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Deformation behavior and simulation of 700 MPa steel subjected to TNT buried explosion load |
GU Chen1, ZHENG Lei2, GE Chen1, ZHAO Hong-shan1, GUO Long-xin2, DONG Han1 |
1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China; 2. Hebei Puyang Steel Co., Ltd., Handan 056305, Hebei, China |
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Abstract A new type of 700 MPa explosion-proof steel(BR700) developed by ourselves was taken as the research object,and the blast resistence process of BR700 steel was studied by simulation and orthogonal experimental design. According to the measured quasi-static and dynamic tensile properties,the Johnson-Cook constitutive equation of BR700 explosion-proof steel was fitted. The deformation behavior of 20 mm thick steel plate under 8 kg TNT buried blast load was studied by detonation test. A simulation model was established,and LS-DYNA simulation software was used to analyze the deformation,stress-strain distribution and overpressure. Under the condition of ensuring the accuracy of simulation model,combined with finite element analysis and orthogonal experimental design. Based on the evaluation indexes of deformation D of steel plate,the rule of the parameters affecting on the blast resistence were calculated by using range analysis, such as material yield strength A,strain hardening constant B,strain hardening index n,strain rate constant C and failure strain FS. The results show that the simulation results of deformation of BR700 steel under 8 kg TNT buried blast load can accurately reflect the deformation behavior of BR700 steel without considering the offset of the tool. The error between the simulated results and the actual steel plate deformation is only 7.7%. According to the overpressure analysis of the simulation results,the steel plate has a good energy absorption effect because of its good plastic toughness,which effectively weakens the damage of the explosion shock wave. According to the orthogonal experimental simulation results,the yield strength A of the material has the highest influence on the deformation D of the steel plate after explosion,followed by the strain hardening index n. The increase of material strength can greatly reduce the amount of explosion deformation and effectively reduce the damage of the explosion impact on the vehicle and occupants. At the same time,the effect of strength on anti-detonation deformation was verified by 1 100 MPa steel plate explosion experiment.
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Received: 21 February 2022
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