{"title":"偏高岭土基发泡土工聚合物(MKFG)在动态加载下的力学行为","authors":"","doi":"10.1016/j.ijimpeng.2024.105106","DOIUrl":null,"url":null,"abstract":"<div><p>In this study, metakaolin-based foam geopolymer (MKFG) with densities of 400 kg/m<sup>3</sup>, 600 kg/m<sup>3</sup>, and 800 kg/m<sup>3</sup> were prepared. The effect of weak links on the dynamic mechanical behavior, damage morphology, and energy absorption capacity (<em>SEA</em><sub>p</sub>) 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 <em>SEA</em><sub>p</sub> 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.</p></div>","PeriodicalId":50318,"journal":{"name":"International Journal of Impact Engineering","volume":null,"pages":null},"PeriodicalIF":5.1000,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0734743X24002318/pdfft?md5=5ff77ac137d8a4e5cc83805243bdf96e&pid=1-s2.0-S0734743X24002318-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Mechanical behaviors of metakaolin-based foamed geopolymer (MKFG) under dynamics loading\",\"authors\":\"\",\"doi\":\"10.1016/j.ijimpeng.2024.105106\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this study, metakaolin-based foam geopolymer (MKFG) with densities of 400 kg/m<sup>3</sup>, 600 kg/m<sup>3</sup>, and 800 kg/m<sup>3</sup> were prepared. The effect of weak links on the dynamic mechanical behavior, damage morphology, and energy absorption capacity (<em>SEA</em><sub>p</sub>) 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 <em>SEA</em><sub>p</sub> 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.</p></div>\",\"PeriodicalId\":50318,\"journal\":{\"name\":\"International Journal of Impact Engineering\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.1000,\"publicationDate\":\"2024-09-06\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S0734743X24002318/pdfft?md5=5ff77ac137d8a4e5cc83805243bdf96e&pid=1-s2.0-S0734743X24002318-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Impact Engineering\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0734743X24002318\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Impact Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0734743X24002318","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
Mechanical behaviors of metakaolin-based foamed geopolymer (MKFG) under dynamics loading
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 (SEAp) 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 SEAp 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.
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