Near─Threshold Fatigue Crack Growth Properties for SB42 and SUS304 Steels at Elevated Temperatures : Solid-Mechanics, Strength of Materials

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概要

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• Near-threshold fatigue crack growth behavior for SB 42 carbon steel and SUS 304 stainless steel was investigated at elevated temperatures of 200 and 400℃ at a frequency of 50 Hz. A new test procedure was atempted in order to avoid crack closure: ΔK was decreased under increasing minimum load. A unique ΔK_<th>-value of about 2.8 MPa・m^<1/2> was obtained independent of material and temperature by the closure-free test procedure. The crack growth rate, however, was found to be accelerated in the ΔK region higher than 4 MPa・m^<1/2> for both materials at elevated temperatures. The fractographic features influenced by microstructure and environment were discussed in terms of the mechanism of crack growth.

• 一般社団法人日本機械学会の論文

著者

• Nishijima Satoshi

  Fatigue Testing Division National Researh Institute For Metals

• TAKEUCHI Etsuo

  Fatigue Testing Division, National Research Institute for metals

• MATSUOKA Saburo

  Fatigue Testing Division, National Reserc Institute for metals

• Takeuchi E

  National Inst. For Materials Sci. (mits/nims) Tsukuba Jpn

関連論文

• Near─Threshold Fatigue Crack Growth Properties for SB42 and SUS304 Steels at Elevated Temperatures : Solid-Mechanics, Strength of Materials

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