The aim of the present work is to analyze the morphology, mechanical properties and fracture behaviour of solid and foamed plates made of glass fiber-reinforced PP. The morphology exhibited a solid skin/foamed core structure, dependent on the foaming ratio. Simulation of the microcellular injection molding process with Moldex 3D® software provided a good approach to the experimental results. The flexural properties and impact resistance showed lower values as the apparent density decreased, but constant specific properties. The fracture characterization was carried out by determining the Crack Tip Opening Displacement (CTOD) at low strain rate, as well as the fracture toughness (K_Ic) at impact loading. Foamed specimens presented higher values of CTOD than the solid ones and higher as the foaming ratio increases, due to cells acting as crack arrestors by blunting the crack tip. However, the fracture toughness K_Ic decreased with decreasing the apparent density. Anisotropy due to fiber orientation was also observed. Fibers were aligned in the filling direction in the surface layers, while they were oriented in the transverse direction in the core. According to the amount of fibers oriented in one direction or another, different properties were obtained.

本工作的目的是分析玻璃纤维增​​强PP制成的固体和泡沫板的形貌，力学性能和断裂行为。形态表现出坚实的表皮/泡沫芯结构，这取决于发泡率。使用Moldex 3D®软件对微孔注射成型过程进行仿真，为实验结果提供了一种很好的方法。当表观密度降低时，弯曲性能和抗冲击性显示出较低的值，但是恒定的特定性能。通过确定低应变率下的裂纹尖端开口位移（CTOD）以及断裂韧性（K _Ic）。泡沫试样的CTOD值比固体试样高，并且随着发泡率的增加，CTOD值也更高，这是由于气泡通过钝化裂纹尖端而起到了避雷器的作用。但是，断裂韧性K _Ic随着表观密度的降低而降低。还观察到由于纤维取向引起的各向异性。纤维在表层中沿填充方向排列，而纤维在芯中沿横向方向排列。根据沿一个方向或另一个方向取向的纤维的量，获得了不同的性能。