Optimization of transversal flow stress and strain and weld seam microstructure analysis in butt-HDPE friction stir welded platesKhaled Hamrouni, Mohamed-Ali Rezgui, Ali Trabelsi, Zoltan Kiss and Rachid NasriMechanics & Industry, 21 5 (2020) 501DOI: https://doi.org/10.1051/meca/2020047