Numerical Simulation Of Ultra High Toughness Cementitious Composites Target Subjected To Penetration And Explosion

As a special composite material,concrete has been widely used in civilian facilities due to its good formability,water resistance and economical properties.The research on explosion resistance and penetration resistance of concrete structures has always been a hot research field for a long time.However,it is prone to brittle failure when subjected to impact loading,and the fragments pose a great threat to personal safety.UHTCC(Ultra High Toughness Cemeniitious Composite)is a new type of tension strain-hardening fiber reinforced concrete material with an ultimate tensile strain of more than 3%and high toughness.Therefore,it has broad application prospects in the field of explosion resistance and penetration resistance.In this paper,the impact resistance performance of UHTCC is studied by using the numerical simulation technology which developed rapidly in the recent 30 years.The details of content as following:1)A complete investigation of various numerical simulation algorithm was carried out,and a numerical simulation algorithm for impact resistance simulation of UHTCC was determined.2)A complete investigation of various concrete model was carried out and found that the K&C model is suitable for simulation,then some tests on UHTCC was carried out to determine the value of parameters in the K&C model.3)Experiments and simulation results show that PVA fiber has little effect on improving the penetration resistance of target,while coarse aggregate can improve the penetration resistance.Numerical simulation of penetration experiments was conducted on 4 different strengths of target(20MPa,50MPa,80MPa and 100MPa)and found that the penetration depth of UHTCC targets was comparable to that of concrete,while the diameter of crater decreased by at least 50%.Besides,blast tests were conducted and found UHTCC has superior explosion resistance performance,the depth of crater of UHTCC decreased by 80%compared to that of concrete.Finally,a brief summary of the research work done in this paper was made,and the next step of further research was discussed.