Residual stresses in single-point machined beryllium

Harry A. Moreen; Iwao P. Adachi

doi:10.1117/12.22868

1 November 1990 Residual stresses in single-point machined beryllium

Harry A. Moreen, Iwao P. Adachi

Proceedings Volume 1335, Dimensional Stability; (1990) https://doi.org/10.1117/12.22868
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

A single-point turned (SPT) beryllium surface has been evaluated for manifestations of surface damage which could lead to dimensional instability. Surface fissures, residual stress and crystallographic changes have been observed. Measurements of the residual , stresses have been made using a variation of the Treuting-Read Method wherein deformations associated with the progressive removal of surface layers are used to estimate the residual stresses. In this case, the deformations have been measured interferometrically on the reverse surface of the single-point turned disk. Residual stresses of 40,000 psi were observed at the machined surface. At a depth of 120 microinches, the residual stresses are negligible.

Citation Download Citation

Harry A. Moreen and Iwao P. Adachi "Residual stresses in single-point machined beryllium", Proc. SPIE 1335, Dimensional Stability, (1 November 1990); https://doi.org/10.1117/12.22868

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