机械设计基础-第二章---摩擦磨损润滑.pptVIP

* 3、弹性液体动压润滑 在点、线接触摩擦副的液体动压润滑中考虑 接触表面弹性变形 压力对黏度的影响 6.1 液体润滑 * 二、边界润滑 特点见前述“边界摩擦”。 三、混合润滑 特点见前述“混合摩擦”。 6.2/3 边界润滑和混合润滑 * 工况条件变化，表面状态变化将出现不同的摩擦状态，即发生边界摩擦、混合摩擦和流体摩擦之间的转化，实际工况下经常几种润滑状态同时存在。 6.4 润滑状态的转换 摩擦特性曲线 润滑状态转换曲线 Sribeck曲线 摩擦系数μ 润滑油黏度? 相对滑动速度U 载荷W * 本章结束 * 1－运动件 2－封油面 3－油腔 4－承导件 5－补偿元件 6－液压泵 相对滑动速度对摩擦系数的影响 低速阶段，a+bvs项占主导，随vs的增大，f 增大；随后指数项占主导， f 随vs的进一步增大而减小。 低、中速下，摩擦阻力引起的发热是一种暂时和局部现象，对总的摩擦机理不产生大的影响 很高的速度下，金属受强烈的摩擦热，大大改变了表面接触层的状态，表面可发生广泛的塑性流动，甚至大规模的熔化。 GNP国民生产总值 GDP国内生产总值 * * Scuffing, unlike normal wear, has a unique feature. It may occur suddenly and at an unexpected time. We have an ambition, a dream to reveal the secret of scuffing, and to understand the driving force that leads to the catastrophic failure. As the first effort of modeling, lubricated sliding is considered as a dynamic process that may either converge to a smooth running-in, or go to a catastrophic failure. * Scuffing, unlike normal wear, has a unique feature. It may occur suddenly and at an unexpected time. We have an ambition, a dream to reveal the secret of scuffing, and to understand the driving force that leads to the catastrophic failure. As the first effort of modeling, lubricated sliding is considered as a dynamic process that may either converge to a smooth running-in, or go to a catastrophic failure. * Scuffing, unlike normal wear, has a unique feature. It may occur suddenly and at an unexpected time. We have an ambition, a dream to reveal the secret of scuffing, and to understand the driving force that leads to the catastrophic failure. As the first effort of modeling, lubricated sliding is considered as a dynamic process that may either converge to a smooth running-in, or go to a catastrophic failure. * Scuffing, unlike normal wear, has a unique feature. It may occur suddenly and at an unexpected time. We have an ambition, a dream to reveal the secret of scuffing, and to understand the driving force that leads to the catastrophic failure. As the first