Abstract—

Carbon–carbon composite materials (CCCMs) are used in brake systems and in movable sealing joints, since they can have both frictional and antifriction properties, depending on their structure. In recent studies, data were obtained on the thermal properties of various CCCMs and the coefficient of friction in a pair with various counterbodies as a function of temperature. In this case, the nature of the dependences of the friction coefficient and the coefficient of linear thermal expansion on temperature is similar and has close critical points. The paper investigates the contact interaction of a heated heat-insulated annular punch with a half-space, the thermal expansion coefficient of which depends on temperature. Analytical expressions are obtained for calculation of the contact pressure and the penetration of the punch for various temperature distributions over the contact area. To take into account the uneven heating of the contacting surfaces, the temperature distribution under the annular punch was calculated during its frictional interaction with the elastic half-space. The case of temperature distribution during heating from spinning friction, which is typical for tribological tests and operation of interfaces made of CCCMs, is considered. It is established that in the considered case the temperature increases from the inner radius of the annular punch to the outer one. The joint effect of the ring width and temperature distribution on the value of contact pressures is studied. Calculations show that taking into account frictional heating is more important for narrow punches, while the minimum pressure in the contact area can significantly decrease at a fixed value of the external load.

中文翻译：

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碳-碳复合材料表面热膨胀效应对与环形样品接触相互作用的评估

摘要-

碳-碳复合材料（CCCM）用于制动系统和活动密封接头，因为根据其结构，它们可以同时具有摩擦和减摩性能。在最近的研究中，获得了各种 CCCM 的热性能以及与各种相对体的摩擦系数随温度变化的数据。在这种情况下，摩擦系数和线性热膨胀系数对温度的依赖性的本质是相似的并且具有接近的临界点。本文研究了加热的隔热环形冲头与半空间的接触相互作用，其热膨胀系数取决于温度。获得了解析表达式，用于计算接触区域上各种温度分布的接触压力和冲头的穿透力。为了考虑接触表面的不均匀加热，计算了环形冲头与弹性半空间摩擦相互作用期间的温度分布。考虑了旋转摩擦加热过程中温度分布的情况，这是摩擦学测试和 CCCM 制成的界面操作的典型情况。可以确定的是，在所考虑的情况下，温度从环形冲头的内半径向外半径增加。研究了环宽和温度分布对接触压力值的联合影响。计算表明，考虑摩擦生热对于窄冲头更为重要，而在外部载荷固定值下，接触区域的最小压力会显着降低。