Abstract:
In this study, a total of 6 different composites were obtained by adding 10%, 20% and 30% short glass fiber in 6
mm dimensions to each of the polyamide 12 and polyamide 6 matrix elements under the same production method
and same conditions. Unlike the studies in the literature, in this study, a more reliable comparison was made between
composite materials produced under the same production method and under the same conditions. The reinforcement
and matrix materials were mixed using the extrusion method and then formed into plates by the press molding
technique. Tensile and 3-point bending tests of these composites were performed and their mechanical properties
were examined. As a result of the study, it was observed that the mechanical properties of the materials increased
with increasing fiber ratios, but the mechanical effect on the material decreased as the fiber ratio increased. S/N
ratios were calculated for the mechanical properties of the composites and the effect of matrix, fiber and additive
ratios on mechanical properties was determined using analysis of variance (ANOVA). According to the
Signal/Noise (S/N) ratios and ANOVA results, it was observed that the composites had different effects on the
mechanical properties. Looking at the test results, it was seen that the increased fiber ratio improved the mechanical
properties of the materials. Therefore, pipes are designed considering the mechanical properties of composite
materials with 30% glass fiber added to each matrix element. The composite pipe design to be pressure tested was
designed in Solidworks program with a length of 500 mm according to ISO 1167 standards. Pipe dimensions with
an outer diameter of 125mm, which are used as a standard in natural gas infrastructure works, are taken as reference
