孙妮, 柳锦春, 王钰颖. 聚脲材料动态压缩力学行为的数值模拟研究[J]. 工程力学, 2023, 40(1): 144-154. DOI: 10.6052/j.issn.1000-4750.2021.08.0596
引用本文: 孙妮, 柳锦春, 王钰颖. 聚脲材料动态压缩力学行为的数值模拟研究[J]. 工程力学, 2023, 40(1): 144-154. DOI: 10.6052/j.issn.1000-4750.2021.08.0596
SUN Ni, LIU Jin-chun, WANG Yu-ying. NUMERICAL SIMULATION RESEARCH ON DYNAMIC COMPRESSION MECHANICAL BEHAVIOR OF POLYUREA[J]. Engineering Mechanics, 2023, 40(1): 144-154. DOI: 10.6052/j.issn.1000-4750.2021.08.0596
Citation: SUN Ni, LIU Jin-chun, WANG Yu-ying. NUMERICAL SIMULATION RESEARCH ON DYNAMIC COMPRESSION MECHANICAL BEHAVIOR OF POLYUREA[J]. Engineering Mechanics, 2023, 40(1): 144-154. DOI: 10.6052/j.issn.1000-4750.2021.08.0596

聚脲材料动态压缩力学行为的数值模拟研究

NUMERICAL SIMULATION RESEARCH ON DYNAMIC COMPRESSION MECHANICAL BEHAVIOR OF POLYUREA

  • 摘要: 以聚脲材料动态压缩力学特性为研究对象,提出了考虑动态弹性模量、动态强度因子和动态切线模量的简化三直线弹塑性本构模型;基于ANSYS/LS-DYNA有限元分析软件,建立了低、中、高不同应变率下聚脲材料压缩有限元模型,并与实验结果进行对比分析。结果表明:动态弹性模量增大因子、动态强度因子和动态切线模量因子随应变率增加而有规律的增大,均和应变率的对数呈双线性关系。在中低应变率下,三者的线性关系斜率都比较平缓;在高应变率下,三者的线性关系斜率都比较陡,且弹性模量动态增大因子的斜率比动态强度因子的更大,而第二阶段动态切线模量因子的斜率与动态强度因子的基本一致,但第三阶段动态切线模量因子的斜率是动态强度因子的2.3倍左右,说明高应变率下聚脲材料的后期应力强化效应更加显著。聚脲材料的简化三直线弹塑性本构模型可以在ANSYS/LS-DYNA有限元软件中较好地实现。该文建立的有限元模型能较为准确地模拟聚脲材料压缩实验,进一步验证了简化弹塑性本构模型在不同应变率压缩加载下的有效性。该研究可以为聚脲涂覆加固防护结构有限元模型提供材料模型参数依据。

     

    Abstract: Taking the dynamic compression mechanical properties of polyurea as the research object, a simplified three-line elastic-plastic constitutive model is proposed, considering dynamic elastic modulus, dynamic intensity factor and dynamic tangent modulus. Based on ANSYS/LS-DYNA software, the compression finite element model of polyurea under different grade strain rates are established and compared with tests. The research results show following characteristics: The dynamic elastic modulus increase factor, dynamic intensity factor and dynamic tangent modulus factor increase regularly with the increase of strain rates, and the relationship is bilinear with the logarithm of strain rates. At low and intermediate strain rates, the slopes of the linear relationships are gentle; at high strain rate, the slopes of the linear relationships are steep, the slope of the dynamic increase factor of elastic modulus is greater than that of the dynamic intensity factor, and the slope of the dynamic tangent modulus factor in the second stage is the same as that of the dynamic intensity factor, but the slope of the dynamic tangent modulus factor in the third stage is about 2.3 times that of the dynamic intensity factor, it shows that the late stress strengthening effect of polyurea under high strain rate is more significant. The simplified three-line elastoplastic constitutive model of polyurea can be better realized in ANSYS/LS-DYNA. The finite element model established can simulate the compression test of polyurea, and further verifies the effectiveness of the simplified elastoplastic constitutive model under compression loading with different strain rates. The analysis might provide the material model parameters basis for the finite element model of polyurea coating reinforced protective structure.

     

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