三次元き裂における混合モードの応力拡大係数 : コーステックス法と光弾性法による算定

概要

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In fracture problems, stress intensity factors obtained theoretically or by experimental analyses have been effectively applied as a quantity of the magnitude of the stress field occurring in the highly stressed region at the vicinity of the crack tip. In actual construction materials, the combined action of stress intensity factors under complex stress conditions often exists in most cases. In this paper, an experimental technique is presented for determining the mixed-mode stress intensity factors K_<II> and K_<III> separately for a three-dimensional cracked-body problem. The stress intensity factor K_<II> is determined by the photoelastic method with an isochromatic fringe loop, and the stress intensity factor K_<II>, which is often not easy to evaluate with experimental and calculation method, is determined by using the method of reflected caustics in combination with the stress-freezing method. It was found that by using the present experimental technique, the mixed-mode stress intensity factors K_<II> and K_<III> and for a three-dimensional crack can be easily separated.
一般社団法人日本機械学会の論文
1992-02-25