In　this　paper,　the　effect　of　the　strain　rate　(1/600,　40,　80,　120　and　160　s(-1))　on　the　dynamic　tensile　mechanical　properties　of　the　polyethylene　terephthalate　(PET)　fiber　bundle　at　room　temperate　(25　centigrade)　was　studied　using　an　MTS　machine　and　an　Instron　drop-weight　impact　system.　The　experimental　results　showed　that　the　tensile　strength,　failure　strain,　elastic　modulus　and　toughness　of　the　PET　fiber　bundle　specimen　were　sensitive　to　the　strain　rate.　The　dispersion　of　the　dynamic　tensile　strength　at　different　strain　rates　was　statistically　quantified　through　a　two-parameter　Weibull　distribution　model.　To　investigate　the　deformation　and　failure　mechanism　of　the　PET　fiber　bundle　at　different　strain　rates,　finite　element　analysis　was　conducted　based　on　the　Weibull　distribution　model　of　the　dynamic　tensile　strength.　Not　only　do　the　numerical　simulations　give　close　predictions　for　the　stress-strain　curve　of　the　PET　fiber　bundle,　but　they　also　reveal　the　fracture　process　of　the　fiber　bundle　that　cannot　be　captured　in　the　test.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.