十字形試験片の設計とそれによる二, 三の二軸疲労き裂進展試験

概要

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Optimum design of cruciform specimen was performed for biaxial loading-fatigue test on the basis of the calculations through elastic finite element method. The stress must be greater in its central thickness-reduced region than in any other regions including four corners in the specimen, since fatigue crack should originate at this site. The stresses calculated in the central thickness-reduced region of the cruciform specimen with the determined configuration and dimensions are in quite good agreement with those measured with strain gauges, evidencing that the present calculation method is reasonable for designing the cruciform specimen. Several fatigue crack growth tests were performed under uniaxial and equi-biaxial loading using the cruciform specimen. The tests showed that crack growth was not influenced by the in-phase cyclic loadings parallel to crack plane, being controlled only by mode-I cyclic loading. The background of such test results was examined in terms of plastic deformation calculated around the crack tip by means of elastic-plastic finite element method.
一般社団法人日本機械学会の論文
1996-11-25