RT Journal Article
T1 On the Determination of Forming Limits in Polycarbonate Sheets
A1 Rosa-Sainz, Ana
A1 Centeno Báez, Gabriel
A1 Silva, María Beatriz
A1 López Fernández, José Andrés
A1 Martínez Donaire, Andrés Jesús
A1 Vallellano Martín, Carpóforo
K1 Polímeros
K1 Materiales - Fatiga
AB By proposing an adaptation of the methodology usually used in metal forming, this paper aims to provide a general procedure for determining the forming limits, by necking and fracture, of polymeric sheet. The experimental work was performed by means of Nakajima specimens with different geometries to allow to obtain strains in the tensile, plane, biaxial and equibiaxial states for Polycarbonate sheet with 1 mm of thickness. The application of the time-dependent and flat-valley approaches used in metals has been revealed appropriate to characterize the onset of necking and obtain the forming limits of polycarbonate, despite the stable necking propagation typical of polymeric sheets. An analysis of the evolution of the strain paths along a section perpendicular to the crack allowed for a deeper understanding of the steady necking propagation behaviour and the adoption of the methodology of metals to polymers. The determination of the fracture strains was enhanced with the consideration of the principal strains of the DIC system in the last stage, just before fracture, due to the significant elastic recovery typical of polymeric sheets. As a result of this analysis, accurate formability limits by necking and fracture are obtained for polycarbonate sheet, together with the principal strain space, providing a general framework for analysing incremental sheet forming processes where the knowledge of the fracture limits is relevant.
PB MDPI
YR 2020
FD 2020-02-19
LK https://hdl.handle.net/10630/46372
UL https://hdl.handle.net/10630/46372
LA eng
NO Rosa-Sainz, A., Centeno, G., Silva, M.B., López-Fernández, J.A., Martínez-Donaire, A.J., y Vallellano, C. (2020). On the Determination of Forming Limits in Polycarbonate Sheets. Materials, 13(4), 928. https://doi.org/10.3390/ma13040928
NO Spanish Government
NO Fundação para a Ciência e a Tecnologia de Portugal
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 5 may 2026