Mechanical evaluation of yttria

Daniel C. Harris; W. R. Compton; Alice M. Harper; George Hayes; Marian E. Hills; Nancy A. Jaeger; Larry D. Sawyer; Richard C. Scheri; James L. Stokes

doi:10.1117/12.22478

1 October 1990 Mechanical evaluation of yttria

Daniel C. Harris, W. R. Compton, Alice M. Harper, George Hayes, Marian E. Hills, Nancy A. Jaeger, Larry D. Sawyer, Richard C. Scheri, James L. Stokes

Author Affiliations +

Proceedings Volume 1326, Window and Dome Technologies and Materials II; (1990) https://doi.org/10.1117/12.22478
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

A method is described to make multiple measurements of the strength of a single hemispherical ceramic dome with a ring-on-ring flexure test of disklike sections removed from the dome by a core drill. Preliminary results show that dome cores exhibit lower strength than flat disks, because the domes have larger critical surface flaws than those present on disks. Careful attention to polishing of domes is required to realize maximum strength from the domes. The fracture toughness of optical quality yttria disks and hemispherical domes was found to be approximately 0.7 MPa'I m.

Citation Download Citation

Daniel C. Harris, W. R. Compton, Alice M. Harper, George Hayes, Marian E. Hills, Nancy A. Jaeger, Larry D. Sawyer, Richard C. Scheri, and James L. Stokes "Mechanical evaluation of yttria", Proc. SPIE 1326, Window and Dome Technologies and Materials II, (1 October 1990); https://doi.org/10.1117/12.22478

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