Turk Janez, Svenšek Daniel
Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana, SI-1000 Ljubljana, Slovenia.
HELLA Saturnus Slovenija d.o.o., Letališka cesta 17, SI-1000 Ljubljana, Slovenia.
Polymers (Basel). 2023 Jun 27;15(13):2841. doi: 10.3390/polym15132841.
In the realm of injection-molded parts, small length scale deformation defects such as sink marks often pose a major challenge to the aesthetics or functionality of the parts. To address this problem, we present a comprehensive thermoelastomechanical approach that calculates the deformation of injection molded plastic by solving the elastic problem at each time step. In our methodology, two treatments of the molten core are considered: one as a liquid and the other as a rubbery state. Our results suggest that the rubbery state treatment provides higher accuracy in predicting the deformation results, as it maintains the displacement of the localized thermal shrinkage in its vicinity. The validity of our method is supported by empirical measurements on produced parts from the existing literature as well as on samples that we molded independently.
在注塑成型零件领域，诸如缩痕等小长度尺度的变形缺陷常常对零件的美观性或功能性构成重大挑战。为解决这一问题，我们提出了一种全面的热弹性力学方法，该方法通过在每个时间步求解弹性问题来计算注塑成型塑料的变形。在我们的方法中，考虑了对熔芯的两种处理方式：一种将其视为液体，另一种将其视为橡胶态。我们的结果表明，橡胶态处理在预测变形结果时具有更高的准确性，因为它能保持其附近局部热收缩的位移。我们方法的有效性得到了现有文献中生产零件的实证测量以及我们独立模制的样品的支持。
