基于Johnson-Cook本构模型的1060铝动态力学性能参数识别及验证
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西安近代化学研究所

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O347.3

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国家自然科学青年基金(12102337)


Identification and Verification of Dynamic Mechanical Properties of 1060 Aluminum based on Johnson-Cook Constitutive Model
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Xi’an Modern Chemistry Research Institute

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    摘要:

    为了建立1060铝材料动态本构模型,利用万能材料试验机和霍普金森拉杆装置,对1060铝试件在室温~300℃范围内的准静态力学性能和0.01~4922s-1拉伸应变率范围内的动态拉伸力学性能进行试验,基于试验结果和J-C本构模型,拟合得到了材料的J-C本构模型,并结合1060铝薄板结构的冲击变形试验和数值仿真对J-C本构模型的准确性进行验证。结果表明:在拉伸载荷作用下,当应变率从准静态向高应变率转变时,1060铝表现出明显的应变硬化特征和应变率敏感性,真实应力随应变率的升高而增大,而材料在高应变率区则表现出较低的应变率敏感性;材料表现出显著的温度热软化效应,其塑性屈服强度随着温度升高而显著降低;利用建立的J-C本构模型对薄板结构的冲击变形进行仿真,仿真与试验结果偏差为2.01%~8.86%。可见,本文建立的J-C本构模型可以表征1060铝材料的动态力学行为。

    Abstract:

    In order to establish the dynamic constitutive model of 1060 aluminum material, the quasi-static tensile mechanical properties of 1060 aluminum in a temperature range from room temperature to 300℃ were investigated by using a universal material testing machine, and the dynamic tensile mechanical properties of 1060 aluminum in a strain rate range from 0.01s-1 to 4922s-1 were also investigated by using a Hopkinson pull rod device. Based on the Johnson-Cook constitutive model and test results, the dynamic mechanical properties of the 1060 aluminum were fitted to obtain the material’s constitutive parameters. In order to verify the accuracy of the constitutive model, the impact deformation test and impact deformation simulation analysis of 1060 aluminum thin plate structure were carried out respectively. The results show that the 1060 aluminum exhibits obvious strain hardening characteristics and strain rate strengthening effects when the strain rate changes from quasi-static to high strain rate, the true stress are increases with the increase of strain rate under the same ture strain, and the material exhibits low strain rate sensitivity in the range of high strain rate. In addition, the 1060 aluminum exhibit significant thermal softening effect, the yield strength of the material decreases with the increase of temperature. Besides, the identified Johnson-Cook constitutive model can be used to simulate the deformation of 1060 aluminum sheet structure under impact load, the relative error is only 2.01%~8.86%, the results indicate that the established models can predict the tensile mechanical response of the 1060 aluminum under a complex stress state.

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毛伯永,刘强,叶希洋,等. 基于Johnson-Cook本构模型的1060铝动态力学性能参数识别及验证[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-10-03
  • 最后修改日期:2024-05-13
  • 录用日期:2024-05-21
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