Estimation of Thermal Shock Resistance of Al_2O_3 Ceramics by Laser Irradiation

フォーマット:

論文

責任表示:

Akiyama, Shigeru ; Amada, Shigeyasu ; Yoshii, Tokuharu

言語:

英語

出版情報:

社団法人日本機械学会, 1995-10-15

著者名:

• Akiyama, Shigeru
• Amada, Shigeyasu
• Yoshii, Tokuharu

掲載情報:

JSME international journal. Ser. A, Mechanics and material engineering

ISSN:

09148809    

巻:

38

通号:

4

開始ページ:

594

終了ページ:

600

バージョン:

VoR

概要:

application/pdf<br />Journal Article<br />Various structural ceramics have been developed as heat-resistant materials. In some applications it is anticipated that they will be exposed to very-high-temperature environments of the order of thousands of degrees. Moreover, these ceramics are subjected to thermal loadings which change rapidly with time. Therefore, it is very important to investigate their thermal shock characteristics. In this … report, the distributions of temperatures and thermal stresses of cylindrical-shaped Al_2O_3 ceramics under irradiation by laser beams are analyzed using the finite element method. Critical fracture curves are obtained from the relationships between spot diameters of laser beams and maximum values of thermal stresses for various power densities of laser beams. The irradiation experiments yield these critical fracture curves, and theoretical and experimental curves are in good agreement. 続きを見る