Abstract
Fatigue properties of canopy PMMA with typical damage, which are two different depth scratches of 0.3mm and 0.4mm, are studied by experimental method. In order to gain the fatigue strength about the depth scratches of 0.3mm in the designated life, experiments based on up and down method had been conducted. The S-N curves of the PMMA about the depth scratches of 0.3mm were acquired based on three-parameter exponential function. Fatigue life of the PMMA with the depth scratches of 0.4mm under different stress levels is obtained by grouping method. Fatigue properties of the canopy PMMA of the two different depth scratches were discussed. The results of analysis showed that compared with the depth scratches of 0.3mm, fatigue properties of canopy PMMA with the depth scratches of 0.4mm decrease significantly.
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