| 流体动力润滑油膜破裂的热力学失稳机理 |
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| 引用本文： | 张广军 黄平. 流体动力润滑油膜破裂的热力学失稳机理[J]. 应用力学学报, 1999, 16(2): 42-47 |
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| 作者姓名： | 张广军 黄平 |
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| 作者单位： | [1]中国矿业大学 [2]清华大学 |
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| 基金项目： | 国家自然科学基金,煤炭科学基金 |
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| 摘 要： | 分析了流体动力学润滑过程中的热量传递及对润滑剂流变特性的影响，得出了流体动力润滑油膜发生热力学失稳的条件，建立了描述润滑剂温度非牛顿效应的本构方程数值计算结果表明，由于温度的影响，流体动力润滑油膜存在最大承载能力；在临界状态，微小的扰动将会引起油膜失稳而丧失承载能力。初步揭示了流体动力学力润滑膜破失效的内在力学机制。
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| 关 键 词： | 流体动力润滑 失效 热不稳定性 油膜破裂 |
Mechanism of Hydrodynamic Oil Film Failure by Collapse Due to Thermomechanical Instability |
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| Zhang Guangjun Meng Huirong Huang Ping Wen Shizhu. Mechanism of Hydrodynamic Oil Film Failure by Collapse Due to Thermomechanical Instability[J]. Chinese Journal of Applied Mechanics, 1999, 16(2): 42-47 |
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| Authors: | Zhang Guangjun Meng Huirong Huang Ping Wen Shizhu |
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| Affiliation: | Zhang Guangjun Meng Huirong Huang Ping Wen Shizhu (Beijing Graduate School of CUMT 100083) (National Tribology Laboratory of Tsinghua University 100084) Li Guilan (China Coal Research Institute 100013) |
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| Abstract: | The criterion of thermomechanical instability of hydrodynamic oil film is presented by analyzing heat transfer in hydrodynamic lubrication region and the influence of temperature on rheological properties of lubricants. Constitutive equation describing non Newtonian behavior of lubricant caused by thermal effect is founded and coupled with equations of continuity and momentum to calculate the load carrying capacity of hydrodynamic oil film by a new algorithm. Numerical results show that hydrodynamic oil films possess ultimate load carrying capacities due to thermal effect, faint perturbation of load or film thickness would result in films unstable and losing the carrying capacities while hydrodynamic oil films in critical states. Intrinsic mechanical characteristic of film failure by collapse is preliminarily revealed in this paper. |
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| Keywords: | hydrodynamic lubrication failure mechanism collapse thermal instability. |
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