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Compression Test for Steel Stress Strain | Research Spotlight

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Compression Test for Steel Stress Strain | Research Spotlight

Our test machines are often used in materials research. Recently researchers at a major university desired to determine the stress strain properties of small steel samples using an electromechanical test machine. Researchers chose to utilize compression testing methods due to the cylindrical sample geometry. The biggest challenge was the small test sample size (500 micron thick and 1 to 2 mm diameter). Simply placing the sample in the test area on a consistent basis was challenging.

The second challenge of this study was that the modulus of stiffness of steel made high sample deflection or deformation measurement quality difficult to achieve. Ten percent sample strain on a 500 micron sample thickness converts to a measurement range up to 50 microns. Modulus measurements in the elastic range call for accurate measurements of 1 micron.

The third challenge involved the design of the compression fixture to minimize sample misalignment during the test which required approximately 1500 pounds. TestResources aided with placement of the deflectometer, design of the platens, and supply of a mini sub frame so that accurate and precise strain measurements could be made and so that consistent aligned sample loading was ensured.