| Summary: | 碩士 === 國立屏東科技大學 === 車輛工程系所 === 105 === The numerical method is utilized to study the couple-field thermal and structure of solid disc of thermal fatigue test. First, the index of the temperature comparison between the fatigue test and simulation is used to evaluate the temperature of solid disc. Secondly, time dependent temperature result was imported by the simulation of thermal fatigue, and cast iron modulus was utilized to given high temperature material properties to evaluate the thermal stress and deformation of solid disc and discuss possibly causes of the phenomenon. Thirdly, nine different types of the solid discs was calculated on the single braking test condition, and index of the temperature phenomenon, thermal stress, thermal deformation was discussed in this paper. It was found that the most sensitive position of temperature change is on the middle of friction surface of solid disc, and the phenomenon of temperature on the groove or neck has not related to the temperature increasing of friction surface and was caused by the conduction of solid disc. The stress was occurred on the groove and friction surface of the solid disc, the main reason of the stress caused was the heat dissipation difference in the disc body by the thermal expansion when the temperature raising of solid disc. The groove has plastic strain and was caused by tensile stress when the thermal deformation occurred, and the radial and tangential stress of the friction surface of the solid disc was occurred by the same reason. The nine prototypes was calculated on the single braking test, and was found that the disc thickness has more effect on the temperature, and the max. principal stress still occurred on the groove, it can be optimize by increasing the groove width or change the groove side fillet, besides that the flatter groove mid surface can reduce the stress occurred and flatter the tilted of brake disc.
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