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| Low Cycle Fatigue Unit Cell Model for Single Crystal Nickel-base Superalloy under Multiaxial Non-proportional Loading |
| DING Zhiping, WANG Tengfei, LI Ming, CHEN Jiping |
| School of Mechanical Engineering, Hunan University of Technology, Zhuzhou 412007 |
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Cite this article:
DING Zhiping WANG Tengfei LI Ming CHEN Jiping. Low Cycle Fatigue Unit Cell Model for Single Crystal Nickel-base Superalloy under Multiaxial Non-proportional Loading. Chin J Mater Res, 2011, 25(5): 455-463.
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Abstract Low cycle fatigue tests of the single crystal nickel-based superalloy DD3 were conducted under multiaxial non-proportional loading at 680 and 850oC respectively. The results show that some factors affect low cycle fatigue life significantly. Based on energy dissipation theory, a low cycle fatigue life prediction model for the single crystal superalloy was proposed by using cyclic plasticity strain energy as a parameter. According to the micro structure feature, a γ/γ two-phase unit cell finite element model was established, and its cyclic stress-strain was simulated. Calculation results of the macro and the micro finite element model, and low cycle fatigue test data at 680 and 850oC were applied to fit the low cycle fatigue life model by multiple linear regression analysis. The results show that the accuracy of the unit cell
model is better than that of the macro model significantly, and all test data of two kinds of temperatures fall into the factor of 1.6 and 2.0 scatter band, respectively.
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Received: 25 May 2011
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| Fund: Supported by National Natural Science Foundation of China No.50875080. |
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