Evaluation of viscoelastic non-isochoric plastic behavior of PBT and PA6

Evaluation of viscoelastic non-isochoric plastic behavior of PBT and PA6
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PBT 和 PA6 的粘弹性非等容塑性行为评价

DOI:
10.1007/s11043-022-09552-1
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发表时间:
2022
影响因子:
2.5
通讯作者:
Sakai Takenobu
Sakai Takenobu
中科院分区:
材料科学3区
文献类型:
--
作者:
Sato Yoshihiko;Masumizu Sayaka;Sakaue Kenichi;Koyanagi Jun;Ohtani Akio;Sakai Takenobu

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本文研究了聚对苯二甲酸丁二醇酯(PBT)和聚酰胺6(PA6)两种热塑性塑料的非等容塑性行为。在温度控制条件下进行单轴拉伸试验,并通过数字图像相关(DIC)测量纵向和横向应变来评估泊松比和体积应变。此外,由粘弹性和非等容塑性模型组成的力学模型在有限元软件中实现,并应用于模拟单轴拉伸试验中的力学行为。两种热塑性塑料的试验结果表明,塑性变形时的泊松比小于0.5。通过与试验结果和有限元分析结果的对比,发现体积应变的变化规律与非等容塑性有限元分析结果吻合较好。这些事实意味着PBT和PA6的塑性行为是非等容的。
The present study investigates the non-isochoric plastic behavior of two thermoplastics, polybutylene terephthalate (PBT) and polyamide 6 (PA6). The uniaxial tensile tests under temperature-controlled conditions are performed and Poisson’s ratio and volumetric strain are evaluated through the measurement of the longitudinal and transverse strains by digital image correlation (DIC). In addition, a mechanical model consisting of a viscoelastic and a non-isochoric plastic model is implemented in finite element software and applied to simulate the mechanical behavior in the uniaxial tensile test. The test results of the both thermoplastics show that the Poisson’s ratio during plastic deformation is less than 0.5. Compared to the test result with the finite element analysis, it is found that the variation of the volumetric strain is in good agreement with the finite element analysis assuming non-isochoric plasticity. These facts mean that the plastic behavior of PBT and PA6 is non-isochoric.
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