Uniaxial Compression Test Using Strain Gauge

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Experiment Title Uniaxial Compression Test using Strain Gauge Objective To understand and investigate the mechanical properties of an Aluminum alloy using strain gauge in compression test. Introduction The uniaxial test is the most widely used mechanical testing process for characterising solid material behaviour. It is a simple and versatile method for determining material properties in almost all kinds of material applications. Uniaxial tests are also employed to study localised deformation behaviour, in this case we are studying strain distribution around a notch in a specimen .The uniaxial compression test is conducted by taking a right cylinder of aluminium alloy ,loading it along its axis and recording the displacement produced as the forced as the force is increased. In Figure 1and Figure 2 we present a typical record of such a test, note that the force and the displacement have been scaled respectively to stress (by dividing by the original cross-sectional area of the specimen) and to strain (by dividing by the original length). Figure 1: The complete stress-strain curve illustrating various mechanical parameters σ Figure 2: A right cylinder of aluminum alloy, loading it along its axis σ Experimental Procedures 1. The cylindrical Aluminum alloy test specimen piece was put on the Universal compression Tester together with a rigid spacer. It was make sure to position them in the center of the pressure plates of the machine. 2. Those wires are attached with the strain gauge. The Aluminum alloy was face the front and wire was connected to the strain gauge is not tangled with the machinery. 3. The gap between the pressure plates was closed until their platforms are touching while the gauge on the compression tester showed 0 kN . 4. Computer was switched on and it is connected the DBU-120A unit to the PC with the USB

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