L,Kim K S,Nam K M.Fatigue analysis under variable amplitude loading using an energy parameter[J].International Journal of Fatigue,2003,25(7):621-631. [2] Garud Y S.A new approach to the evaluation of fatigue under multiaxial loadings[J].Journal of Engineering Material and Technology,1981,103(2):118-125. [3] Jordan E H,Brown M W,Miller K J.Fatigue under severe nonproportional loading//Multiaxial Fatigue.San Francisco,CA:American Society for Testing and Materials,1985:569-585. [4] Brown M W,Miller K J.A theory for fatigue failure under multiaxial stress-strain conditions[J]. Proceedings of the Institution of Mechanical Engineers, 1973,187(65):745-755. [5] Varvani-Farahani A.A new energy-critical plane parameter for fatigue life assessment of various metallic materials subjected to in-phase and out-of-phase multiaxial fatigue loading conditions[J].International Journal of Fatigue,2000,22(4):295-305. [6] Kim K S,Park J C,Lee J W.Multiaxial fatigue under variable amplitude loads[J].Journal of Engineering Material and Technology,1999,121(3):286-293. [7] 何国求,陈成澍,高庆,等.不锈钢多轴非比例加载低周疲劳的研究[J].机械工程学报,1999,35(1):47-50. HE Guoqiu,CHEN Chengshu,GAO Qing,et al.Study on multiaxial low cycle fatigue under nonproportional loading of 316L stainless steel[J].Chinese Journal of Mechanical Engineering,1999,35(1):47-50.(in Chinese) [8] Zhang G Q,Pu G Q,Wang C T.Fatigue life prediction of crankshaft made of material 48MnV based on fatigue tests,dynamic simulation and FEA[J].Chinese Journal of Mechanical Engineering,2006,19(2):307-311. [9] Brown M W,Miller K J.High temperature low cycle biaxial fatigue of two steels[J].Fatigue and Fracture of Engineering Materials and Structures,1979,1(2):217-229. [10] Fatemi A,Socie D F.A critical plane approach to multiaxial fatigue damage including out-of-phase loading[J].Fatigue and Fracture of Engineering Materials and Structures,1988,11(3):149-166. [11] 赵勇铭,宋迎东.椭圆方程式的多轴疲劳寿命预测模型[J].机械工程学报,2009,45(11):312-316. ZHAO Yongming,SONG Yingdong.Multi-axial fatigue life prediction model in elliptic equation form[J].Chinese Journal of Mechanical Engineering,2009,45(11):312-316.(in Chinese) [12] 李静,孙强,李春旺,等.一种新的多轴疲劳寿命预测方法[J].机械工程学报,2009,45(9):285-290. LI Jing,SUN Qiang,LI Chunwang,et al.New prediction method for multiaxial fatigue life[J].Chinese Journal of Mechanical Engineering,2009,45(9):285-290.(in Chinese) [13] Kanazawa K,Miller K J,Brown M W.Low cycle fatigue under out-of-phase loading conditions[J].Journal of Engineering Materials and Technology,1977,99(3):222-228. [14] Taira S,Inoue T,Yoshida T.Low cycle fatigue under multiaxial stresses (in the case of combined cyclic tension-compression and cyclic torsion) at room temperature.Kyoto,Japan:The 12th Japan Congress on Materials Research,1969. [15] Socie D F,Wail L E,Kock J L.Biaxial fatigue of inconel 718 including mean stress effects//Multiaxial Fatigue.San Francisco,CA:American Society for Testing and Materials,1985:463-481. [16] Pascoe K J,Devilliers J W R.Low cycle fatigue of steels under biaxial straining[J].Journal of Strain Analysis for Engineering Design,1967,2(2):117-126. [17] Socie D F,Marquis G B.Multiaxial fatigue[M].Warrendale,PA:Society of Automotive Engineers,2000. [18] Krempl E.The influence of state of stress on low-cycle fatigue of structural materials.American Society for Testing and Materials,ASTM STP 549,1974. [19] Shamsaei N,Gladskyi M,Panasovsky K,et al.Multiaxial fatigue of titanium including step loading and load path alteration and sequence effects[J].International Journal of Fatigue,2010,32(11):1862-1874. [20] Kandile F A,Brown M W,Miller K J.Biaxial low cycle fatigue fracture of 316 stainless steel at elevated temperatures[M].London:The Metal Society,1982:203-210. [21] 吴志荣,胡绪腾,宋迎东.基于最大剪应变幅和修正SWT参数的多轴疲劳寿命预测模型[J].机械工程学报,2013,49(2):59-66. WU Zhirong,HU Xuteng,SONG Yingdong.Multi-axial fatigue life prediction model based on maximum shear strain amplitude and modified SWT parameter[J].Chinese Journal of Mechanical Engineering,2013,49(2):59-66.(in Chinese) [22] Han C,Chen X,Kim K S.Evaluation of multiaxial fatigue criteria under irregular loading[J].International Journal of Fatigue,2002,24(9):913-922. [23] Kim K S,Lee B L,Park J C.Biaxial fatigue of stainless steel 304 under irregular loading//Fatigue and Fracture Mechanics.West Conshohocken,PA:American Society for Testing and Materials,2000:79-93. [24] Chen X,Jin D,Kim K S.A weight function-critical plane approach for low-cycle fatigue under variable amplitude multiaxial loading[J].Fatigue and Fracture of Engineering Materials and Structures,2006,29(4):331-339. [25] Kim K S,Park J C.Shear strain based multiaxial fatigue parameters applied to variable amplitude loading[J].International Journal of Fatigue,1999,21(5):475-483.
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