斜め予き裂からの疲労き裂の屈折・成長に関する研究 : き裂の変位不連続性とそれに基づく応力拡大係数に注目して

概要

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By using slanted pre-crack specimens, fatigue crack growth under a mexed-mode condition was duscussed within the scope of linear fracture mechanics. The discontinuous displacement measured along the pre-crack with an angle B=30 deg. between the crack and the axis of tension was smaller than the theoretical value. This discrepancy suggests the contact of the crack surfaces under a large relative slip displacement. the measured fatigue fracture angles agreed well with the values calculated based on the maximum tangential stress criterion, using the effective stress intensity factors(Mode I,II) estimated from the discontinuous displacement along the pre-crack. For the bent crack formed after fatigue crack initiation from the pre-crack, the path of the fatigue crack growth was mainly dominated by a mode I discontinuous displacement component on the measurement. A method was described in which the bent crack was converted into a straigth crack in a vector form of the discontinuous displacement along the crack. Using this method, the stress intensical values except the case of the heavy contacts between the crack surfaces.
社団法人日本材料学会の論文
1993-05-15