Dynamic Response Analysis Of UHMWPE Board Under The Combined Action Of Explosive Shock Wave And Fragment Penetration

In recent years,due to the turbulent international situation,terrorist attacks and local conflicts have occurred from time to time,which has become an obstacle to the peaceful development of society.In many attacks and conflicts,explosives are one of the main weapons,which constitutes a huge safety for people 's lives and property Threat.Many scholars at home and abroad have achieved certain research results on the shock wave load generated by the protection of explosive explosions,but these studies often ignore the damage of the fragment group accompanying the explosion.As the third-generation high-performance fiber after traditional metal materials,carbon fiber and aramid fiber,UHMWPE fiber has many excellent characteristics such as high strength,high modulus,corrosion resistance,impact resistance,etc.The material is mostly used to resist the penetration of projectiles,UHMWPE fiber combined with the matrix is used to resist the combined effects of explosion shock wave and fragmentation.Relative research on the damage characteristics and protection properties of UHMWPE composite board under the combined effect of explosion shockwave and fragmentation Very important significance.In this paper,the finite element numerical simulation software ANSYS / LS-DYNA is used to calculate and analyze the deformation and failure characteristics and protective performance of the UHMWPE composite target plate under the combined action.The details are as follows:(1)The finite element calculation model of the air domain,explosives,fragment group,target plate and fixture was established.Through the comparison and analysis with the experimental data in the experimental examples,it was determined that the material model and fluid-solid coupling algorithm selected for the model were feasible.(2)Based on the correct numerical model and material parameters,the research on the deformation and breakage characteristics and protection performance of UHMWPE composite plates under the single load of explosion shock wave or fragment group was carried out,and the main factors affecting the deformation and damage of the target plate were determined Through the comparative analysis of the single load effect and the combined load effect,it is known that the fragment group has an impact on the transmission of the shock wave.The shock wave mainly causes the bending deformation of the target plate.The deformation and failure of the plate is far more serious than the superposition of the deformation and failure of the target plate under a single load.(3)Under the joint action of explosive shock wave and fragment group,by changing the equivalent and explosion distance of explosive,the quantity and quality of fragments,etc.,the factors that mainly affect the deformation and failure results of composite plate,the calculation conditions are discussed to discuss and study,and different parameters are obtained Influence of deformation and failure process,failure failure mode and protection ability under joint action.(4)Under the combined load of the explosion shock wave and the fragment group,the target plate's resistance to deformation and damage and the overall protection ability are studied by changing the characteristics of the composite plate itself,namely the plate thickness,and combined with the traditional protective material-steel,by changing the target plate different materials The layer thickness and the combination method are analyzed to study the protection performance of the target plate under different combinations.The simulation results show that: increasing the thickness of the UHMWPE composite material layer can effectively reduce the quality and improve the target plate's ability to resist the penetration of the fragment group,Increasing the thickness of the steel can improve the target's resistance to impact,especially when the surface layer is steel,it can effectively reduce the bending deformation of the ultra-high molecular weight polyethylene composite material,thereby reducing the overall deformation of the target.(5)By bonding to the burst surface of the H-shaped steel column,the protective effect of the UHMWPE composite material on the structure is analyzed.The simulation results show that the UHMWPE composite board is bonded to the H-shaped steel column structure for reinforcement and protection It can effectively reduce the degree of deformation and damage of the steel column when the combined load of the explosion shock wave and the fragment group,compared with the steel column without the reinforcement of the protective material,the bending deformation of the steel column with the reinforcement of the protective material and the penetration range of the fragment group are reduced The maximum displacement peak is reduced by 54.21%;after adding the steel plate,the overall deformation of the steel column is smaller,and the maximum displacement peak is reduced by 68.69%,which shows that the structure reinforced with protective materials is safer.