Abstract
IT is interesting, in the study of experimental I work on the properties of engineering materials, to trace the general trend of the design of apparatus for research, as the need of more accurate knowledge has arisen. Much of our fundamental knowledge of materials has been gained from the study of strains in wires, bars and beams, under uniform conditions of loading; and the experimental apparatus employed has generally made these conditions necessary. The bulk of the technical problems which still require solution are, however, those in which the internal stress varies enormously from point. to point; and hence the strain-measuring apparatus now employed in researches has been so increased delicacy that it is possible to obtain average measurements over very small distances which approximate, if they cannot reach, to the measure ment of the strain at a point.
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References
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âœThe Optical Determination of Stress.â By E. G. Coker, Phil. Mag., 1910.
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COKER, E. The Application of Optical Methods to Technical Problems of Stress Distribution. . Nature 90, 383–386 (1912). https://doi.org/10.1038/090383a0
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DOI: https://doi.org/10.1038/090383a0