On the Determination of Forming Limits in Polycarbonate Sheets
| Autor: | Carpóforo Vallellano, Maria Beatriz Silva, J. A. López-Fernández, Gabriel Centeno, A.J. Martínez-Donaire, Ana Rosa-Sainz |
|---|---|
| Přispěvatelé: | Universidad de Sevilla. Departamento de Ingeniería Mecánica y de Fabricación, Gobierno de España, Fundação para a Ciência e a Tecnologia. Portugal |
| Rok vydání: | 2020 |
| Předmět: |
polymer sheet forming
0209 industrial biotechnology Materials science necking Polymer sheet forming 02 engineering and technology lcsh:Technology Article formability limits 020901 industrial engineering & automation Ultimate tensile strength Perpendicular Formability General Materials Science Polycarbonate Composite material lcsh:Microscopy lcsh:QC120-168.85 lcsh:QH201-278.5 lcsh:T Plane (geometry) Necking 021001 nanoscience & nanotechnology Fracture polycarbonate lcsh:TA1-2040 fracture Formability limits visual_art Fracture (geology) visual_art.visual_art_medium lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:TK1-9971 Incremental sheet forming |
| Zdroj: | Materials Volume 13 Issue 4 idUS: Depósito de Investigación de la Universidad de Sevilla Universidad de Sevilla (US) Materials, Vol 13, Iss 4, p 928 (2020) idUS. Depósito de Investigación de la Universidad de Sevilla Colegio Oficial de Psicólogos de Madrid |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma13040928 |
| Popis: | 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 di erent 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. Gobierno de España DPI2015-64047-R Gobierno de España PGC2018-095508-B-I00 Fundación para la Ciencia y Tecnología de Portugal UIDB / 50022/2020 |
| Databáze: | OpenAIRE |
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