The Mechanical Properties Of PVA Fiber Reinforced Cement-based Composites And Plate Dynamic Response Analysis Under Explosion Loading

Compared with ordinary cement-based composite materials, the fiber reinforcedcement-based composites (FRCC) is a new type of cement-based materials which has theadvantages of high toughness and high impact resistance. High-performance fiber materialcan effectively optimize the mechanical properties of composite material, and improve themechanical properties of cement-based materials, especially the tensile performance anddeformation performance. The study of the mechanical properties of FRCC structure underexplosion loading is not generally recognized by the international community. The mechanicalproperties research on the reinforcement plate of PVA-FRCC under explosion loading wasinvestigated by ANSYS/LS-DYNA in this paper.Firstly, the research of FRCC and the characteristics of structures under explosion loadingwere summarized. Secondly, in order to reach the numerical simulation data, the optimummix ratio and basic parameters were determined by FRCC tests and tidying the materials ofexisting literatures. Third, the numerical simulation method of the reinforcement plate ofPVA-FRCC under explosion loading was determined and explosion load was calculatedthrough simplification load. Finally, based on the numerical simulation result, the verticaldisplacement, velocity curve and equivalent stress of the reinforcement plate of PVA-FRCCwere analyzed, and a lot of factors affecting the dynamic response of the reinforcement plateof PVA-FRCC were considered, such as thickness and constraints of plate and peak value,time and the scale distance of blast loading.Using orthogonal experiment designing method, the factors which affected the mechanicalproperties of PVA-FRCC were analyzed in this paper. The main works and conclusions werefollows:(1) the equation which was between the density of PVA-FRCC and the fiber volumewasρ=2.1e0.1344x.(2)During the block compression test, conical failures did not appear, onlythere is damage on the surface crack, block at the peak load can still maintain good integrity(3) the value of fc/fcu is between0.93and0.98.(4)The formula which was rupture strength ofFRCC and the fiber volume wasf=2.84x311.91x2+13.94x+5.363.(5) Fiber reinforcedcement matrix composites of compression ratio is0.19~0.26.(5) Compared with ordinaryconcrete, the elastic modulus FRCC is lower; its prism specimens mainly oblique shear failureis produced.The dynamic response of the reinforcement plate of PVA-FRCC under exploring loadingwas focused in this paper. Lots of factors which were affecting the dynamic response of thereinforcement plate of PVA-FRCC.(1)The influence of various factors were showed as follows, the effective measure that reduce the vertical displacement of the reinforcement plateof PVA-FRCC under exploring loading was to increase the thickness.(2)Mid-span deflectionof the plate decrease about60%, when the plate thickness changed between100mm and200mm.(3) the influencing factor which affected the dynamic response of the reinforcementplate of PVA-FRCC was not only the peak value of blast loading, but also the time of blastloading.(4)The greater of the scale distance of blast loading, the smaller of Z directiondisplacement. With the decreasing of the scale distance of blast loading, the response ofexplosion loading showed a trend of decrease. Under the same explosive, the displacementpeak and location of the plate were changed, when boundary condition of the plate wastransformed. The position of the displacement peak of the plate moved in the direction of theconstraint weakening.