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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 150 μm. The surface of the silica capillary tubing was covered with a 12μm-thickness of polyimide. The length of the tensile specimens was 400 mm. 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

Evaluation of Tensile Strength on Polyimide covered Silica Capillary Tubing