SYMPOSIA PAPER Published: 01 January 1981
STP28301S

Specimen Size Effects in Fracture Toughness Testing of Heterogeneous Ceramics by the Notch Beam Method

Source

The variation of apparent KIc with crack length is being studied using a variety of commercial ceramic materials. Test methodology is much the same as has been used in the past for natural rock (notched bend test). Where sufficiently definitive data have been obtained, each material showed decreasing KIc with decreasing crack length with all values falling below KIc determined using constant K specimens (double torsion or constant-moment-arm tests).

Included in the study was soda-lime glass because it was anticipated that no size effect would occur. Large variations (a factor of two) did occur, however, differing in that all values were above constant K specimen KIc. Post-mortem fracture surface examination revealed problems that can occur where a specimen-wide sharp crack is not achieved before testing.

Author Information

McKinney, KR
Ceramics Branch, Naval Research Laboratory, Washington, D.C.
Rice, RW
Ceramics Branch, Naval Research Laboratory, Washington, D.C.
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: E08
Pages: 118–126
DOI: 10.1520/STP28301S
ISBN-EB: 978-0-8031-4811-6
ISBN-13: 978-0-8031-0731-1