Abstract
Two types of the amorphous high polymer materials were used in this paper, one was PC with a ductile property, and another was PMMA with brittle property. The changes of the dynamic Visco elasticity and the fracture phase in the fatigue process were determined to the fatigue fracture mechanism in the difference stress amplitude at room temperature. The results are following as (1) By the tensile testing, PC showed an obvious yield phenomenon so it is a type ductile material, PMMA with the strain below 8% showed the brittle fracture. (2) The fatigue life of PMMA would be low companion with the increase in the stress amplitude, however, the fatigue life of PC was not a simple low, and it would be reverse increase on the certain range of the stress amplitude. The reason may be form a part of ductile fracture on the maximum fracture stress direction of the about 45°. (3) The fatigue fracture properties of PMMA and PC was deeply relative to the change trend of E′, tan δ, ΔL and the fracture surface property.
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