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. [انترنت]. 1 مايو، 2016 [وثق 17 مايو، 2024];20(3):155-67. موجود في: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/669