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聚碳酸酯板材成形极限的测定

On the Determination of Forming Limits in Polycarbonate Sheets.

作者信息

Rosa-Sainz Ana, Centeno Gabriel, Silva Maria Beatriz, López-Fernández Jose Andrés, Martínez-Donaire Andrés Jesus, Vallellano Carpoforo

机构信息

Department of Mechanical and Manufacturing Engineering, University of Seville, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain.

IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.

出版信息

Materials (Basel). 2020 Feb 19;13(4):928. doi: 10.3390/ma13040928.

DOI:10.3390/ma13040928
PMID:32093044
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7078885/
Abstract

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.

摘要

通过提出一种对金属成型中常用方法的改编，本文旨在提供一种确定聚合物板材通过颈缩和断裂的成型极限的通用程序。实验工作通过具有不同几何形状的 Nakajima 试样进行，以获取 1 毫米厚聚碳酸酯板材在拉伸、平面、双轴和等双轴状态下的应变。尽管聚合物板材具有典型的稳定颈缩扩展，但已表明应用金属中使用的时间相关和平谷方法来表征颈缩的开始并获得聚碳酸酯的成型极限是合适的。通过分析垂直于裂纹的截面处应变路径的演变，可以更深入地了解稳定颈缩扩展行为以及将金属方法应用于聚合物。由于聚合物板材典型的显著弹性恢复，在断裂前的最后阶段考虑 DIC 系统的主应变，增强了断裂应变的测定。作为该分析的结果，获得了聚碳酸酯板材准确的颈缩和断裂成型极限以及主应变空间，为分析断裂极限知识相关的增量板材成型过程提供了一个通用框架。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/53ebe0cc9255/materials-13-00928-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/7d85330ec253/materials-13-00928-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/0989392ad400/materials-13-00928-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/78da0573ceaa/materials-13-00928-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/0f2b0f3269e4/materials-13-00928-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/4a9e5a1d432b/materials-13-00928-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/f8cab9e04cf3/materials-13-00928-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/cfdf90db346a/materials-13-00928-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/78a496d2af8a/materials-13-00928-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/53ebe0cc9255/materials-13-00928-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/7d85330ec253/materials-13-00928-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/0989392ad400/materials-13-00928-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/78da0573ceaa/materials-13-00928-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/0f2b0f3269e4/materials-13-00928-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/4a9e5a1d432b/materials-13-00928-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/f8cab9e04cf3/materials-13-00928-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/cfdf90db346a/materials-13-00928-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/78a496d2af8a/materials-13-00928-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/aa24/7078885/53ebe0cc9255/materials-13-00928-g009.jpg

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本文引用的文献

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2
Process Parameter Effects on Biocompatible Thermoplastic Sheets Produced by Incremental Forming.工艺参数对增量成型制备的生物相容性热塑性板材的影响
Materials (Basel). 2018 Aug 8;11(8):1377. doi: 10.3390/ma11081377.
Polymers (Basel). 2023 Aug 27;15(17):3560. doi: 10.3390/polym15173560.
4
Optimization of Single-Point Incremental Forming of Polymer Sheets through FEM.通过有限元法优化聚合物板材单点渐进成形
Materials (Basel). 2023 Jan 3;16(1):451. doi: 10.3390/ma16010451.