角部の応力拡大係数を用いた強度評価法

概要

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In this paper, a method of evaluating static strength by applying the newly difined stress intensity factor of an angular corner is considered. Recently, it has been found that the stress field near a corner of jointed dissimilar materials is expressed as a sum of the symmetric state with a singularity of 1/r^<1-λ1> and the skew symmetric state with a stress singularity of 1/r^<1-λ1> In this respect, the fracture tests are carried out on the plane specimens of acrylic resin having single and double sharp notches. Different artificial notches are introduced into the specimens with varying the opening angle, the notch depth, and the loading conditions. It is found that the fracture toughness K_<1C, λ1> is almost constant independent of the notch depth and the loading condition. In addition, the value of K_<1C, λ1> increases with increasing opening angle because of the decrease of the order of singularity. The fracture criterion for different opening angles of the notch is also discussed on the basis of the stress distribution near the notch. The usefulness of K_<1, λ1> in the evaluation of static strength is confirmed through experimentation.
一般社団法人日本機械学会の論文
1996-06-25