随着车辆的重载化和高速化，车轮的热负荷进一步增加，对车轮的疲劳寿命带来重大影响。

When the increasing of the speed and loading of the freight train, the heat load of the wheel will certainly increase, the life of the rail wheel may be influenced terribly.

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目的研制冷热循环机械载荷咀嚼模拟疲劳试验机来人工模拟口腔环境的温度变化和咀嚼负荷，检测口腔材料的疲劳寿命。

Objective to design a new kind of thermocycling and mechanical loading (TCML) chewing simulator and test the chronic fatigue characteristics of dental materials and prosthesis.

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