![]() The plies oriented at ± 45° balanced the stress and contributed to higher levels of deformation during the test due to fiber rotation toward the loading direction, also, no post-yield stiffening was found as in thermoset composites due to the ductile nature of the thermoplastic matrix these layers limited the crack propagation in the transverse direction, canceling the in-plane shear stress. The laminates with 0° layers showed a fragile and sudden fracture oriented at 90° to the aplied load, even with low fiber content. The fibers at 0° conferred high stiffness to the composite, limiting the maximum deformation and promoting failure. The mechanical performance of the laminates was influenced by the fiber orientation at the different layers. The specimens were laminated by compression molding, tensile tested, and their fracture area was analyzed by microscopy. The prepregs were prepared in a continuous impregnation system using the dry powder method in a fluidized bed. Thermoplastic multilayer composites with different fiber orientations were prepared with polypropylene and aramid fibers as reinforcing material. Centro de Investigación Científica de Yucatán, Mérida, Mexico. ![]()
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