Effect of thermal aging on mechanical and tribological behaviors of short glass fiber–reinforced PA66

Abstract

The use of polyamide (PA) composites in a variety of thermal conditions can enormously affect their durability that is a very important issue for designers and users. In this study, mechanical and tribological behaviors of PA66 reinforced by various weight fractions of short glass fiber were investigated. All studied materials were subjected to accelerated thermal aging tests. Three-point bending flexural tests were carried out to determine the mechanical behavior. Reciprocating tribotester was employed to determine friction and wear behaviors. Tribological tests were carried out without lubrication and under ambient conditions. Ball on flat contact configuration was adopted for friction tests. Wear tests were carried out against an abrasive counterface. Results showed that flexural strength and elastic modulus increased when increasing glass fiber rate for all tested materials. In the contrary, coefficient of friction and wear resistance decreased. Results showed that the thermal aging increased the flexural features and reduced the coefficient of friction. The effect of thermal aging on the wear resistance depends on the reinforcement rate.

Tribological properties of carbon fiber and multi-walled carbon nanotube filled polyamide 66 composites

“…In the second stage, called as steady-state, the friction coefficient of the PA 66 and PA 66 composites reached a steady value after about 600m sliding distance. Similar results were obtained by Horovistiz [3], Autay [9], Zhou [8], Li [27] and Mertens [28]. Mertens [28] stated that the coefficient of friction has become stable after 500 s. It is stated that this behavior is due to the non-uniform contact between the pin and the counter disc surface.…”

“…However, PA66 engineering polymer material also has some disadvantages such as high moisture absorptivity, poor dimensional stability, low heat deflection temperature, poor low-temperature impact strength, and easy flammability [5][6][7][8]. Glass fibers (GF) [3,9,10], carbon fibers (CF) [1,11] and aramid fibers (AF) [12][13] have been successfully used to improve the strength to high pressure, high load carrying capacities and stiffness of PA66. Among them, glass fibers have been used to reinforce PA66 because of its good thermal conductivity, mechanical properties, wear resistance, and low manufacturing cost [10].…”

Thermal aging effect of polyamide 6 matrix composites produced by Tailor Fiber Placement (TFP) under compression molding on sliding wear properties

“…The effect of hygrothermal aging on wear resistance varied with the reinforcement rate. In another study by Autay et al, 21 the effect of thermal aging on the mechanical and tribological properties of short glass‐fiber‐reinforced PA66 was studied. All the materials were subjected to accelerated thermal aging tests, and the results showed that decreasing the moisture rate improved the mechanical properties and reduced the stationary coefficient of friction for both reinforced and unreinforced samples.…”