Mechanical behaviors of metakaolin-based foamed geopolymer (MKFG) under dynamics loading

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering Pub Date : 2024-09-06 DOI:10.1016/j.ijimpeng.2024.105106

Wenxin Wang , Yajun Zhang , Hang Zhou , Yangpiaoxue Shi , Dawei Chen , Jiaxi Mao , Zhen Wang , Shikun Chen , Yi Liu , Dongming Yan

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Abstract

In this study, metakaolin-based foam geopolymer (MKFG) with densities of 400 kg/m³, 600 kg/m³, and 800 kg/m³ were prepared. The effect of weak links on the dynamic mechanical behavior, damage morphology, and energy absorption capacity (SEA_p) of the MKFG was studied by X-CT analysis, Split Hopkinson Pressure Bar (SHPB) test, and fractal analysis. The results show that the connected porosity of MKFG rises with decreasing density. The sensitivity of the damage level to strain rate decreases with elevated connected porosity, which is because the stress concentrations caused by weak links. The amplifying effect of strain rate on the dynamic compressive strength of MKFG diminishes as the connected porosity increases. The sensitivity of SEA_p to the damage level rises with a decrease in the connected porosity. Finally, the simulation results corroborate that the distribution of connected pores has a significant influence on the damage process of the MKFG.

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偏高岭土基发泡土工聚合物（MKFG）在动态加载下的力学行为

本研究制备了密度分别为 400 kg/m3、600 kg/m3 和 800 kg/m3 的偏高岭土基泡沫土工聚合物（MKFG）。通过 X-CT 分析、分裂霍普金森压力棒（SHPB）试验和分形分析，研究了薄弱环节对 MKFG 的动态力学行为、损伤形态和能量吸收能力（SEAp）的影响。结果表明，MKFG 的连通孔隙率随密度的降低而增加。损坏程度对应变速率的敏感性随着连通孔隙率的升高而降低，这是因为薄弱环节导致了应力集中。应变速率对 MKFG 动态抗压强度的放大效应随着连通孔隙率的增加而减弱。随着连通孔隙率的降低，SEAp 对损坏程度的敏感性也随之升高。最后，模拟结果证实，连通孔隙的分布对 MKFG 的损坏过程有重要影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Impact Engineering 工程技术-工程：机械

CiteScore

8.70

自引率

13.70%

发文量

241

审稿时长

52 days

期刊介绍： The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications