破壊力学 せん断(ModeII)疲労き裂伝ぱ抵抗値ΔKτthの測定方法とその応用

書誌事項

タイトル別名
  • Special Issue on Fracture Mechanics. New Measurement Method of Mode II Threshold Stress Intensity Factor Range .DELTA.K.TAU.th and Its Application.
  • センダン Mode 2 ヒロウ キレツ デンパ テイコウチ デルタ K タウ

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抄録

In order to measure the Mode II fatigue crack growth resistance of SS41 steel and a rail steel, a particular double-cantilever type specimen with side grooves was designed. Mode II fatigue crack growth tests by using the newly designed specimens were conducted by a conventional closed-loop type tension-compression fatigue testing machine under a constant load amplitude which corresponds to ΔKII-decreasing test with increase in crack length. The crack length was measured by the AC potential method. Mode II crack growth rate gradually decreased as the crack grew. The typical fracture surface of Mode II fatigue crack growth which was quite different from Mode I fatigue fracture surface was observed. But the trace of local branching of crack growth mode from Mode II to I was observed on the overall fracture surface of Mode II. The relationship between Mode II crack growth rate (da/dN) and ΔKII was obtained.

収録刊行物

  • 材料

    材料 43 (493), 1264-1270, 1994

    公益社団法人 日本材料学会

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