予き裂を導入したセラミックスの常温における静疲労と繰返し疲労
スポンサーリンク
概要
- 論文の詳細を見る
The static and cyclic fatigue behaviors of alumina, silicon carbide, silicon nitride and partially stabilized zirconia were investigated at room temperature. Flexural specimens, with an indentation induced flaw at the center of each specimen, were tested under cyclic and static loads applied by four-point bending. All ceramics showed static and cyclic fatigue susceptibility- The fatigue degradation compared to its flexural strength increased in this order; silicon carbide, silicon nitride, alumina and partially stabilized zirconia. The cyclic fatigue strength of zirconia became as small as one-third of its flexural strength. Moreover, the fracture mode for the static and cyclic fatigue in zirconia was the mixed type of transgranular and intergranular cracking, although the intergranular cracking was dominant in the fast fractured portion. Between the static and cyclic lifetimes, little difference was observed in silicon carbide. However, a small acceleration by cyclic loading was observed in alumina at a relatively low applied stress, and a large acceleration was obtained in silicon nitride and in partially stabilized zirconia. The conventional fatigue theory, where the crack growth rate is time-dependent only, was not applicable in these materials- This acceleration by the cyclic loading is considered to be a result of the interaction between fatigue crack and microstructure, such as an interlocking effect against intergranular cracking in elongated columnar polycrystals of silicon nitride, and a transformation and micro cracking in the process zone for partially stabilized zirconia. These interactions improve fracture toughness but cause a non-linear fracture behavior, and thus cyclic fatigue damage is accumulated due to stress hysteresis in cyclic loading.
- 社団法人日本材料学会の論文
- 1988-08-15
著者
関連論文
- 圧電駆動型RF-MEMS可変キャパシタの電気特性
- (Ba,Sr)TiO_3膜のエピタキシャル成長と強誘電特性
- 炭化ケイ素および安定化ジルコニアの高温水中における腐食挙動 : (セラミック材料小特集)
- 290℃純水中におけるセラミックスの腐食挙動
- (Ba, Sr) TiO_3膜の物理 : 第一原理計算と実験
- 原子,分子の運動と薄膜のミクロ設計
- 常圧焼結窒化ケイ素の常温における繰返し疲労
- FeRAMの現状と将来技術
- 予き裂を導入したセラミックスの常温における静疲労と繰返し疲労
- セラミックスの常温における繰返し疲労挙動(粉体小特集)
- 326 窒化ケイ素の高温における亀裂成長挙動(セラミックスII)
- 235 常圧焼結窒化ケイ素の疲労挙動(セラミックスII)
- 115 Alloy X-750の高温純水中腐食疲労き裂進展挙動(腐食疲労)
- J積分による高温水中の応力腐食割れ伝播速度の解析
- 討 26 SUS 304 鋼の高温純水中における腐食疲労伝播挙動(V 腐食疲労, 第 98 回講演大会討論会講演概要)