A Study on the Mechanical Property and 3D Fiber Distribution in Injection Molded Glass Fiber Reinforced PA66

Abstract

A Study on the Mechanical Property and 3D Fiber Distribution in Injection Molded Glass Fiber Reinforced PA66Polyamide66 (PA66) is being widely used for automobile part and other applications. In many cases, PA66 is reinforced with glass fiber to enhance its mechanical properties. In this study, the mechanical properties and glass fiber distributions in injection molded part have been investigated for glass fiber reinforced PA66. Two shapes of glass fibers, circular and flat, were used for the glass fiber reinforced PA66. X-ray microtomography (micro-CT) was used to observe the glass fiber distributions in the PA66 composites. Micro-CT photos were taken in three directions to observe the three-dimensional glass fiber distributions in the injection molded specimens. Investigation of the mechanical properties in relation to the glass fiber orientation revealed that the orientation of the fibers enhanced the mechanical properties. Glass fibers with smaller diameters resulted in better mechanical properties. Circular glass fiber reinforced PA66 exhibited better mechanical properties than flat glass fiber reinforced PA66. The skin layer showed that the glass fibers strongly orientated to the flow direction while glass fibers in the core layer orientated perpendicular to the flow direction because of fountain flows. Glass fibers in the core layer also oriented to the width direction of the flow. Consequently, glass fibers in this core region oriented three dimensionally. Full three-dimensional model of glass fiber orientation was proposed in this paper.

Effect of supercritical nitrogen content on the weld lines and mechanical properties of microcellular injection molded double gate PP/Al parts

“…In the mold cavity, the melt flows in the form of a fountain stream before two melt meet from different directions. The orientation of the Al flakes at the skin region is parallel to the flow direction, while the Al flakes are perpendicular to the flow direction in the flow front at the weld line region, which is similar to the fiber orientation behavior in the weld line region 35 . Thus, wedges of Al flakes were observed on the weld line surface, which caused a black prominent appearance in the region.…”

Modeling and optimization in turning of PA66-GF30% and PA66 using multi-criteria decision-making (PSI, MABAC, and MAIRCA) methods: a comparative study

“…etc., to substitute several metals and alloys. The addition of 30% glass fiber to PA66 significantly increases the mechanical and thermal properties of polyamide (PA66) [4][5].…”

Physicochemical Studies on the Surface of Polyamide 6.6 Fabrics Functionalized by DBD Plasmas Operated at Atmospheric and Sub-Atmospheric Pressures

“…PA6.6 compounds have excellent physical–chemical, mechanical, and electrical properties. It worth highlighting the melting temperature of 250 °C, the tensile strength of 81 MPa, the low weight, the excellent machinability, the dimensional stability, the dielectric constant of 3.6, and the breakdown voltage of 16 kV/mm [ 1 , 2 ]. These characteristics, associated with lower manufacturing costs, make PA6.6 an important thermoplastic used in molded components used in the automotive industry [ 3 , 4 , 5 ], filtration applications [ 1 , 6 , 7 ], and numerous engineering applications [ 8 ].…”