Reseacrh On Anti-explosion Performance Of Composite Based On Fiber Reinforced Rigid-flex Combination

In recent years,there have been many man-made or non-man-made building explosions at home and abroad,which have brought huge economic losses and casualties to the society.At present,the focus of research at home and abroad in the area of anti-explosion has turned to fiber reinforced composite materials.The composite material is formed by a combination of two or more materials.It has the characteristics of high specific stiffness and high specific strength.It is easy to form and has a designable function.For different fiber reinforced composite materials,new materials obtained through different combinations are studied for their dynamic response under explosive loads to obtain the difference between different materials.It is very meaningful to use the best combination method and apply the obtained optimal structure to protect building.In this paper,ABAQUS is used to study the anti-explosion performance of composite laminates,including shock wave attenuation,deformation resistance and energy absorption characteristics.The main work and results are followed:(1)A VUMAT subroutine is written based on the Hashin,a Cohesive element is inserted between between the lamina to establish a finite element model for explosion analysis.The accuracy of the numerical simulation is verified by comparison with existing test results and theoretical formulas.(2)For the typical rigid-flexible composite structure,through numerical simulation,its anti-explosion performance under different ply angles is studied.It is found that in the selected ply modes,the structure has the strongest shock wave attenuation in the [0/45/-45/90]5 mode,weakest in the [45/0/90/-45]5 mode;the weakest deformation resistance in the [0/45]10 mode,the strongest in the [90/-45/45/0]5 mode;the strongest energy absorption characteristics in the [45/0/90/-45/45]4 mode,the weakest in the [90/-45/45/0]5 mode.(3)Fixing the ply angles,changing two laminas in the structure one by one,to study the anti-explosion performance of the new composite structure.The quantity ratio of the two materials is defined as R.It is found that in this mode,when the ratio R = 0.75,the composite structure has the strongest shock wave attenuation;when R is in the range from 0.45 to 0.55,the improvement of deformation resistance is the most significant;As for the energy absorption characteristics,it will increase significantly with the increase of rigid materials in the early stage,but if the proportion of rigid materials gradually increases,there will be no obvious improvement effect.(4)Based on the previous research results,the optimal ratio of the two laminas under the fixed ply angle was selected to optimize the composite structure,in order to apply the structure to the H-shaped steel column.The accuracy of the numerical simulation is verified by comparison with the existing test results;it is effective for the optimized structure to protect the H-shaped steel column.