基于纳米混杂合成纤维混凝土SHPB试验的RHT数值模型参数研究

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (7) : 181-193.

冲击与爆炸

基于纳米混杂合成纤维混凝土SHPB试验的RHT数值模型参数研究

李长辉1,2，王慧颖1，杨放*1，谢承彦1，崔健3

作者信息 +

Parametric study on RHT numerical model based on SHPB tests of NCSPFRC

LI Changhui1,2, WANG Huiying1, YANG Fang*1, XIE Chengyan1, CUI Jian3

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摘要

本文研究了RHT模型参数对混凝土动态力学响应的影响规律。基于纳米混杂合成聚丙烯纤维混凝土（NCSPFRC）的分离式霍普金森压杆（split Hopkinson pressure bars，SHPB）冲击试验结果和RHT模型原始文献参数，采用Hyper-Mesh和LS-DYNA有限元软件进行数值模拟。研究结果表明：数值模拟结果与试验结果吻合度较低，峰值应力和峰值应变的模拟值相对试验值误差均超过35%，直接使用RHT模型原始文献参数无法准确描述不同强度等级、类型混凝土的动态力学响应。在此基础上，对RHT模型参数的敏感性进行了分析，并根据分析结果对模型参数进行修正，修正后的RHT模型参数所得模拟结果与试验结果具有良好的一致性，相较试验值其模拟峰值应力和峰值应变的误差值大多低于7%，在允许误差范围内。这表明修正后的RHT模型能够较准确地描述NCSPFRC的动态力学性能，同时也验证了本文采用的参数调整方法的正确性和可行性。

Abstract

This paper investigates the effect of RHT model parameters on the dynamic mechanical response of concrete. Based on the split Hopkinson pressure bars（SHPB） tests of Nano Cellulose Synthetic Polypropylene Fiber Reinforced Concrete (NCSPFRC), the impact process was simulated by LS-DYNA and Hyper Mesh with the Riedel-Hiermaier-Thoma (RHT) constitutive model. The results show that the simulation results have a low degree of agreement with the experimental data. The error between the peak stress and peak strain test values and the simulated values is 35%, which exceeds the allowable error. The dynamic mechanical response of different strength classes and types of concrete cannot be accurately described by the original literature parameters of the RHT model. On this basis, the sensitivity of the RHT model parameters was analyzed, and the original model parameters were revised according to the analysis results. The simulation results obtained from the revised RHT model parameters were in good agreement with the test results, the error between the peak stress and peak strain test values and the simulated values is 7% to be within the allowable error. This indicates that the dynamic mechanical properties of NCSPFRC can be accurately described by the revised RHT model parameters. Moreover, the correctness and feasibility of the parameter adjustment method adopted in this study were verified.

导出引用

李长辉1, 2, 王慧颖1, 杨放1, 谢承彦1, 崔健3. 基于纳米混杂合成纤维混凝土SHPB试验的RHT数值模型参数研究[J]. 振动与冲击, 2025, 44(7): 181-193

LI Changhui1, 2, WANG Huiying1, YANG Fang1, XIE Chengyan1, CUI Jian3. Parametric study on RHT numerical model based on SHPB tests of NCSPFRC[J]. Journal of Vibration and Shock, 2025, 44(7): 181-193

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