Fracture toughness of TiB{sub 2} and B{sub 4}C using the single-edge precracked beam, indentation strength, chevron notched beam, an indentation strength methods
- Alfred Univ., NY (United States). New York State College of Ceramics
- Los Alamos National Lab., NM (United States). Materials Science and Technology Division
The mode I fracture toughness (K{sub Ic}) of boron carbide (B{sub 4}C) and titanium diboride (TiB{sub 2}) was determined using four competing techniques. The indentation strength (IS), chevron notched beam (CNB), and indentation fracture (IF) methods are common techniques that were compared to the recently standardized single-edge precrack beam (SEPB) method. The SEPB method was more difficult to apply, but it represent the most rigorous method for K{sub Ic} determination, because it uses few assumptions and requires a direct measurement of crack length. The IS method was an expeditious and economical alternative when low indentation loads were used. CNB K{sub Ic} values were virtually rate-independent when displacement rates less than or equal to 0.5 mm/min were used. The IF method was the least satisfactory technique, because of high variability in K{sub c} values and because of the low differentiation between the two materials studied.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 106011
- Journal Information:
- Journal of the American Ceramic Society, Vol. 78, Issue 8; Other Information: PBD: Aug 1995
- Country of Publication:
- United States
- Language:
- English
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