ポリイミド被覆を有する石英製キャピラリの引張強度評価

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We evaluated the distribution of tensile strength in polyimide covered silica capillary tubing. We also investigated the effect of the polyimide covering on the tensile strength and analyzed the effect of the initial non-penetrated crack length on the crack propagation by using FEM. The diameter of silica capillary tubing was 150μm. The surface of the silica capillary tubing was covered with a 12μm-thickness of polyimide. The length of the tensile specimens was 400mm. The relation between the tensile strength of silica capillary tubing and the fracture probalility was distributed into a strong and a weak group. The tensile strength distribution in the strong group was the original strength distribution caused by manufacturing deviation, and that of the weak group resulted from microcracks introduced during or after the specimen manufacturing process. We can predict the strength of the silica capillary tubing using the strength of the optical fibers, because the strength properties of the silica capillary tubing with the polyimide covering were the same as the static strength properties of the optical fibers. We found that the polyimide covering did not improve the tensile strength of the silica capillary tubing, but it was effective as an overcoat. Using FEM analysis, we found that the non-penetrated crack in polyimide covering did not reach the quartz surface during handling, and crack propagation was restrained near the interface because Young's modulus of the polyimide was smaller than that of quartz. When applying silica capillary tubing, we recommend that more attention should be paid to the micro-crack formation on the surface of the quartz than to the crack growth in the polyimide covering.
社団法人日本機械学会の論文
2005-10-25

ポリイミド被覆を有する石英製キャピラリの引張強度評価

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