Exercices d'application du forgeage de pièces mécaniques

At 4% and 8% elongation, the loads on a tensile test-piece of half-hard aluminium alloy are 1.59 kN and 1.66 kN respectively. The test-piece has an initial width = 10 mm, thickness = 1.4mm and gauge length =50 mm. Determine the coefficient K (MPa) if the hardening n = 0.12 of the elastoplastic behavior model σ = K εⁿ