繰返し荷重下における窒化ケイ素セラミックスのき裂進展挙動 : 材質の違いの影響

概要

論文の詳細を見る
The crack propagation behavior under cyclic load was investigated on two types of sintered Si_3N_4. The main results obtained are as follows. (1) The crack propagation rate was accelerated by cycling the load. As the stress ratio decreased or the test frequency increased, the crack propagation rate increased. (2) If the fracture toughness of a specimen was large, the crack propagation rate was small as compared with that of another specimen with small fracture toughness. (3) Debris of the fractured grains and wear mark were left on the fracture surface under the cyclic loads, however, neither such debris nor wear mark were observed on the fast fracture surface. (4) By measuring the crack opening displacement, crack closure was observed. The size of debris (〜1μm) on a fracture surface under the cyclic load was nearly equal to the crack opening displacement at no load. It was concluded that the crack closure of sintered Si_3N_4 was induced by debris between the crack surfaces.
一般社団法人日本機械学会の論文
1990-01-25