Zadravec Marko, Kramberger Janez, Nečemer Branko, Glodež Srečko
Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia.
Polymers (Basel). 2024 Dec 27;17(1):42. doi: 10.3390/polym17010042.
A comprehensive experimental investigation to understand the mechanical properties and fatigue behaviour of glass-reinforced polyamide (PA66 GF30) at different temperatures is presented in this paper. The specimens for quasi-static and fatigue testing were machined from previously extruded plates, where two orientations were considered: (i) the extrusion direction (ED) and (ii) the direction perpendicular to extrusion (PED). Both the quasi-static and fatigue tests were performed under different temperatures (22 °C and 100 °C). The fatigue tests were performed in a load control regime under pulsating loading ( = 0.1) to create S-N curves for all the temperatures and loading directions. The experimental results of the quasi-static tests showed that the test specimens manufactured in the extrusion direction have better mechanical properties when compared to those of the specimens manufactured perpendicular to the extrusion direction. Furthermore, the analysis of the quasi-static tensile test results showed that tensile strength, yield strength, and the modulus of elasticity are significantly dependent on the temperature and deteriorate when the temperature is increased from 22 °C to 100 °C. The results of the fatigue tests showed that at both the temperatures (22 °C and 100 °C), the samples produced in the direction of extrusion exhibited higher fatigue strength than those produced perpendicular to the direction of extrusion. For all the sample orientations, the fatigue strength decreased significantly with increasing temperature. The obtained experimental results could be very useful when designing and dimensioning different dynamically loaded engineering components made of PA66 GF30 subjected to high temperatures.
本文介绍了一项全面的实验研究，旨在了解玻璃纤维增强聚酰胺（PA66 GF30）在不同温度下的力学性能和疲劳行为。用于准静态和疲劳测试的试样是从先前挤出的板材上加工而成的，其中考虑了两个方向：（i）挤出方向（ED）和（ii）垂直于挤出方向（PED）。准静态和疲劳测试均在不同温度（22°C和100°C）下进行。疲劳测试在脉动载荷（R = 0.1）下的载荷控制模式下进行，以绘制所有温度和加载方向的S-N曲线。准静态测试的实验结果表明，与垂直于挤出方向制造的试样相比，沿挤出方向制造的测试试样具有更好的力学性能。此外，对准静态拉伸测试结果的分析表明，拉伸强度、屈服强度和弹性模量显著依赖于温度，并且当温度从22°C升高到100°C时会恶化。疲劳测试结果表明，在两个温度（22°C和100°C）下，沿挤出方向生产 的样品比垂直于挤出方向生产的样品表现出更高的疲劳强度。对于所有样品方向，疲劳强度均随温度升高而显著降低。当设计和确定由PA66 GF30制成的承受高温的不同动态加载工程部件的尺寸时，所获得的实验结果可能非常有用。
