Multi-scale analysis of mechanical properties and damage behavior of polypropylene composite (GF50-PP) plate at room and cryogenic temperatures

In this paper, glass fiber-reinforced polypropylene (GF50-PP) composite composed of long fibers was prepared by the thermo-compression process for very first time. This presents high mechanical strength and is used in infrastructures, which demand resistance against severe conditions. Mechanical multi-scale damage analysis GF50-PP at ambient cryogenic temperatures have been investigated study using a special sampling procedure according to microscopy observation, X-ray microtomography, ultrasonic measurement, pyrolysis. The results demonstrated exceptional behavior temperature −70 °C mainly due employment novel processing method (thermo-compression) composites with fibers, previously traditional injection molding process. Tensile presented no difference failure strain 20 fatigue lifetime different fiber orientations similar 3-points bending tests or samples taken from regions plate, indicating efficinecy method. Moreover, through monotonic loading that decreasing °C, plasticity threshold didn’t change notably. Overall, proposed preparation provided outstanding uniformity excellent properties even as low has not before.