超音波法による安定破壊開始点の検出と単一試験片による弾塑性破壊じん性の評価

概要

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An ultrasonic method was applied to elastic-plastic fracture toughness testing, and the relationship between the plastic blunting at the fatigue precrack tip or the onset of stable crack growth and the echo difference output voltage characteristics during fracture toughness loading were clarified. The elastic-plastic fracture toughness test procedure based on Top-on and End-on ultrasonic methods was proposed by which the J_<Ic> value can be determined using a single specimen. The J_<Ic> values for various metallic materials from medium strength steels to aluminum and titanium alloys were evaluated according to the proposed J_<Ic> test procedure. The J_<Ic> measurements were also compared with those determined according to the SZ method using multiple specimens and those determined according to the AE method using a single specimen. It is confirmed that the proposed J_<Ic> test procedure based on Top-on and End-on ultrasonic methods is very useful.
社団法人日本材料学会の論文
1983-09-15