SEDL / STP / STP1201-EB / STP12775S

A Comparative Study of Existing and Newly Proposed Models for Creep Deformation and Life Prediction of Si³N⁴

Ding, J-L
Associate Professor, Washington State University, Pullman, WA

Liu, KC
Senior Scientist and Group Leader, Oak Ridge National Laboratory, Oak Ridge, TN

Brinkman, CR
Senior Scientist and Group Leader, Oak Ridge National Laboratory, Oak Ridge, TN

Pages: 22    Published: Jan 1994

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Abstract

This paper summarizes recent experimental results, obtained at Oak Ridge National Laboratory (ORNL), on creep behavior and creep rupture of a commercial grade of Si³N⁴ ceramic in the temperature range of 1150°C to 1300°C. A uniaxial model capable of describing the behavior under general thermomechanical loading is introduced and compared with existing models. An exploratory extension of the new model to a multiaxial form is then discussed. Issues are also discussed concerning the standardization of data analysis methodology and future research needs in the area related to development of creep database and life prediction methodology for high temperature structural ceramics.