Abstract
This paper presents experimental results for fracture behavior of injection-molded glass fiber/polyamide 66 composites. A weighed amount of glass fibers was mixed with polyamide 66 using a twin extruder and the amount of glass fibers was varied from 17 to 41 vol%. Three point bending tests were carried out on single-edge notched bend (SENB) specimens. Specimens were prepared by cutting injection-molded plates in three different directions: parallel to the flow direction (0-SENB specimens), normal to the flow direction (90-SENB specimens), and 45° to the flow direction (45-SENB specimens). The effects of the specimen orientation and fiber volume fraction on the fracture behavior were investigated. In addition, the microstructure of the fracture surfaces of the composites was examined by a scanning electron microscope (SEM). The strain energy at the maximum load for the SENB specimens remained nearly constant at the fiber volume fraction was increased.
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