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基于数值模拟的可生物降解聚乳酸（PLA）热成型优化

Optimisation on Thermoforming of Biodegradable Poly (Lactic Acid) (PLA) by Numerical Modelling.

作者信息

Wei Huidong

机构信息

College of Health and Life Sciences, Aston University, Birmingham B4 7ET, UK.

Rayner Intraocular Lenses Limited, Worthing BN14 8AQ, UK.

出版信息

Polymers (Basel). 2021 Feb 22;13(4):654. doi: 10.3390/polym13040654.

DOI:10.3390/polym13040654
PMID:33671769
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7926767/
Abstract

Poly (lactic acid) (PLA) has a broad perspective for manufacturing green thermoplastic products by thermoforming for its biodegradable properties. The mechanical behaviour of PLA has been demonstrated by its strong dependence on temperature and strain rate at biaxial deformation. A nonlinear viscoelastic model by the previous study was employed in a thermoforming process used for food packaging. An optimisation approach was developed by achieving the optimal temperature profile of specimens by defining multiple heating zones based on numerical modelling with finite element analysis (FEA). The forming process of a PLA product was illustrated by modelling results on shape evolution and biaxial strain history. The optimal temperature profile was suggested in scalloped zones to achieve more even thickness distribution. The sensitivity of the optimal results was addressed by checking the robustness under perturbation.

摘要

聚乳酸（PLA）因其可生物降解特性，在通过热成型制造绿色热塑性产品方面具有广阔前景。PLA的力学行为已通过其在双轴变形时对温度和应变速率的强烈依赖性得到证明。先前研究中的一个非线性粘弹性模型被应用于食品包装的热成型过程。通过基于有限元分析（FEA）的数值模拟定义多个加热区来实现试样的最佳温度分布，从而开发了一种优化方法。通过对形状演变和双轴应变历史的建模结果说明了PLA产品的成型过程。建议在扇形区域采用最佳温度分布以实现更均匀的厚度分布。通过检查扰动下的稳健性来解决最佳结果的敏感性问题。

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