CHINESE JOURNAL OF ENERGETIC MATERIALS
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浇注PBX替代材料的准静态压缩力学行为及本构模型标定
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1.北京化工大学机电工程学院, 北京 100029;2.西安近代化学研究所, 陕西 西安 710065

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Quasi-static Compression Mechanical Behavior and Constitutive Model Calibration of Casting PBX Substitute Materials
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1.College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2.Xi''an Modern Chemistry Research Institute, Xi''an 710065, China

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    摘要:

    为研究高聚物粘结炸药(PBX)的准静态压缩行为,对两种典型配方(含铝粉与否)的浇注PBX替代材料在不同应变率下进行单轴准静态压缩试验,并对其力学性能进行了对比分析。同时基于朱-王-唐(ZWT)模型提出一种新模型来描述材料的准静态压缩行为,通过遗传算法获取本构模型参数,并使用Fortran语言在Abaqus有限元软件的用户材料子程序(UMAT)接口中进行本构模型的建立。结果表明:浇注PBX替代材料的准静态压缩过程可分为弹性压缩、应力衰减以及失稳破坏3个阶段;准静态压缩力学行为与应变率有明显的相关性,随着应变率的提高,材料的有效压缩应变基本不变,而压缩模量、屈服强度和压缩强度的对数与应变率对数近似呈现出线性关系;铝粉的加入使浇注PBX替代材料压缩模量、屈服强度和压缩强度均有所提升。新构建的本构模型能较好描述浇注PBX替代材料的准静态压缩行为,使用有限元软件对本构模型普适性进行验证,得到仿真计算结果与试验结果间可决系数R2均大于0.98,吻合程度较高。

    Abstract:

    In order to study the quasi-static compression behavior of polymer bonded explosive (PBX), the uniaxial quasi-static compression tests were carried out on two typical PBX substitute materials (with and without aluminum powder) at different strain rates, and their mechanical properties were compared and analyzed. Based on the Zu-Wang-Tang (ZWT) model, a new model was proposed to describe the quasi-static compression behavior of materials. The constitutive model parameters were obtained by genetic algorithm, and the model was developed by using Fortran language in the User Material (UMAT) subroutine interface of Abaqus finite element analysis software. Results show that the quasi-static compression process of casting PBX substitute materials can be divided into three stages: elastic compression, stress decay and instability failure. The mechanical behavior of quasi-static compression is obviously correlated with the strain rate. With the increase of the strain rate, the effective compressive strain of the material is basically unchanged, while the logarithms of compression modulus, yield strength and compressive strength are linearly related to the logarithm of strain rate. The addition of aluminum powder can improve the compression modulus, yield strength and compression strength of casting PBX substitute materials. The newly constructed constitutive model can better describe the quasi-static compression behavior of casted PBX substitute materials, and its universality is validated by the finite element analysis software. The coefficients of determination (R2) between the simulated and experimental results are higher than 0.98, indicating a high level of consistency.

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引用本文

李思涵,王克俭,牛余雷,等.浇注PBX替代材料的准静态压缩力学行为及本构模型标定[J].含能材料, 2024, 32(4):397-407. DOI:10.11943/CJEM2023209.
LI Si-han, WANG Ke-jian, NIU Yu-lei, et al. Quasi-static Compression Mechanical Behavior and Constitutive Model Calibration of Casting PBX Substitute Materials[J]. Chinese Journal of Energetic Materials, 2024, 32(4):397-407. DOI:10.11943/CJEM2023209.

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历史
  • 收稿日期: 2023-09-27
  • 最后修改日期: 2024-01-13
  • 录用日期: 2024-01-04
  • 在线发布日期: 2024-01-11
  • 出版日期: 2024-04-25