Deep stretch of polyethylene by transverse loading: Finite element simulation to characterize the influence of indenter size and loading speed on the stress development and distribution,Polymer Engineering and Science

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Deep stretch of polyethylene by transverse loading: Finite element simulation to characterize the influence of indenter size and loading speed on the stress development and distribution
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-08-03 , DOI: 10.1002/pen.25762
Azadeh Ebrahimian ₁ , Patrick Ward ₁ , P.‐Y. Ben Jar ₁

Affiliation

Deep stretching has been found to decrease the cracking resistance of polyethylene (PE) in an aggressive environment. This idea has been adopted for developing a test method that uses indentation loading to generate a deep stretch of a PE plate so that time for crack generation is shortened. Work presented is to use finite element (FE) modeling to investigate the influence of indenter size and loading speed on the efficacy of the test method. Mechanical testing was carried out using cylindrical indenters of 7 and 13 mm in diameter on a plate that is supported so that only a 15-mm diameter area can be stretched. Test results were used to calibrate material input data for the FE modeling and to establish the stress development and distribution during the deep stretch process. FE modeling considered three types of material input, one purely based on elastic–plastic deformation and the other two considering creep or damage during the deep stretch. All FE modellings suggest that the 13-mm indenter is more effective than the 7-mm indenter in introducing a monotonic total stress increase during the deep stretch, and thus the study concludes that the former should be used to introduce the deep stretch.

中文翻译：

通过横向加载对聚乙烯进行深度拉伸：有限元模拟以表征压头尺寸和加载速度对应力发展和分布的影响

已发现深度拉伸会降低聚乙烯 (PE) 在侵蚀性环境中的抗裂性。这一想法已被用于开发一种测试方法，该方法使用压痕载荷来产生 PE 板的深度拉伸，从而缩短裂纹产生的时间。所提出的工作是使用有限元 (FE) 建模来研究压头尺寸和加载速度对测试方法有效性的影响。机械测试使用直径为 7 和 13 毫米的圆柱形压头在支撑的板上进行，因此只能拉伸 15 毫米直径的区域。测试结果用于校准有限元建模的材料输入数据，并确定深度拉伸过程中的应力发展和分布。有限元建模考虑了三种类型的材料输入，一种纯粹基于弹塑性变形，另两种考虑深度拉伸过程中的蠕变或损坏。所有有限元模型都表明，在深度拉伸过程中引入单调总应力增加方面，13 毫米压头比 7 毫米压头更有效，因此研究得出结论，应该使用前者来引入深度拉伸。

更新日期：2021-09-06

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