The　dynamic　compression　experiments　with　a　strain　rate　ranging　from　1　000　s-1　to　2　300　s-1　were　carried　out　on　rigid　polyurethane　foam(RPUF)　using　a　split　Hopkinson　pressure　bar(SHPB)　with　a　diameter　of　37　mm.　The　experimental　results　show　that　the　RPUF　material　has　obvious　strain　rate　effect.　The　RPUF　material　is　regarded　as　an　ideal　elastoplastic　model　without　strain　rate　effect,　and　the　finite　element　software　ABAQUS　is　used　to　carry　out　the　numerical　simulation　of　the　SHPB　experiment　of　the　RPUF　material.　The　simulation　results　show　that　the　dynamic　yield　stress　of　the　RPUF　material　increases　significantly　with　the　increase　of　the　strain　rate.　Therefore,　the　influence　of　the　transverse　inertia　effect　on　the　experimental　results　cannot　be　ignored.　Then,　the　triaxial　confining　pressure　(1　MPa,　2　MPa,　5　MPa　and　10　MPa)　tests　of　RPUF　material　were　carried　out.　The　experimental　results　show　that　the　yield　stress　of　RPUF　material　is　linear　with　the　hydrostatic　pressure.　Therefore,　the　hydrostatic　effect　of　the　material　itself　needs　to　be　considered　when　studying　the　strain　rate　effect　of　RPUF　material.　In　order　to　obtain　the　actual　strain　rate　effect　of　RPUF　material,　based　on　the　experimental　data　of　SHPB　and　triaxial　confining　pressure,　a　constitutive　model　including　hydrostatic　pressure　effect　and　strain　rate　effect　was　proposed　and　applied　to　the　SHPB　numerical　simulation　of　RPUF　material.　Although　this　method　eliminates　the　effect　of　material　hydrostatic　pressure　on　the　experimental　results,　the　simulation　result　is　still　larger　than　the　experimental　value.　This　is　because　the　influence　of　the　transverse　inertia　effect　on　the　experiment　is　not　eliminated　in　the　numerical　simulation.　The　material　parameters　were　corrected　by　introducing　the　correction　coefficient　of　the　transverse　inertia　effect,　and　the　simulation　results　are　in　good　agreement　with　the　experimental　data,　indicating　that　the　proposed　constitutive　model　and　the　corrected　material　parameters　can　truly　reflect　the　mechanical　properties　of　the　RPUF　material　itself,　thus　obtaining　the　actual　strain　rate　effect　of　RPUF　material.　©　2023　Editorial　Office　of　Chinese　Journal　of　Mechanical　Engineering.　All　rights　reserved.