Dynamic Test and Constitutive Model of 225 MPa Low Yield Point Steel Material and its Energy Absorption Ability
Dynamic Test and Constitutive Model of 225 MPa Low Yield Point Steel Material and its Energy Absorption Ability
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DOI：
10.1260/2041-4196.2.4.527
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发表时间：
2011-12
影响因子：
2
通讯作者：
Chunwei Zhang
中科院分区：
文献类型：
--
作者：
Chunwei Zhang
基于低屈服点钢（Low Yield Point，LYP）的屈服强度相对较低、塑性性能优于传统结构钢材料等特点，探讨了利用LYP钢材料通过塑性变形吸收爆炸冲击波能量的可行性。选用中国鞍钢股份有限公司生产的225 MPa级LYP钢，简称AQ 225，分别通过准静态和分离式霍普金森压杆（SHPB）实验进行了测试。然后，通过对原始试验数据的全面深入处理，建立了Johnson-Cook动力本构模型。并对模型的可靠性及相应参数进行了讨论。最后，通过数值模拟研究了LYP钢与其他不同类型的钢材（如高强度HQ 600和普通高强度低合金钢Q345）构成的方板结构在爆炸载荷作用下的动力响应。结果表明，LYP钢通过累积塑性变形吸收爆炸冲击能量的优势，为该材料在防护结构中的应用提供了依据。
Based on Low Yield Point (LYP) steel's attractive features, e.g. relative lower yielding strength, better plasticity performance than traditional structural steel material, the feasibility of utilizing LYP steel material for absorbing blast and impact/shock energy through its plastic deformation is discussed in this paper. Selected 225 MPa class LYP steels made by Chinese An Gang Corp., abbreviated as AQ225, are tested via quasi-static and split Hopkinson pressure bar (SHPB) experiments, respectively. Then, Johnson-Cook dynamic constitutive model is developed through a comprehensive thorough processing of raw test data. Moreover, the reliability of achieved model and its corresponding parameters are discussed. Finally, the dynamic response of a square plate structure made of LYP steel as well as other different types of steel materials, e.g. high-strength HQ600 and normal high-strength low alloy steel Q345, subject to explosive loading is studied through numerical simulations. As a result, the advantages of LYP steel for absorbing blast and impact energy through the accumulated plastic deformation are demonstrated, which provides the basis of utilizing such material for protective structures.