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首页> 外文期刊>International journal of non-linear mechanics >Modeling deformation induced anisotropy of light-activated shape memory polymers
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Modeling deformation induced anisotropy of light-activated shape memory polymers

机译：建模变形诱导光激活形状记忆聚合物的各向异性

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Light-activated shape memory polymers (LASMPs) are a new generation of active materials that undergo phase transformations upon light irradiation at different wavelength and intensities. This type of material shows much promise in its use in adaptive and shape reconfiguration structures for applications in biomedical and aerospace engineering. LASMPs exhibit nonlinear viscoelastic behavior due to the rearrangements in the macromolecular networks of the polymers when they are mechanically deformed. The deformed configuration can have a different symmetry group than the original undeformed configuration. In this study we assume that the body has multiple natural configurations in order to incorporate the microstructural changes in the viscoelastic polymers due to mechanical loading and light irradiation. We also account for the directional preference of the new network that is formed due to stretching the polymers. In this paper, the constitutive models developed for elastic and viscoelastic LASMPs in our previous work (Yuan and Zhi, 2017; Zhi and Yuan, 2017) are modified to include the changes in the symmetry group of the new network due to mechanically stretching the polymer. The models are implemented within ABAQUS finite element (FE) through the use of user-material subroutines (UMAT).
机译：光活化形状记忆聚合物（LasmP）是在不同波长和强度下照射时经历相变的新产生活性材料。这种类型的材料在其在自适应和形状重新配置结构中使用了许多许多希望在生物医学和航空航天工程中的应用。由于在机械变形时，由于聚合物的大分子网络中的重新排列而表现出非线性粘弹性行为。变形配置可以具有与原始的未变形配置不同的对称组。在该研究中，我们假设主体具有多种自然配置，以便由于机械负载和光照射而掺入粘弹性聚合物中的微观结构变化。我们还考虑了由于拉伸聚合物而形成的新网络的定向偏好。在本文中，在我们以前的工作中为弹性和粘弹性紫砂（Yuan和Zhi，2017）开发的本构模型被修改为包括机械拉伸聚合物的新网络对称组的变化。通过使用用户材料子程序（UMAT），该模型在ABAQUS有限元（FE）中实现。

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