混合モード予き裂からの屈折疲労き裂伝ぱ挙動に関する研究 : 円孔を含む斜めき裂の不連続変位分布に基づいて

概要

論文の詳細を見る
Fatigue crack bending and growth behaviors were studied under mixed-mode conditions, using annealed and fatigue slant precracks with a center-hole notch. The crack growth direction was estimated from the stress intensity factors K_I (mode I) and K_<II> (mode II) evaluated from the discontinuous displacements along the precrack, using the maximum tangential stress criterion, and it was in good agreement with the measured ones. The fatigue crack propagation rate during bending was controlled by the effective stress intensity factor range ΔK_<eff> using K_I and K_II, in which a total critical displacement ahead of the crack tip under the mixed-mode condition is adopted as the fracture criterion based on the BCS crack theory. After the crack was bent, the subsequent fatigue crack propagated under the mode I behavior at the crack tip; therefore K_I determined from the discontinuous displacements could be regarded as ΔK_<eff> for the bent crack.
一般社団法人日本機械学会の論文
1996-09-25