EFFECT OF GRAPHITE PARTICLES ADDITION AND PROCESS PARAMETERS ON THE MECHANICAL PROPERTIES OF POLYETHYLENE/GRAPHITE SURFACE COMPOSITE FABRICATED BY FRICTION STIR PROCESSING. J. eng. sustain. dev. 2016;20(3):155-167. تاريخ الوصول مايو 17, 2024. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/669