A rosette strain gage is an electromechanical device that can measure relative surface elongations in three directions.

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A rosette strain gage is an electromechanical device that can measure relative surface elongations in three directions. Bonding such a device to the surface of a structure allows determination of elongational strains in particular directions. A schematic of one such gage is shown in the following figure, and the output of the device will provide data on the strains along the gage arms a, b, and cDuring one application, it is found that ea = 0.001, eb = 0.002, and ec = 0.004. Using the two-dimensional strain transformation relations, calculate the surface strain components ex, ey, and exy.

y 60 b m m 60 mmm X a

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