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May/June 2008
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Testing of Round Specimens Allowed for in New Ceramics Standard

Four-point fixture

Four-point fixture with cradles to distribute load onto a glass rod specimen. The fixture spans are 40 mm x 80 mm wide and the loading roller diameter is 6 mm.

Ceramic and glass companies, as well as universities and government laboratories, will be the primary users of a new standard that allows for the flexural strength determination of components made in a round shape or after finish machining with minimal waste. The standard, C1684, Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature-Cylindrical Rod Strength, was developed by Subcommittee C28.01 on Mechanical Properties and Performance, part of ASTM International Committee C28 on Advanced Ceramics.

“Users will now be able to test round-shaped specimens with more confidence and there will be no need to re-machine specimens into rectangular cross section shapes as specified in other ceramic strength standards,” says George Quinn, ceramic engineer, National Institute of Standards and Technology and past chairman of Committee C28. The standard describes the apparatus, specimen requirements, test procedures, calculations and reporting requirements necessary for the test.

Quinn says that participation from all interested parties in C28.01’s activities is welcome, particularly from microelectronics companies concerned with strength and reliability problems. “The subcommittee is venturing into adopting procedures for miniature test specimens for microelectrical machine systems and even nanoscale-sized structures,” says Quinn.

CONTACT

Technical Information: George Quinn, National Institute of Standards and Technology, Gaithersburg, Md.

Phone: 301/975-5334

ASTM Staff: Joe Koury

Phone: 610/832-9804