Development of Ultra-High Temperature-use Extensometer and Prediction for Creep- and Fatigue-Life of Ceramics at High Temperatures

超高温用引伸计的研制及陶瓷高温蠕变寿命和疲劳寿命的预测

• 批准号: 09555034
• 负责人: HATANAKA Kenji
• 金额: $ 8.96万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555034/
• 关键词: High-Temperature-Use Extensometer; Silicon Nitride Ceramics; High Temperature Push-Pull Fatigue Test; Cyclic Stress-Strain Response; Inelastic Strain; 高温クリープ・疲労; 微小繰返し変位; 閉ループ型電気油圧式疲労試験機; 高温クリープ・疲労寿命

The ultra-high temperature-use extensometer was newly developed. Then this was equipped with the high temperature push-pull fatigue test system. The cyclic axial loaddisplacement response was measured in the smooth specimen of silicon-nitride ceramics under push-pull loading at load ratio of -1.0 at 1200℃ and 1300℃. The great amount of inelastic strain was detected, which was greatly dependent on stress rate. Such an inelastic strain is easier to generate under tensile loading than under compressive one. The stress-inelastic strain hysteresis loop was characterized by the fatter shape on the tensile stress side than on the compressive stress side, since much larger inelastic strain occurs during loading and unloading excursions on former than on the latter.The relationship between maximum stress and equivalent life time which was calculated through SCG (Slow Crack Growth) theory was obtained from push-pull fatigue tests at 1200℃. The equivalent life time of fatigue tests were larger than life time obtained from static fatigue tests at same maximum stress level in low mean stress and high stress amplitude region. This result showed that silicon nitride ceramics was strengthened by the cyclic loadings in these test conditions.

超高温引伸计是一种新研制的超高温引伸计。然后配备了高温推拉疲劳试验系统。在1200℃和1300℃下，对氮化硅陶瓷光滑试样在载荷比为-1.0的推拉载荷下进行了轴向循环载荷-位移响应的测量。检测到大量的非弹性应变，这在很大程度上取决于应力速率。这种非弹性应变在拉伸载荷下比在压缩载荷下更容易产生。应力-非弹性应变滞后环的特征是拉应力侧的形状比压应力侧的形状粗，因为前者在加载和卸载过程中产生的非弹性应变远大于后者.通过1200℃的推拉疲劳试验，得到了最大应力与等效寿命的关系，并利用SCG（Slow Crack Growth）理论计算了等效寿命.在低平均应力和高应力幅区，疲劳试验的等效寿命大于相同最大应力水平下的静态疲劳试验的等效寿命。结果表明，在这些试验条件下，氮化硅陶瓷通过循环载荷得到强化。

项目成果

幡中憲治、石賀裕輔: "超高温変位計の試作とセラミックスの高温疲労強度に関する基礎研究"日本機械学会中国四国支部第37期講演会講演論文集. No.995-1. 21-22 (1999)

Kenji Hatanaka，Yusuke Ishiga：“超高温位移计的原型和陶瓷高温疲劳强度的基础研究”日本机械工程学会中国四国分会第37届年会论文集。 995-1。21-22（1999））

HATANAKA, K and ISHIGA, Y,: "Cyclic Stress-Strain Response of SiィイD23ィエD2NィイD24ィエD2 Ceramics at Elevated Temperatures"Proceedings of 6th Japan International Congress on Experimental Mechanics,(to be published). (2000)

HATANAKA, K 和 ISHIGA, Y，：“SiD23D2ND24D2 陶瓷在高温下的循环应力-应变响应”第六届日本国际实验力学大会论文集（即将出版）（2000 年）。

HATANAKA, K, ISHIGA, Y and TOYAMA, H: "Development of Ultra-High Temperature-use Extensometer and Measurement of Stress-Strain Response of Silicon Nitride Ceramics at Elevated Temperatures Fatigue Strength of Ceramics at Elevated Temperatures"Transaction

HATANAKA, K、ISHIGA, Y 和 TOYAMA, H：“超高温用引伸计的开发以及氮化硅陶瓷在高温下的应力应变响应的测量 陶瓷在高温下的疲劳强度”交易

幡中憲治: "超高温変位計の試作とセラミックスの高温強度に関する基礎的研究" 日本機械学会中国四国支部第37期講演会論文集. No.995-1. 21-22 (1999)

Kenji Hatanaka：“超高温位移计的原型和陶瓷高温强度的基础研究”日本机械工程学会中国-四国分会第37次研讨会论文集No.995-1。 22 (1999)

幡中憲治: "超高温変位計の開発と窒化けい素セラミックスの高温下の応力-ひずみ応答の計測" 1999 JSME Annual Moeting 講演論文集. (発表予定).

Kenji Hatanaka：“超高温位移计的开发和高温下氮化硅陶瓷应力应变响应的测量”1999 年 JSME 年度会议论文集（待发表）。