衝撃三点曲げ試験における動的応力拡大係数の簡便評価法

概要

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In the impact 3-point bending test, it had been shown that a loss of contact between the specimen and the anvils occurred in the early stage of the impact, and then the specimen was subjected to the reaction force from the anvils. The boundary conditions usually assumed for the simply supported beam are invalid for such a case. In the present paper, a simple method of evaluating the dynamic stress intensity factor which takes into account such behavior of the specimen during impact is presented. The specimen was modelled as the beam with a crack and analyzed based on Timoshenko's beam theory. A numerical example concerning the experimental results performed by Bo^<..> hme et aI^.. was presented and its results were compared with the measured values by Bo^<..> hme. As a result, a good agreement was obtained between the values. Furthermore, the procedure to estimate the reaction force from the anvils was also proposed. By using this procedure, it became possible to evaluate the dynamic stress intensity factor without measuring the reaction force.
一般社団法人日本機械学会の論文
1991-01-25