Papers by Author: Hiroshi Matsuno

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Authors: Hiroshi Matsuno
Abstract: Experimental characteristics of complementary plastic energy produced by a stress-strain hysteresis curve at a saturated stage in low cycle fatigue are investigated for some steels, and mechanical models for analyzing microstructures of fatigued metals are discussed. As a result, it is found that volume of a cell is varied in inverse proportion to plastic strain range: the density of cells is in proportion to plastic strain range. Consequently, the total number of cells is proportional to plastic strain range. This final conclusion is similar to Winter's opinion concerning persistent slip band structures in high cycle fatigue [1] where, although wall spacing of a cell is invariable and inde-pendent of plastic strain range, a region occupied by persistent slip bands increases proportionally to plastic strain range and consequently the number of cells is in proportion to plastic strain range.
513
Authors: Hiroshi Matsuno
Abstract: Fatigue strength data of metals are picked up from literature and rearranged on the basis of the equivalent stress ratio which has previously been proposed by the author. The characteristics of fatigue strength are especially investigated for metals containing nonmetallic inclusions and phase in-homogeneity. As a result, it is found that σ w2 -type fatigue strength is often exhibited even in a specimen without a notch and it leads to a wide range of scattering of fatigue strength of unnotched specimens.
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