Sambale Anna Katharina, Stanko Michael, Emde Jessica, Stommel Markus
Institute of Polymer Materials, Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, D-01069 Dresden, Germany.
Chair of Plastics Technology, TU Dortmund University, Leonard-Euler Str. 5, D-44227 Dortmund, Germany.
Polymers (Basel). 2021 May 4;13(9):1480. doi: 10.3390/polym13091480.
Polyamide 6 (PA6) is known to absorb water from its environment due to its chemical structure. This water absorption leads to a change in the mechanical properties as well as an increase in volume (swelling) of the polyamide. In the present work, the sorption and swelling behaviour of polyamide 6 in different conditioning environments was experimentally investigated on different part geometries to develop a finite element (FE) method on the basis of the measured data that numerically calculates the sorption and swelling behaviour. The developed method includes two analyses using the Abaqus software. Both the concentration-dependent implementation of the simulation parameters and the calculation of swelling-induced stresses are performed. This enables the modelling of the sorption curves until maximum saturation is reached and the simulation of the characteristic S-shaped swelling curves. Therefore, the developed methodology represents an efficient method for predicting the sorption and swelling behaviour of polyamide 6 parts during conditioning in a water bath. The determined properties provide the basis for the development of an FE-based simulation environment to take moisture absorption into account during the part design. This enables the calculation of moisture-induced swelling processes and the resulting initial stresses in a given part.
聚酰胺6（PA6）因其化学结构而会从周围环境中吸水。这种吸水会导致聚酰胺的机械性能发生变化，同时体积增大（膨胀）。在本研究中，针对不同的部件几何形状，对聚酰胺6在不同调节环境中的吸附和膨胀行为进行了实验研究，以便基于测量数据开发一种有限元（FE）方法，通过数值计算吸附和膨胀行为。所开发的方法包括使用Abaqus软件进行的两项分析。模拟参数的浓度依赖性实现以及膨胀诱导应力的计算均已完成。这使得能够对吸附曲线进行建模，直至达到最大饱和度，并模拟特征性的S形膨胀曲线。因此，所开发的方法是预测聚酰胺6部件在水浴调节过程中吸附和膨胀行为的有效方法。所确定的特性为开发基于有限元的模拟环境提供了基础，以便在部件设计过程中考虑吸湿情况。这使得能够计算给定部件中水分诱导的膨胀过程以及由此产生的初始应力。
