Analysis of strain gage data from submarine MSW piping.
Koch, Joseph William Jr.
Brock, John E.
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This thesis presents a procedural sequence for processing and assessing the integrity of experimental strain gage data taken on piping in which gage rosettes are arranged in circumferential patterns at several sections of a piping system. The method of least squares is used to obtain "best" values for strain per unit loading for each gage element. This data is used to find principal stresses and values of normal and shearing stress on a normal cross section at each rosette location. The data is then smoothed to obtain normal and shearing stress as functions of angular position for each ring of rosettes. A computer program has been devised to perform these operations and provide a graphical output to assess degree of fit with experimental data. Finally, manual computation is employed to study the equilibrium of various segments of the piping in evaluating the overall integrity of the data. This procedure and program have been used in evaluating tests performed on the main seawater piping system of the USS Benjamin Franklin (SSBN 640). Some results of the dockside hydrostatic tests are presented herein for purposes of illustration.
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