| Summary: | 碩士 === 國立成功大學 === 機械工程學系 === 104 === Rubber bearings have been widely applied in seismic engineering and were introduced into precision machine design field recently. Rubber bearings could possibly achieve the same function as that of those much larger compliance mechanisms and therefore this represents a possible advantage in compact precision machine design. However, the mechanical behaviors of rubbers are relatively complicated and must be carefully considered for precision machine applications and existed testing systems may not be adequate and a novel elastomer testing system design should be investigated. In this thesis, based on the previous proposed design, a novel biaxial testing system is constructed. However, this design still exists lots of problems. Therefore, the first task is to revise the previous designs for improving performances in both mechanical and thermal aspects. For example, in this work, the cause of system resonance is identified and the thermal response is also improved by reducing the thermal loss and adding another heat source. On the other hand, the rotational subsystem, which can measure torque and rotation angle, is finally realized for performing a true bi-axial testing. Finally, we also construct a high strain compression test system to conduct the material characterization under very high strain. Through this work, the biaxial material testing system is ready. We then use this system to test the PDMS rubber for investigating essential rubber material properties and structural longevity. To understand the rubber bearing properties, three experiments are considered: compression, shearing, and fatigue tests. On compression test, we discuss the rubber bearing properties in high strain and consider the effect of crack on rubber. In addition, test the adhesion ability between the rubber and the metal in rubber bearing. On shearing test, shape factor, temperature, and damping are considered. Finally, we discuss the rubber durability in different crack length, input and curing situation on fatigue test. Through above works, we complete the biaxial material testing system and we can take these experiment result to offer some references for rubber bearing applied on precision machine.
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