2434 カテーテルの変形挙動と強度に関する研究 : 純曲げの応力緩和の特性(G03-8 変形・弾塑性挙動(1),G03 材料力学)

Abstract

Generally, as for the material of catheter, soft characteristic is necessary not so as to damage vascular wall etc. On the other hand, a responsibility and enough rigidity are also required for the surgical operations such as myocardial or cerebral infarction. The purpose of this study is to investigate physical property of the catheter, which made of soft nylon resin and is reinforced with thin stainless wires called braid. In our previous report, applying the step strain for tension and torsion with two-stages, we ever have been investigated the phenomenon of stress relaxation by changing the order of tension and torsion, and we have been examined the effect of these loading histories on the visco-elastic property. In this paper, the phenomenon of stress relaxation under the pure bending is especially investigated by performing the experiments of 4-point bending and we try to formulate the numerical model based on these experimental results.