西北核技术研究所, 陕西 西安 710024
* 邮箱: qianbingwen@nint.ac.cn
收稿:2025-10-02,
网络首发:2026-02-03,
纸质出版:2025
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柏准, 钱秉文, 胡玉涛, 等. 冲击荷载作用下EPS混凝土的动态行为和本构模型[J]. 兵工学报, 2025,46(S2):250901.
Zhun BAI, Bingwen QIAN, Yutao HU, et al. Dynamic Behavior and Constitutive Model of EPS Concrete under Impact Loading[J]. Acta Armamentarii, 2025, 46(S2): 250901.
柏准, 钱秉文, 胡玉涛, 等. 冲击荷载作用下EPS混凝土的动态行为和本构模型[J]. 兵工学报, 2025,46(S2):250901. DOI: 10.12382/bgxb.2025.0901.
Zhun BAI, Bingwen QIAN, Yutao HU, et al. Dynamic Behavior and Constitutive Model of EPS Concrete under Impact Loading[J]. Acta Armamentarii, 2025, 46(S2): 250901. DOI: 10.12382/bgxb.2025.0901.
冲击荷载作用下发泡聚苯乙烯(Expanded Polystyrene
EPS)混凝土的动态力学行为对于地下结构抗爆设计和毁伤评估具有重要意义。利用分离式霍普金森压杆试验装置对EPS混凝土开展了不同应变率、不同体积掺量的动态压缩试验
并运用代表性体积单元概念
将EPS混凝土假设为由无损基体、微裂纹、EPS颗粒构成的复合材料
并基于细观损伤力学建立了材料的本构模型。试验结果表明:EPS混凝土的极限应变和动态抗压强度表现出明显的应变率敏感性;EPS体积掺量每增加10%
材料动态抗压强度平均降低10~15MPa左右
呈现出规律性比较明显的梯度下降
且应变率变化并不能改变混凝土的抗压强度与EPS体积掺量的负相关关系。本构模型重构结果表明:PCW方法能够客观反映微裂纹演化过程中的相互作用和空间分布
可以较好地刻画EPS混凝土的应变率效应和EPS颗粒体积掺量的相关性
为EPS混凝土的动态力学行为预测提供了有力手段。
The dynamic mechanical behavior of expanded polystyrene (EPS) concrete under impact loading is of great significance for the anti-explosion design and damage assessment of underground structures.The dynamic compression tests of EPS concretes with different volume contents under different strain rates are conducted using split Hopkinson pressure bar (SHPB) test device.Based on the concept of representative volume element
EPS concrete is assumed to be a composite material composed of a non-destructive matrix
micro-cracks
and EPS particles.A constitutive model of the material is established based on micro-scale damage mechanics.The test results show that the ultimate strain and dynamic compressive strength of EPS concrete exhibit significant strain rate sensitivity.For every 10% increase in EPS volume content
the dynamic compressive strength of the material is decreased by approximately 10-15MPa
presenting a gradient decline with a relatively obvious regularity.The change in strain rate does not alter the negative correlation between the compressive strength of concrete and the volume content of EPS.The reconstruction results of the constitutive model indicate that the PCW method can objectively reflect the interaction and spatial distribution of micro-cracks during evolution
and can well depict the strain rate effect of EPS concrete and the correlation of the volume content of EPS particles.The proposed model provides an effective means for predicting the dynamic mechanical behavior of EPS concrete.
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