This test was repeated three times for
more accuracy. Fig. 2 shows stress–strain curves of these three tests.
Average mechanical properties of St14 from tensile tests are summarized
in Table 1. These mechanical properties are Yield Stress (YS),
Ultimate Tensile Strength (UTS), work hardening exponent (n), work
hardening coefficient and elongation. Hollomon's equation (σ¼Kεn
)
was used to model the plastic behavior of sheet material.