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软质聚氨酯泡沫的动态压缩力学性能和本构模型

苏兴亚 周伦 敬霖 邓贵德 赵隆茂

苏兴亚, 周伦, 敬霖, 邓贵德, 赵隆茂. 软质聚氨酯泡沫的动态压缩力学性能和本构模型[J]. 爆炸与冲击, 2022, 42(9): 091410. doi: 10.11883/bzycj-2022-0201
引用本文: 苏兴亚, 周伦, 敬霖, 邓贵德, 赵隆茂. 软质聚氨酯泡沫的动态压缩力学性能和本构模型[J]. 爆炸与冲击, 2022, 42(9): 091410. doi: 10.11883/bzycj-2022-0201
SU Xingya, ZHOU Lun, JING Lin, DENG Guide, ZHAO Longmao. Dynamic compressive mechanical properties and constitutive models of flexible polyurethane foam[J]. Explosion And Shock Waves, 2022, 42(9): 091410. doi: 10.11883/bzycj-2022-0201
Citation: SU Xingya, ZHOU Lun, JING Lin, DENG Guide, ZHAO Longmao. Dynamic compressive mechanical properties and constitutive models of flexible polyurethane foam[J]. Explosion And Shock Waves, 2022, 42(9): 091410. doi: 10.11883/bzycj-2022-0201

软质聚氨酯泡沫的动态压缩力学性能和本构模型

doi: 10.11883/bzycj-2022-0201
基金项目: 国家自然科学基金(12122211);国家重点研发计划(2016YFF0203102);四川省自然科学基金(2022NSFSC0035)
详细信息
    作者简介:

    苏兴亚(1991- ),男,博士研究生,su_swjt@163.com

    通讯作者:

    敬 霖(1984- ),男,博士,研究员,博士生导师,jinglin@swjtu.edu.cn

  • 中图分类号: O347.3

Dynamic compressive mechanical properties and constitutive models of flexible polyurethane foam

  • 摘要: 采用Instron 9350落锤试验机研究了中低应变率下软质聚氨酯泡沫的动态压缩力学性能,分析了其应力-应变响应特征和应变率敏感性,讨论了应变率对材料应变率敏感性指数和能量吸收特性的影响,并基于实验结果建立了可准确描述其压缩力学响应的率相关本构模型。结果表明,软质聚氨酯泡沫的静动态压缩应力-应变响应具有典型的三阶段特征,且呈现出明显的应变率强化效应。准静态加载下,材料具有较高的吸能效率但能量吸收值较小,应变率对最大吸能效率和比吸能的影响较小;动态加载下,随着应变率的增加,最大吸能效率显著减小而比吸能明显增大。考虑应变率影响的修正Sherwood-Frost模型和修正Avalle模型都能够很好地表征软质聚氨酯泡沫的静动态压缩应力-应变响应,但修正Avalle模型的参数较少,更便于工程应用。研究结果可为软质聚氨酯泡沫抗冲击结构的设计和优化提供指导。
  • 图  1  FPUF试件尺寸和SEM图像

    Figure  1.  The specimen size of FPUF and its SEM image

    图  2  准静态和动态压缩实验装置

    Figure  2.  Equipment for quasi-static and dynamic compression experiments

    图  3  在不同应变率下FPUF的压缩应力-应变关系

    Figure  3.  Compressive stress-strain curves of FPUF at different strain rates

    图  4  0.001 s−1应变率下FPUF的压缩应力和吸能效率随应变的变化

    Figure  4.  Variation of compressive stress and energy absorption efficiency of FPUF with strain at the strain rate of 0.001 s−1

    图  5  不同应变率下FPUF的密实化应变

    Figure  5.  Densification strain of FPUF at different strain rates

    图  6  不同应变率下FPUF的平台应力和屈服应力

    Figure  6.  Plateau stress and yield stress of FPUF at different strain rates

    图  7  不同泡沫材料的平台应力与应变率之间的关系

    Figure  7.  Relationships between plateau stress and strain rate for different foams

    图  8  动态压缩下FPUF的应变率敏感性指数与应变之间的关系

    Figure  8.  Relationship between strain rate sensitivity index of FPUF and strain under dynamic compression

    图  9  不同应变率下单位体积FPUF吸收的能量随应变的变化

    Figure  9.  Variation of energy absorbed per unit volume of FPUF with strain at different strain rates

    图  10  单位体积FPUF在密实化应变时吸收的能量随压缩应变率的变化

    Figure  10.  Variation of energy absorbed per unit volume of FPUF at densification strain with compressive strain rates

    图  11  不同应变率下FPUF的最大吸能效率和最大理想吸能效率

    Figure  11.  The maximum energy absorption efficiencies and the maximum ideal energy absorption efficiencies of FPUF at different strain rates

    图  12  不同泡沫材料的比吸能与应变率的关系

    Figure  12.  Relationship between specific energy absorption of different foams and strain rate

    图  13  S-F模型的预测结果和实验结果的对比

    Figure  13.  Comparison of the prediction by the S-F model with the experimental result

    图  14  修正后的S-F模型的预测结果和实验结果的对比

    Figure  14.  Comparison of the predictions by the modified S-F models with the experimental results

    图  15  Avalle模型的预测结果与实验结果的对比

    Figure  15.  Comparison of the prediction by the Avalle model with the experimental result

    图  16  修正后的Avalle模型的预测结果与实验结果的对比

    Figure  16.  Comparison of the predictions by the modified Avalle model with the experimental results

    表  1  形状函数$f(\varepsilon) $的参数

    Table  1.   Fitting parameters of the shape function $f(\varepsilon) $

    A1A2A3A4A5A6A7A8
    −0.0144.75−59.04332.27−997.661653.19−1426.30501.74
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-05-11
  • 修回日期:  2022-07-20
  • 网络出版日期:  2022-07-23
  • 刊出日期:  2022-09-29

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