すみ肉溶接継手の溶接止端における曲げ疲労き裂の発生・進展挙動 : 鋼すみ肉溶接継手の曲げ疲労に関する研究(第一報)

概要

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In order to study on fatigue crack growth characteristics at the toe of fillet welded joints, simple plate type specimens with fillet welded gussets were tested under load controlled conditions by T-and 4-point-bending. Fatigue crack growth tests on edge-notched and planer surface notched specimens were also carried out under plane bending load. The results are summarized as follows : (1). Fatigue crack growth behaviors along the weld toe lines were affected by bending stress range, Δσ_b and stress concentration factor at the weld toe, K_t, but to depth direction not so much affected by the variation of Δσ_b. (2). The average crack growth rates along the weld toes in earlier stage of life may be expressed as, d(2b)/dN=C(K_t・Δσ_b・(ƒ)_1(R))^m here, (ƒ)_1(R) : Coefficients of stress ratio R, 1.0 for R=0 and 0.614 for R=-1; C, m : Material constants. The values of (ƒ)_1(R), C and m to be used were derived from the test results of surface notched specimens. (3). The crack growth rates to depth direction may be expressed as, da/dN=C・ƒ(R)・(ΔK)^m here, ƒ(R) : Coefficients of stress ratio R, 1.0 for R=0 and 0.5 for R=-1. ΔK : Range of stress intensity factor in a plate with edge crack under uniform bending. C, m : Material constants derived from the test results of edge notched specimens.
社団法人溶接学会の論文
1983-03-05