Modelo de material para perfiles conformado en frío de sección transversal UV de acero A572, para espesores de 10 mm y 12 mm

Abstract

The cold forming process generates an amount of residual stresses due to the presence of dislocations in the structure that produces an increase in the internal energy of the material. Currently, cold-formed steels have had a wide growth in the market due to their lighter weight, ease of forming and better mechanical properties. With the advances in technology, the behavior of complete sections can be studied in greater detail. The mechanical behavior of ASTM A572 grade 50 steel was studied, due to the cold forming process of the UV type section for 10 and 12 mm thickness. To evaluate the mechanical properties, specimens were obtained by water jet cutting, since they do not undergo stresses or thermal loads. Then, the hardness variability along the UV section was evaluated both in the internal and external part. Finally, the affected parts and the distance of the onset of residual stresses were identified through the visualization of the modification of the grain size. The results of the study by the cold forming process of UV type section for 10 and 12 mm thickness, show that there is a significant increase of the yield stress, a reduction of the ductility and there is no significant difference of the modulus of elasticity. In addition, the variability of Brinell hardness and grain affectation was determined at 1.1 times the plate thickness from the end of the curve.