TY - JOUR
T1 - Effect analysis of stress-intensity-factor-range decreasing rate for obtaining threshold stress-intensity-factor-range
AU - Li, Bochuan
AU - Koyama, Motomichi
AU - Hamada, Shigeru
AU - Noguchi, Hiroshi
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/12
Y1 - 2019/12
N2 - The threshold stress intensity factor range ΔKth can be obtained using the ΔK decreasing method. Because ΔKth is dependent on the ΔK decreasing rate, the rate is regulated by the American Society of Testing Materials standard. However, the rate was derived under specific conditions, and its applicability to materials with physical properties different from ordinary steel has not been clarified. To address this issue, this study performed plasticity-induced-crack-closure analysis with the Dugdale model. The dependence of material properties on ΔKth of long crack was determined for steel, aluminum and magnesium. The results showed that the rate value proposed by the standard is valid for all materials with different yield strengths and different Young's moduli within 10% error.
AB - The threshold stress intensity factor range ΔKth can be obtained using the ΔK decreasing method. Because ΔKth is dependent on the ΔK decreasing rate, the rate is regulated by the American Society of Testing Materials standard. However, the rate was derived under specific conditions, and its applicability to materials with physical properties different from ordinary steel has not been clarified. To address this issue, this study performed plasticity-induced-crack-closure analysis with the Dugdale model. The dependence of material properties on ΔKth of long crack was determined for steel, aluminum and magnesium. The results showed that the rate value proposed by the standard is valid for all materials with different yield strengths and different Young's moduli within 10% error.
KW - ASTM standard
KW - Plasticity-induced crack closure analysis
KW - Threshold stress intensity factor range
KW - ΔK-decreasing rate
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U2 - 10.1016/j.tafmec.2019.102377
DO - 10.1016/j.tafmec.2019.102377
M3 - Article
AN - SCOPUS:85072988151
SN - 0167-8442
VL - 104
JO - Theoretical and Applied Fracture Mechanics
JF - Theoretical and Applied Fracture Mechanics
M1 - 102377
ER -