曲げCOD試験片におけるNotch Acuity効果の定量化に関する一提案

DOI NDLデジタルコレクション NDLデジタルコレクション Web Site 被引用文献6件

書誌事項

タイトル別名
  • Effect of Notch Acuity on Critical COD with COD Bend Test Specimens
  • マゲ COD シケンヘン ニ オケル Notch Acuity コウカ ノ テ

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The conventional COD bend tests are frequently used for the purpose of obtaining a critical COD (δc). But it is well known that δc shows various values depending on notch acuities. Accordingly, COD bend test specimens have usually a fatigue notch. However the industrial material tests are desired to be simple. In this sense, it is desirable that COD bend test specimens have only machined notch.<BR>In this paper, the transformation equations of a mouth COD (Vtotal) for a machined notch to δc for a fatigue notch are proposed by considering the machined notch root displacement. These transformation equations are expressed as follows :<BR>δ= O.45 (W-a) /0.45W+0.55a+Z [(Vtotal-Ve) -V'] … (Vtotal-Ve≥2V')<BR>O.45 (W-a) /0.45W+0.55a+Z [(Vtotal-Ve) 2/4V'] … (Vtotal-Ve<2V')<BR>Ve= 0.8d0.3 … (Vtotal≥4V')<BR>{0.8d0.3-0.74d0.45 (1-Vtotal/4V')} Vtotal… (Vtotal<4V')<BR>where<BR>V'=γσYW (1-v2) /E : limit elastic clip gauge COD defined by Wells, <BR>W : specimen width, a : crack depth, <BR>Z : distance from free surface to positions setting a clip gauge, <BR>d : initial notch root width (d≤0.4mm)<BR>The above proposed equations are obtained from results of F. E. M. analysis, and it was confirmed that the relation between δ by the above equations and the plastic zone size is not different in the case of various notch acuities of the specimens. These equations are engineeringly satisfactory in the range of d≤0.4 mm for various materials.

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