Continuum mechanical modeling of strain-induced crystallization in polymers
Continuum mechanical modeling of strain-induced crystallization in polymers
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DOI：
10.1016/j.ijsolstr.2020.04.017
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发表时间：
2020-07-01
影响因子：
3.6
通讯作者：
Klinge, Sandra
中科院分区：
文献类型：
--
作者：
Ayguen, Serhat;Klinge, Sandra
目前的贡献集中在非填充聚合物中应变诱导结晶的热力学一致的力学建模。这种现象对于聚合物的机械性能及其制造和应用具有特别重要的意义。该模型采用耗散势最小原则，并假设两个内部变量：结晶变形和网络的规则性。除了推导演化方程所需的耗散势外，还选择了已建立的Arruda-Boyce模型来描述聚合物的弹性行为。该模型的两个特点是随应力状态的演化方向和加载和卸载阶段结晶的区别。将该模型应用于有限元方法中，对不同初始构型试样在循环拉伸试验中晶体区域的生长和收缩进行了数值模拟。该概念使微观结构演变的可视化，产生的信息，仍然是无法通过实验技术。(C) 2020 Elsevier Ltd.版权所有。
The present contribution focuses on the thermodynamically consistent mechanical modeling of the strain-induced crystallization in unfilled polymers. This phenomenon is of particular importance for the mechanical properties of polymers as well as for their manufacturing and the application. The model developed uses the principle of the minimum of dissipation potential and assumes two internal variables: the deformations due to crystallization and the regularity of the network. In addition to the dissipation potential necessary for the derivation of evolution equations, the well-established Arruda-Boyce model is chosen to depict the elastic behavior of the polymer. Two special features of the model are the evolution direction depending on the stress state and the distinction of crystallization during the loading and unloading phase. The model has been implemented into the finite element method and applied for numerical simulation of the growth and shrinkage of the crystal regions during a cyclic tension test for samples with different initial configurations. The concept enables the visualization of the microstructure evolution, yielding information that is still inaccessible by experimental techniques. (C) 2020 Elsevier Ltd. All rights reserved.