抄録
This paper describes the relation between the flattening phenomenon in the cross section and the visco-elastic behavior of the catheter made of soft nylon resin which is reinforced with thin stainless wires called braid. Especially, by considering that the shape of cross section gradually changes into the elliptical shape during process of applying the torsional moment, the experimental formula for the torsional moment is derived based on the shear flow theory, and then, the values of torque when the flattening phenomenon begin to start are estimated. Moreover, in this study, in order to confirm the effect of axial force on the flattening phenomenon, the experiments are conducted under conditions that the initial axial force is variously changed.
