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By far the most often used property is the metals’ ability to sustain the load while it is put under tensile strain. During testing, it is determined by the sustained load at which the test specimen breaks or the metal has lost its elasticity and entered in the Plastic state and deformed. This value is divided by the cross-section of the specimen being tested to obtain the Ultimate Tensile Strength (UTS) of the metal under test. The Figure 2.1 below is the tensile test graph of typical mild steel, it indicates the key points of mechanical behavior during the testing.

Figure 2.1 A typical strain and stress diagram, describing various elements of tensile test.