Materials Research for Advanced Inertial Instrumentation. Task 1: Dimensional Stability of Gyro Structural Materials.
Technical rept. no. 1, 1 Oct 77-30 Sep 78,
CHARLES STARK DRAPER LAB INC CAMBRIDGE MA
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The literature is reviewed for micromechanical property data for materials used in precision instruments. Microyield strength and microcreep values are presented for general aluminum alloys, 440C stainless steel, and instrument grade beryllium. A method for applying finite element analysis techniques in conjunction with empirical data for instrument grade beryllium to predict micromechanical behavior of instrument components is discussed. A simple component configuration for experimental verification of the prediction technique is presented. The application of finite element techniques to the design of a composite microcreep specimen is presented. The results of preliminary work on studies of micromechanical properties of hot isostatically pressed beryllium are presented. Test specimen preparation, microstrain instrumentation, and problems of alignment of loading are discussed. Author
- Metallurgy and Metallography