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1 November 1990 Residual stresses in single-point machined beryllium
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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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Harry A. Moreen and Iwao P. Adachi "Residual stresses in single-point machined beryllium", Proc. SPIE 1335, Dimensional Stability, (1 November 1990);

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