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ASTM Selected Technical Papers
Life Prediction Methodologies and Data for Ceramic Materials
By
CR Brinkman
CR Brinkman
1
Martin Marietta Energy Systems
;
Oak Ridge, TN 37831-6154
;
symposium chairman and editor
.
Search for other works by this author on:
SF Duffy
SF Duffy
2
Cleveland State University
,
Cleveland, OH 44115
;
symposium chairman and editor
.
Search for other works by this author on:
ISBN-10:
0-8031-1864-3
ISBN:
978-0-8031-1864-5
No. of Pages:
426
Publisher:
ASTM International
Publication date:
1994

The creep behavior of a hot-pressed silicon nitride was determined in flexure in air at 1200 and 1300°C by monitoring the creep deflection, the specimen curvature and the position of the neutral axis. The resulting data was used to evaluate the steady-state creep rate from the conventional elastic solution, curvature-moment relations and a model accounting for neutral axis shift. Fractography and measurements of specimen compliance before and after testing indicated bulk cracking and a loss of stiffness. The validity of flexural data to determine creep life parameters was considered.

1.
Carroll
,
D. F.
,
Chuang
,
T. J.
, and
Wiederhorn
,
S. M.
, “
A Comparison of Creep Rupture Behavior in Tension and Bending
Ceramic Engineering and Science Proceedings
, Vol.
4
, No.
7–8
,
1988
, pp. 635–649.
2.
Ferber
,
M. K.
,
Jenkins
,
M. G.
, and
Nolan
,
T. A.
Creep -Fatigue Response of Structural Ceramics: I, Comparison of Flexure, Tension, and Compression Testing
,” Proceedings of the 37th Sagamore Army Materials Research Conference,
Viechnicki
D.J.
, Ed.,
1990
, pp. 343–351.
3.
Chuang
,
T. J.
, “
Estimation of Power-Law Creep Parameters From Bend Test Data
,”
Journal of Materials Science
 0022-2461, Vol.
21
,
1986
, pp 165–175.
4.
Chen
,
C. F.
, and
Chuang
,
T.J.
, “
Improved Analysis for Flexural Creep with Application to Sialon Ceramics
,”
Journal of the American Ceramic Society
 0002-7820, Vol.
73
, No.
8
,
1990
, pp. 2366–73.
5.
Hollenberg
,
G. W.
,
Terwilliger
,
G. R.
, and
Gordon
,
R. S.
, “
Calculation of Stress and Strain in Four-Point Bending Creep Tests
,”
Journal of the American Ceramic Society
 0002-7820, Vol.
54
, No.
4
,
1971
, pp. 196–199.
6.
Jakus
,
K.
, and
Wiederhorn
,
S. M.
, “
Creep Deformation of Ceramics in Four-Point Bending
, ”
Journal of the American Ceramic Society
 0002-7820, Vol.
71
, No.
10
,
1988
, pp. 832–836.
7.
Salem
,
J. A.
, and
Choi
,
S. R.
, Ceramic Technology Project Semiannual Progress Report for April 1991 through September 1991, pp 305–319, ORNL/TM-11984,
Oak Ridge National Laboratory
,
1992
.
8.
Nose
T.
and
Fujii
T.
, “
Evaluation of Fracture Toughness for Ceramic Materials by the Single-Edge-Precracked-Beam Method
,”
Journal of the American Ceramic Society
 0002-7820, Vol.
71
, No.
5
,
1988
, pp. 328–333.
9.
Metals Handbook
, ninth edition, Vol.
8
,
1985
, pp. 306.
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