高压撞击下E36船用钢的动态响应研究

针对船用钢材料在超高应变率下的动态响应机制及变形强化机理尚不明确的技术基础问题，通过一维平板撞击试验测得了10，20及30 GPa撞击压力下E36船用钢的自由表面速率?时间曲线，计算得到了E36船用钢的Hugoniot弹性极限和层裂强度，利用ANSYS软件模拟了不同撞击压力下的温度场；并采用SEM、TEM等技术研究了E36船用钢在高压撞击下的损伤演化规律和变形强化机理. 试验结果表明:不同撞击压力下材料均发生了层裂，毁伤机理为微孔和微裂纹形核、长大和聚合；随着撞击压力的增加，E36船用钢的Hugoniot 弹性极限变化不大，层裂强度逐渐增加，相变强化、位错强化和孪晶强化是E36船用钢在高压、高应变率下的主要强化机制. 

Dynamic Response of E36 Shipbuilding Steel Under High Pressure Impact

To indicate clearly the dynamic response mechanism and deformation strengthening mechanism of shipbuilding steel materials under ultra-high strain rate, the free surface velocity-time curve of E36 shipbuilding steel under impact pressure of 10, 20 and 30 GPa was measured through one-dimensional plate impact test, and the Hugoniot elastic limit and spall strength of E36 shipbuilding steel were calculated. ANSYS software was used to simulate the temperature field under different impact pressure. The damage evolution law and deformation strengthening mechanism of E36 shipbuilding steel under high-pressure impact were studied based on SEM, TEM and other techniques. The results show that the spalling occurs in the materials under the above mentioned impact pressures, and the damage mechanism is the nucleation, growth and aggregation of micropores and microcracks. With the increase of impact pressure, the Hugoniot elastic limit of E36 shipbuilding steel change little while the spalling strength gradually increases. Phase transformation strengthening, dislocation strengthening and twin strengthening are the main strengthening mechanisms of E36 shipbuilding steel under high pressure and high strain rate.