碳纤维增强复合材料的动静摩擦转变研究

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Tribological tests were conducted on carbon fabric/epoxy composites and 45 steel at low velocity, and the in- fluences of sliding velocity, normal load, materials composition on static friction coefficient, kinetic friction coefficient and transition behaviour from static to kinetic friction were investigated. The results show that static friction coefficient is raised first, then decreased as normal load is increased, and the difference between kinetic friction coefficient and static friction coefficient is small, the smallest difference is 0. 004, when the weight ratio of MoS2 to graphite is 2 ： 3 ; Velocity dominates static friction coefficient when the weight ratio of MoS2 to graphite is 2 ： 7. At low speed level, the difference between kinetic friction coefficient and static friction coefficient is decreased first, and then raised along with the increasing of normal load, stick-slip occurrs when the difference is too large.在改造的摩擦试验机上，研究低速条件下，碳纤维织物／环氧树脂复合材料与45°钢干摩擦时，速度、压力、润滑组分等对其动静摩擦特性转变过程的影响。结果表明：石墨和MoS2比值为2：3时，碳纤维织物／环氧树脂复合材料的静摩擦因数随着压力的增大先增大后减小，且动静摩擦因数之差较小，最小为0．004，；石墨和MoS2比值为2：7时，速度对静摩擦因数的影响作用处支配地位。在低速下，动静摩擦因数之差随着压力的增大先减小后增大，而动、静摩擦因数差值过大将出现明显的爬行现象。