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Meeting MS&T22: Materials Science & Technology
Symposium 50 Years of Characterizing Structural Ceramics and Glasses: Recognizing the Contributions of George Quinn
Presentation Title Observations in Fracture Toughness Testing of Glasses and Optical Ceramics
Author(s) Jonathan Salem
On-Site Speaker (Planned) Jonathan Salem
Abstract Scope Fracture toughness is a critical structural design parameter and an excellent metric to rank structural materials. It determines fracture strength by way of the flaws, both inherent and induced, and defines the endpoint of the slow crack growth (SCG) curve. The fracture toughnesses of glasses and structural and optical ceramics as measured by the techniques in ASTM C1421 are compared. When good metrology is employed, the results are very comparable with two exceptions: materials exhibiting crack growth resistance (R-curve) and those with low SCG exponents. For materials exhibiting R-curves, the result is a function of extension and can be minimized with short cracks. For materials with low SCG exponents, such as glasses, elimination of the corrosive media and/or increasing the stress intensity rate produces consistent results. A summary of values is given for optical materials and glasses. ASTM C1421 is applicable with some modifications.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Quintessential Standards Writer and the Tangible Benefits of Standards
Advanced Proof Testing for Structural Ceramics
Failure Analysis of a Large SiC Component
Failure Analysis of Sub-ballistic Contact in Glass
Fractal Analysis of Brittle Fracture and Crack Branching
Fracture Mechanics Implications of Complex Contact Damage on Measured Strength of Glass
Interpretation of ZerodurŪ Strength Data
Observations in Fracture Toughness Testing of Glasses and Optical Ceramics
On the 3rd Edition of the NIST Guide to Fractography of Ceramics and Glasses
On the Controversies during the Creation of Flexure Strength Standards MIL STD 1942 and ASTM C 1161
On the Elastic Isotropy of the Entropy-stabilized Oxide (Mg, Co, Ni, Cu, Zn)O Compound
Sectored-flexural and Rotational-Flexural-strength Testing of Brittle Material Cylinders and Tubes
Static and Dynamic Compression Strength of Ceramics and Glasses

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