3D-printed composites have promising potential for applications as structural or functional parts in different engineering fields. However, due to the presence of pores and weak interface interactions, 3D-printed parts have weaker mechanical performance than traditional processed ones. In recent years, polypropylene (PP) emerged as a new 3D printing material with enormous potential. In this work, two PP-based composites (PP/EPR(ethylene-propylene-rubber) and PP/EPDM(ethylene-propylene-diene-monomer)/talc) were chosen to study the effects of extrusion temperature and layer thickness on the quasi-static and dynamic behavior of 3D-printed PP-based composites. The results obtained in this study indicated that the processing induced voids have a significant impact on the mechanical properties of printed specimens as they could cause stress concentration and trigger crack propagation. A smaller layer thickness and a moderate printing temperature could reduce pore size and porosity in the printed parts and consequently increase their mechanical properties. Compared to the response under quasi-static loading, the apparent strength and modulus for both materials under dynamic compression were much higher. Under impact loading, polypropylene-based composites exhibited different rupture characteristics caused by the different reinforcement.

3D 打印复合材料在不同工程领域作为结构或功能部件具有广阔的应用潜力。然而，由于孔隙的存在和较弱的界面相互作用，3D打印部件的机械性能比传统加工部件弱。近年来，聚丙烯（PP）作为一种具有巨大潜力的新型 3D 打印材料应运而生。在这项工作中，选择了两种 PP 基复合材料（PP/EPR（乙烯-丙烯-橡胶）和 PP/EPDM（乙烯-丙烯-二烯-单体）/滑石）来研究挤出温度和层厚对3D 打印 PP 基复合材料的准静态和动态行为。本研究中获得的结果表明，加工引起的空隙对打印试样的机械性能有显着影响，因为它们会导致应力集中并引发裂纹扩展。较小的层厚和适中的打印温度可以减少打印部件的孔径和孔隙率，从而提高其机械性能。与准静态载荷下的响应相比，两种材料在动态压缩下的表观强度和模量要高得多。在冲击载荷下，聚丙烯基复合材料表现出由不同增强材料引起的不同断裂特性。较小的层厚和适中的打印温度可以减少打印部件的孔径和孔隙率，从而提高其机械性能。与准静态载荷下的响应相比，两种材料在动态压缩下的表观强度和模量要高得多。在冲击载荷下，聚丙烯基复合材料表现出由不同增强材料引起的不同断裂特性。较小的层厚和适中的打印温度可以减少打印部件的孔径和孔隙率，从而提高其机械性能。与准静态载荷下的响应相比，两种材料在动态压缩下的表观强度和模量要高得多。在冲击载荷下，聚丙烯基复合材料表现出由不同增强材料引起的不同断裂特性。