球圧子押込みによるセラミックスの微小破壊強度評価に及ぼす表面層除去の影響

概要

論文の詳細を見る
An investigation was made concerning the influence of surface removing on the microfracture strength of the surface layer of structural ceramics as evaluated by sphere indentation tests, where the microfracture strength was defined as the maximum tensile stress at ring crack initiation. Indentation tests were carried out on polished Si_3N_4 plates using a Si_3N_4 spherical indenter. Conventional bending tests were also conducted. As in unpolished specimens, the scatter of the microfracture strength was found to be much smaller than that of the bending fracture strength. Thus, surface removing does not alter our previous finding that the microfracture strength can not be related to the bending fracture strength based on the concept of effective area. An idea based on fracture mechanics was suggested to relate the two kinds of strength.
一般社団法人日本機械学会の論文
1994-08-25