1302 Ni基一方向凝固超合金の疲労き裂伝ぱ駆動力に及ぼす結晶粒構成とき裂先端形状の影響(G03-1 き裂進展・破面解析,G03 材料力学)

概要

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In order to clarify the effect of microscopic inhomogeneity on driving force of crack propagation (elastic J-integral), elastic finite element anarlysis (FEA) is carried out for a cracked body of which grain-shape and orientation, and crack shape are reproduced from a fatigue crack propagation test specimen of directionally solidified superalloy. Here, the load axis is set to be perpendicular to the solidification axis. The analysis reveals that J-integral is affected by two factors, elastic compliance nearby the crack tip and the angle between the crack tip and load axis. The former causes the submm order of fluctuation in J-integral, and the latter causes the sporadic drop of J-integral at the point where the crack direction is largely apart from the direction normal to the load axis.
社団法人日本機械学会の論文
2005-09-18