Los coeficientes de anisotropia son una medida util para caracterizar la capacidad de una chapa a... more Los coeficientes de anisotropia son una medida util para caracterizar la capacidad de una chapa a ser embutida. En particular, en chapas de acero galvanizado de bajo carbono, los coeficientes de Lankford (R) exhiben valores maximos de entre 1.55 - 1.90 en las direcciones de laminado y transversal respectivamente. Para inclinaciones de 45 grados respecto de la direccion de laminado su valor se reduce a aproximadamente 1.20. Los valores de R obtenidos muestran una asimetria en dispersion en funcion del angulo de inclinacion de la probeta respecto la direccion de laminado. Esta dispersion es marcadamente mayor en la direccion de laminado y en la direccion transversal, respecto a una inclinacion de 45 grados. El desvio standard observado es de 0.15 y 0.11 para las direcciones longitudinal y transversal respectivamente. El minimo valor de 0.05 se observa a 45 grados. Utilizando un modelo de plasticidad cristalina se predice el perfil de los coeficientes de Lankford en funcion del angulo ...
The processing technology of low carbon steels for deep drawing applications has been focused on ... more The processing technology of low carbon steels for deep drawing applications has been focused on developing processes that resulted in increased intensity in the crystallographic orient ations of texture close to the gamma fiber {111} . This trend had its origins in research based on numerical simulations of crystal plasticity. Such works assessed the individual influence of each texture component on the typical indicators of drawability: Rm (normal anisotropy) and ? R (planar anisotropy). In order to evaluate the influence of crystallographic orientati on distribution on Rm and ? R , simulations for uniaxial tensile tests in 32 different virtual materials were perfo rmed by means of a self-consistent crystal plasticity model followed by a post- process based on factorial analysis. The latter was used to estimate the magnitude of the coupled effects caused by the presence of the considered texture components. In agreement with previous res earch, it was verified that a high intensit...
The Forming Limit Diagrams (FLDs) of textured polycrystalline sheet metals were investigated usin... more The Forming Limit Diagrams (FLDs) of textured polycrystalline sheet metals were investigated using micro-macro averaging and two types of grain-interaction models: Full-Constraint (FC) and Self-consistent (SC) schemes, in conjunction with the Marciniak–Kuczynski (MK) approach. By referring to previous FLD studies based on the FC-Taylor model ─ Wu and coworkers [Effect of an initial cube texture on sheet metal formability, Materials Science and Engineering A, 364:182–7, 2004] and Inal and coworkers [Forming Limit comparison for FCC and BCC sheets, International Journal of Plasticity, 21:1255-1266, 2005] ─ we found that the MK-FC strategy leads to unrealistic results. In the former case, the researchers found that an increasing spread about the cube texture produces unexpectedly high limit strains. In the latter work, Inal et al. predicted a remarkably low forming-limit curve for a FCC material and an extremely high forming-limit curve for a BCC material, in the biaxial-stretching ran...
Los coeficientes de anisotropia son una medida util para caracterizar la capacidad de una chapa a... more Los coeficientes de anisotropia son una medida util para caracterizar la capacidad de una chapa a ser embutida. En particular, en chapas de acero galvanizado de bajo carbono, los coeficientes de Lankford (R) exhiben valores maximos de entre 1.55 - 1.90 en las direcciones de laminado y transversal respectivamente. Para inclinaciones de 45 grados respecto de la direccion de laminado su valor se reduce a aproximadamente 1.20. Los valores de R obtenidos muestran una asimetria en dispersion en funcion del angulo de inclinacion de la probeta respecto la direccion de laminado. Esta dispersion es marcadamente mayor en la direccion de laminado y en la direccion transversal, respecto a una inclinacion de 45 grados. El desvio standard observado es de 0.15 y 0.11 para las direcciones longitudinal y transversal respectivamente. El minimo valor de 0.05 se observa a 45 grados. Utilizando un modelo de plasticidad cristalina se predice el perfil de los coeficientes de Lankford en funcion del angulo ...
The processing technology of low carbon steels for deep drawing applications has been focused on ... more The processing technology of low carbon steels for deep drawing applications has been focused on developing processes that resulted in increased intensity in the crystallographic orient ations of texture close to the gamma fiber {111} . This trend had its origins in research based on numerical simulations of crystal plasticity. Such works assessed the individual influence of each texture component on the typical indicators of drawability: Rm (normal anisotropy) and ? R (planar anisotropy). In order to evaluate the influence of crystallographic orientati on distribution on Rm and ? R , simulations for uniaxial tensile tests in 32 different virtual materials were perfo rmed by means of a self-consistent crystal plasticity model followed by a post- process based on factorial analysis. The latter was used to estimate the magnitude of the coupled effects caused by the presence of the considered texture components. In agreement with previous res earch, it was verified that a high intensit...
The Forming Limit Diagrams (FLDs) of textured polycrystalline sheet metals were investigated usin... more The Forming Limit Diagrams (FLDs) of textured polycrystalline sheet metals were investigated using micro-macro averaging and two types of grain-interaction models: Full-Constraint (FC) and Self-consistent (SC) schemes, in conjunction with the Marciniak–Kuczynski (MK) approach. By referring to previous FLD studies based on the FC-Taylor model ─ Wu and coworkers [Effect of an initial cube texture on sheet metal formability, Materials Science and Engineering A, 364:182–7, 2004] and Inal and coworkers [Forming Limit comparison for FCC and BCC sheets, International Journal of Plasticity, 21:1255-1266, 2005] ─ we found that the MK-FC strategy leads to unrealistic results. In the former case, the researchers found that an increasing spread about the cube texture produces unexpectedly high limit strains. In the latter work, Inal et al. predicted a remarkably low forming-limit curve for a FCC material and an extremely high forming-limit curve for a BCC material, in the biaxial-stretching ran...
Uploads
Papers by Mariano Serenelli