Analysis of Fractal and Energy Consumption Characteristics of Concrete under Impact Loading

IF 1.2 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geofluids Pub Date : 2021-10-25 DOI:10.1155/2021/2370363

Yutao Li, Faning Dang, Mei Zhou, Jie Ren

{"title":"Analysis of Fractal and Energy Consumption Characteristics of Concrete under Impact Loading","authors":"Yutao Li, Faning Dang, Mei Zhou, Jie Ren","doi":"10.1155/2021/2370363","DOIUrl":null,"url":null,"abstract":"<div>\n <p>In order to study the compressive deformation and energy evolution characteristics of concrete under dynamic loading, impact compression tests with impact velocities of 5, 6, and 7 m/s were carried out on concrete samples with aggregate volume ratios of 0, 32%, 37%, and 42%, respectively, using a split Hopkinson pressure bar test apparatus. The broken concrete pieces after destruction were collected and arranged. The fractal characteristics of fragmentation distribution of concrete specimens with different aggregate rates under impact were discussed, and the roughness of the fragment surface was characterized by the fractal dimension of the broken fragment and the crack surface energy was calculated. In addition, the analytical equation of the fractal dimension of the broken fragment and the crack surface energy was established. The relationship between the specimen energy absorption and the crack surface energy was compared and analyzed. The results show that the concrete specimens are mainly tensile split failure modes under different impact speeds. The fractal dimension, absorption energy, and crack surface energy all increase with the increase in impact speed and decrease with the increase in the aggregate rate. When the aggregate rate is different, the effective utilization rate of the absorbed energy is the largest when the aggregate content is 37%. The surface energy of the crack can be used to estimate the concrete dynamic intensity.</p>\n </div>","PeriodicalId":12512,"journal":{"name":"Geofluids","volume":"2021 1","pages":""},"PeriodicalIF":1.2000,"publicationDate":"2021-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/2021/2370363","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geofluids","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1155/2021/2370363","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}

引用次数: 0

Abstract

In order to study the compressive deformation and energy evolution characteristics of concrete under dynamic loading, impact compression tests with impact velocities of 5, 6, and 7 m/s were carried out on concrete samples with aggregate volume ratios of 0, 32%, 37%, and 42%, respectively, using a split Hopkinson pressure bar test apparatus. The broken concrete pieces after destruction were collected and arranged. The fractal characteristics of fragmentation distribution of concrete specimens with different aggregate rates under impact were discussed, and the roughness of the fragment surface was characterized by the fractal dimension of the broken fragment and the crack surface energy was calculated. In addition, the analytical equation of the fractal dimension of the broken fragment and the crack surface energy was established. The relationship between the specimen energy absorption and the crack surface energy was compared and analyzed. The results show that the concrete specimens are mainly tensile split failure modes under different impact speeds. The fractal dimension, absorption energy, and crack surface energy all increase with the increase in impact speed and decrease with the increase in the aggregate rate. When the aggregate rate is different, the effective utilization rate of the absorbed energy is the largest when the aggregate content is 37%. The surface energy of the crack can be used to estimate the concrete dynamic intensity.

Abstract Image

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

冲击荷载作用下混凝土的分形及能耗特性分析

为了研究混凝土在动载作用下的压缩变形和能量演化特征，采用分离式霍普金森压杆试验装置，对骨料体积比为0、32%、37%和42%的混凝土试样分别进行了冲击速度为5、6和7 m/s的冲击压缩试验。对破坏后的混凝土碎片进行收集整理。讨论了不同集料率混凝土试件在冲击作用下破碎块分布的分形特征，用破碎块的分形维数表征了破碎块表面的粗糙度，并计算了裂纹表面能。建立了破碎块的分形维数与裂纹表面能的解析方程。对比分析了试样能量吸收与裂纹表面能之间的关系。结果表明:在不同冲击速度下，混凝土试件主要表现为拉伸劈裂破坏模式;分形维数、吸收能和裂纹表面能均随冲击速度的增加而增大，随团聚率的增加而减小。当骨料含量不同时，当骨料含量为37%时，吸收能量的有效利用率最大。裂缝的表面能可以用来估计混凝土的动强度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Geofluids 地学-地球化学与地球物理

CiteScore

2.80

自引率

17.60%

发文量

835

期刊介绍： Geofluids is a peer-reviewed, Open Access journal that provides a forum for original research and reviews relating to the role of fluids in mineralogical, chemical, and structural evolution of the Earth’s crust. Its explicit aim is to disseminate ideas across the range of sub-disciplines in which Geofluids research is carried out. To this end, authors are encouraged to stress the transdisciplinary relevance and international ramifications of their research. Authors are also encouraged to make their work as accessible as possible to readers from other sub-disciplines. Geofluids emphasizes chemical, microbial, and physical aspects of subsurface fluids throughout the Earth’s crust. Geofluids spans studies of groundwater, terrestrial or submarine geothermal fluids, basinal brines, petroleum, metamorphic waters or magmatic fluids.