Chemo-thermomechanical ageing of elastomers based on multiphase continuum mechanics
Chemo-thermomechanical ageing of elastomers based on multiphase continuum mechanics
复制标题
基于多相连续介质力学的弹性体化学热机械老化
DOI：
10.1007/s00161-012-0255-8
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发表时间：
2013
影响因子：
2.6
通讯作者：
A. Lion
中科院分区：
文献类型：
--
作者：
M. Johlitz;A. Lion
本文涉及弹性体中发生的化学老化过程之一的本构表示，即化学热机械老化，当介质扩散到不同的固体中时，化学热机械老化会作为不可逆的、延时的化学反应发生。该过程在有限厚度的部件中是不均匀的，并且由于它可以被热激活，因此随着温度的升高老化会加速。将多相连续介质力学应用于这些基本特性，可以制定热力学耦合材料模型，该模型不仅能够描述粘弹性，而且能够描述聚合物网络中发生的化学分解和重组过程。利用Liu-Müller演化原理评价所获得模型的热力一致性。随后，应用有限元方法求解所得的偏方程组，这对应于耦合多场问题。本文以令人信服的示例模拟作为结尾。
This article concerns the constitutive representation of one of the chemical ageing processes that occur in elastomers, chemo-thermomechanical ageing, which takes place as an irreversible, time-delayed chemical reaction when a medium diffuses into an unlike solid. This process is inhomogeneous in component parts of finite thickness, and as it can be thermally activated, ageing is accelerated on an increase in temperature. The application of multiphase continuum mechanics to these basic characteristics enables a thermodynamically coupled material model to be formulated, which is able to describe not only the viscoelasticity, but also the chemical decomposition and reformation processes that occur in the polymer network. The evolution principle of Liu-Müller is used to evaluate the thermomechanical consistency of the model obtained. Subsequent to this, the finite element method is applied to solve the resulting set of partial equations, which corresponds to a coupled multifield problem. The article closes with convincing simulations of illustrative examples.