A STUDY ON LOW CYCLE FATIGUE STRENGTH OF WELDED JOINTS BY MEANS OF TESTING SYSTEM WITH IMAGE ANALYSIS

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  • TATEISHI Kazuo
    社団法人 土木学会 名古屋大学 理工科学総合研究センター
  • HANJI Takeshi
    社団法人 土木学会 名古屋大学大学院 工学研究科土木工学専攻

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  • 画像計測を用いた試験システムによる突合わせ溶接継手の低サイクル疲労強度の検討
  • ガゾウ ケイソク オ モチイタ シケン システム ニ ヨル ツキアワセ ヨウセツ ツギテ ノ テイサイクル ヒロウ キョウド ノ ケントウ

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Abstract

Low cycle fatigue strength of welded joints was investigated by means of newly developed fatigue testing system in which image analysis technique was applied to measure the strain of specimens. It was validated that the strain measured by the image analysis was almost equal to measured value by strain gauge, and the low cycle fatigue strength of steel plate without welding was in good agreement with the results reported in former researches. After verifying the testing system, fatigue tests were carried out on welded joint specimens. The test results indicated that the low cycle fatigue strength of welded joints was much lower than that of plain material, and fatigue life was reduced by half.

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