9. Effect of Mechanical Stress Load Fracture in Welded Wide Plate

概要

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A general theory was proposed to explain the mechanism of brittle fracture in welded and notched wide plate, based on the concept of flow and fracture stress curves. The analysis was made on a series of low load fracturing in welded and notched specimen. In the analysis, the history of plastic stress and strain at the notch tip in welded specimen was predicted from the test result on round bars with a reasonably assumed value of plastic strain concentration factor for the notch, also by taking into account of the shape of the stress-strain cycle curve and introducing the concept of Orowan's plastic constraint factor for a sharp notch. The result of the investigation showed that the proposed theory was succeeded in clarifying the mechanism of brittle fracture including recovery in fracturing load due to mechanical stress relieving.
社団法人日本船舶海洋工学会の論文