Study on Fatigue Life of Diaphragm Springs by using Cycle Ratio Modification
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摘要: 基于有限元精确应力结果运用循环系数修正的疲劳积累理论对膜片弹簧寿命分析,并讨论工作位置对寿命影响。对膜片弹簧大端加载有限元分析,验证有限元算法精确性;对膜片弹簧疲劳测试工况应力分析,剔除预紧与松紧过程应力,运用基于应力控制的疲劳损伤理论,并用循环系数修法正对其修,对膜片弹簧疲劳寿命分析。借助Ncode Designlife平台Time Step模块,通过计算方法获得零件疲劳危险点位置,与以往实验一致,且与疲劳测试相符。精度较以往计算有较大提高,且该方法可用于所有周期性工作零件疲劳寿命预测。讨论了工作位置对膜片弹簧影响,当工作位置位于极大值点与拐点之间并尽量远离拐点时,膜片弹簧既能发挥其非线性弹性特性,又能保持较高的疲劳寿命。Abstract: To offer the fundamental of fatigue design of diaphragm spring, the cumulative fatigue damage theory has been used to calculate the fatigue life of diaphragm spring based on the current stress history data, and the impact of working position had been discussed. Loading on large side had been analyzed by using FEM firstly, after that the experimental results have been obtained to verify the FEM calculated results. Secondly the stress data in fatigue test condition had been calculated by using FEM, and the stress data of preloading and unpreloading were removed. With the remaining stress history data, the stress controlled fatigue damage method had been used considering the cycle ratio modification to analyze the fatigue life. To make the process easier Time Step module in Ncode Designlife had been used, the calculated result indicated that the danger point position is same as the previous literature and match with the fatigue test. The calculated accuracy of fatigue damage had been greatly improved, and the danger point position of fatigue damage can be directly calculated, besides, it can not only be used for a diaphragm spring but also for other cyclical working component. At last, the impact of working position had been discussed, which identify that when the working position is between the local maximum value point and the inflection point, and keep a distance to inflection point then a diaphragm spring can behave nonlinear as well as a longer life.
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[1] 林世裕.膜片弹簧与碟形弹簧离合器的设计与制造[M].南京:东南大学出版社,1995 Li S Y. The design and manufacture of diaphragm spring and disk spring clutch[M]. Nanjing:Southeast University Press, 1995 [2] 朱茂桃,夏长高,高翔.膜片弹簧疲劳断裂的试验分析[J].汽车工程,2001,23(2):139-142,120 Zhu M T, Xia C G, Gao X. Mechanics analysis on fatigue crack of diaphragm springs[J]. Automotive Engineering, 2001,23(2):139-142,120 (in Chinese) [3] 夏长高,朱茂桃,高翔.膜片弹簧疲劳断裂的裂纹源探讨[J].农业机械学报,2000,31(5):85-87,128 Xia C G, Zhu M T, Gao X. Study on the original fatigue crackles of a diaphragm spring[J]. Transactions of the Chinese Society of Agricultural Machinery, 2000,31(5):85-87,128 (in Chinese) [4] 高翔.膜片弹簧疲劳强度研究[J].农业机械学报,1997,28(4):107-111 Gao X. Study on fatigue strength of diaphragm spring used in automobile clutch[J]. Transactions of the Chinese Society of Agricultural Machinery, 1997,28(4):107-111 (in Chinese) [5] 高翔.膜片弹簧应力测试研究[J].江苏理工大学学报,1997,18(5):64-68 Gao X. Experimental research on stress of diaphragm spring[J]. Journal of Jiangsu University of Science and Technology, 1997,18(5):64-68 (in Chinese) [6] Nam W H, Lee C Y, Chai Y S, et al. Finite element analysis and optimal design of automobile clutch diaphragm spring[C]//Seoul 2000 FISITA World Automotive Congress. Seoul, Korea:FISITA, 2000 [7] Kaya N. Optimal design of an automotive diaphragm spring with high fatigue resistance[J]. International Journal of Vehicle Design, 2006,40(1-3):126-143 [8] 林恩,桂良进,范子杰.膜片弹簧力学特性有限元分析[J].汽车工程,2010,32(10):892-896 Lin E, Gui L J, Fan Z J. Finite element analysis of the mechanics characteristics of diaphragm spring[J]. Automotive Engineering, 2010,32(10):892-896 (in Chinese) [9] 田杰,张利辉.汽车离合器膜片弹簧的疲劳寿命分析[J].机械工程师,2013,(8):123-125 Tian J, Zhang L H. Fatigue life analysis of automobile clutch diaphragm spring[J]. Mechanical Engineer, 2013,(8):123-125 (in Chinese) [10] 王博.基于有限元法的膜片弹簧特性曲线仿真分析[J].拖拉机与农用运输车,2007,34(1):90-92 Wang B. Emulation analysis of diaphragm spring's characteristic curves based on FEM[J]. Tractor & Farm Transporter, 2007,34(1):90-92 (in Chinese) [11] 杨井银,张铁山.分离指结构对膜片弹簧载荷-变形特性的影响[J].拖拉机与农用运输车,2011,38(2):27-29 Yang J Y, Zhang T S. Fingers structure's effect on load-deformation characteristic for diaphragm spring[J]. Tractor & Farm Transporter, 2011,38(2):27-29 (in Chinese) [12] 袁旦,李芳,郑方赐.基于非线性有限元法的膜片弹簧特性曲线计算[J].浙江工业大学学报,2009,37(3):350-354 Yuan D, Li F, Zheng F C. Calculation for the load-deflection curve of diaphragm springs based on non-linear finite element method[J]. Journal of Zhejiang University of Technology, 2009,37(3):350-354 (in Chinese) [13] Fatemi A, Yang L. Cumulative fatigue damage and life prediction theories:a survey of the state of the art for homogeneous materials[J]. International Journal of Fatigue, 1998,20(1):9-34 [14] Quoc T B, Dubuc J, Bazergui A, et al. Cumulative fatigue damage under stress-controlled conditions[J]. Journal of Fluids Engineering, 1971,93(4):691-698 [15] Biron A, Bui-Quoc T. Cumulative damage concepts with interaction effect consideration for fatigue or creep; a perspective[C]//Transactions of the 6th International Conference on Structural Mechanical Reaction Technology. Paris, France, 1981
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