Si_3N_4の繰返し混合モード荷重下でのき裂伝ぱ挙動

概要

論文の詳細を見る
Fracture behavior of Si_3N_4 ceramic was investigated under cyclic mode I/mode II mixed-mode loading in various environments. The crack propagation rate was higher than for cyclic mode I loading, and it was higher in water than in nitrogen gas. The fretting and hydration reaction seemed more active than those for cyclic mode I loading, and therfore even if the stress shielding effects by particle bridging and wedging exist, those effects were easily decreased, and the effective stress intensity factor range ΔK_<tip> was increased. When the debris was accumlated by the fretting between the crack surfaces, the substantial effective stress intensity factor for mode II was increased. Therefore, it was suggested that in the case that K_I was decreased by the particle bridging and K_<II> was increased by the fretting the fracture morphology became transgranular fracture rather than interglanular fracture.
社団法人日本材料学会の論文
1994-09-15