Dobrotă Dan, Lazăr Sergiu Viorel
Faculty of Engineering, Lucian Blaga University of Sibiu, 550024 Sibiu, Romania.
S.C. Contintental Romania, 550018 Sibiu, Romania.
Polymers (Basel). 2021 Jul 31;13(15):2536. doi: 10.3390/polym13152536.
Parts produced from PBT-GF30 (70% polybutylene terephthalate +30% fiberglass) are very often used in car construction, due to the properties of this material. The current trend is to make parts with a shape designed to be as complex as possible, to take over many functions in operation. During the research, a part that is a component of the structure of car safety systems, and that must be completely reliable in operation, was analyzed. This piece has a complex shape that involves the intersection of several walls. Thus, the research aimed at establishing the optimal radius of connection between the walls (R), the ratio between the thickness of the intersecting walls (K) and the angle of inclination of the walls (α). The composite central design method was used to design the experiments. Both new parts and parts subject to an artificial aging process were tested. All parts were subjected to shear stress, to determine the load (L) and displacement (D) at which they break. In order to observe other changes in the properties of the parts, in addition to the mechanical ones, an analysis of the color of the new and aged parts was performed, as well as a topography of the surface layer in the breaking area. The design of the parts involved changes to the parameters of the injection process. In these conditions, a PBT-GF30 viscosity analysis was performed for new and artificially aged parts.
由PBT-GF30（70%聚对苯二甲酸丁二醇酯+30%玻璃纤维）制成的部件由于这种材料的特性，在汽车制造中经常被使用。当前的趋势是制造形状设计得尽可能复杂的部件，以在运行中承担多种功能。在研究过程中，对一个作为汽车安全系统结构部件且在运行中必须完全可靠的部件进行了分析。这个部件具有复杂的形状，涉及几个壁面的相交。因此，该研究旨在确定壁面之间连接的最佳半径（R）、相交壁面的厚度比（K）以及壁面的倾斜角度（α）。采用复合中心设计方法来设计实验。对新部件和经过人工老化处理的部件都进行了测试。所有部件都承受剪切应力，以确定它们断裂时的载荷（L）和位移（D）。为了观察部件性能的其他变化，除了力学性能外，还对新部件和老化部件的颜色进行了分析，并对断裂区域的表面层进行了形貌分析。部件的设计涉及注塑工艺参数的变化。在这些条件下，对新部件和人工老化部件进行了PBT-GF30粘度分析。
