Experimental investigation of the mechanical behavior of glass fiber/high fluidity polyamide-based composites for automotive market

Abstract

In this work, we examine the relationships between the microstructure and the mechanical properties of glass fiber–reinforced polyamide 6,6 composite materials ( V f = 54%). These materials made by thermocompression incorporate different grades of high fluidity polyamide-based polymers and two types of quasi-UD glass fiber reinforcement. One is a classic commercial fabric, while the other specially designed and manufactured incorporates weaker tex glass yarns (the spacer) to increase the planar permeability of the preform. The effects of the viscosity of the polymers and their composition on the wettability of the reinforcements were analyzed by scanning electron microscopy observations of the microstructure. The respective influences of the polymers and the spacer on the mechanical performance were determined by uniaxial tensile and compression tests in the directions parallel and transverse to the warp yarns. Not only does the spacer enhance permeability but it also improves physical and mechanical properties: tensile longitudinal Young’s modulus increased from 38.2 GPa to 42.9 GPa (13% growth), tensile strength increased from 618.9 MPa to 697 MPa (3% growth), and decrease in ultimate strain from 1.8% to 1.7% (5% reduction). The correlation of these results with the damage observed post mortem confirms those acquired from analyses of the microstructure of composites and the rheological behaviors of polymers.

Synthesis, properties, and applications of polylactic acid‐based polymers

“…At the same time, the polymeric matrix has the role of associating and ensuring the fibers and transmitting the force to the reinforcing fibers. [ 199–202 ] Natural fibers are becoming an appreciated alternative in reinforced polymer composites, as a result of the energy‐intensive processing needed to produce synthetic fibers. Natural fibers are not only renewable and biodegradable but also possess excellent mechanical characteristics.…”

Recent advances in the use of Polyamide-based materials for the automotive industry

“…According to Meinhard et al [14] , CFRP machining can lead to different types of damage patterns that can be divided into two main types: permanent damages (i.e., delamination, chipping, fiber pullouts) and defects passible of reworking (i.e., irregular shape of holes and burr formation). The majority of machining focused research that studied FG and CF reinforced PAs highlighted the highly abrasive impact of fibers during machining, leading to poor surface finish, rapid progression of tool wear, and damages such as delamination in the machined surface [11,[15][16][17] .…”

Fatigue and durability assessment of PA6-based carbon fiber composites for lightweight applications

“…12 PA6 is used in a variety of industrial applications, including automotive, electrical, and consumer goods. 13,14 This research aims to provide a comprehensive overview of the properties, processing, and applications of PA6, with a particular focus on its use in the automotive industry. PA6 has a unique combination of properties, including high strength, stiffness, toughness, and impact strength.…”

“…20,21 Recent studies have focused on the fatigue behavior and failure mechanisms of CFRP in automotive components, as well as on the development of new manufacturing processes and design methodologies for optimizing their performance. 2,6,12,14,22 These studies have contributed to the advancement of CFRP in the automotive industry, paving the way for the development of sustainable and lightweight vehicles that meet the industry's stringent performance and safety standards. 23 In recent years, there has been an increasing interest in the use of carbon fiber-reinforced PA6 composites in automotive applications.…”