使用数字图像相关性(DIC)方法分析煤矸石混凝土中的裂缝扩展现象

4区 材料科学 Q2 Engineering
Cheng Pan, Zhiming Zheng, Yu Yang
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引用次数: 0

摘要

为研究不同含量煤矸石混凝土的I型裂缝扩展机理,采用数字图像相关法(DIC)对不同含量煤矸石混凝土进行了三点弯曲断裂试验。结果表明,不同含量煤矸石混凝土的I型裂缝扩展过程可分为以下三个阶段:裂缝萌发前的弹性阶段、扩展粘弹性阶段和扩展断裂阶段。煤矸石的含量对裂缝扩展路径有重要影响。煤矸石量越多,裂缝穿透煤矸石粗集料的程度越大,破坏路径的弯曲度越小,裂缝扩展到穿透速度越快。裂缝起始荷载、极限荷载、外力功、重力功和断裂能均随煤矸石含量的增加而减小。DIC 方法和位移伸长计获得的数据非常吻合,这证明 DIC 方法是可行的。根据 DIC 法,在达到裂缝尖端两侧的水平位移之前,水平像素的水平位移非常小,在达到极限荷载后有一个跳跃式的增长。左右两侧有明显的拐点,拐点后水平位移保持不变。裂纹扩展的水平位移场达到极限荷载后,有一个明显的界限,界限逐渐向上延伸,相应的裂纹尖端应变场也逐渐增强。在相同的极限荷载力矩下,煤矸石加入量越多,相应的水平位移和应变场越小。煤矸石混凝土裂缝产生区的形状以裂缝尖端为对称轴,呈 "葫芦形"。裂缝含量越多,裂缝产生面积越大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Crack Propagation Phenomenon in Gangue Concrete Using the Digital Image Correlation (DIC) Method
In order to study the mode I crack propagation mechanism of coal gangue concrete with different contents, the digital image correlation (DIC) method was used to carry out the three-point bending fracture tests on coal gangue concrete with different contents. The results show that the process of the mode I crack propagation of coal gangue concrete with different contents can be divided into three stages as follows: the elastic stage before crack initiation, extended viscoelastic stage, and extended fracture stage. The amount of coal gangue has a significant impact on the crack propagation path. The more the amount of coal gangue, the more the crack penetrates through the coal gangue coarse aggregate, the smaller the bending degree of the failure path, and the faster the crack propagation to the penetration speed. The crack initiation load, ultimate load, external force work, gravity work, and fracture energy all decrease with the increase of the coal gangue content. The data obtained by the DIC method and displacement extensometer are in good agreement, which proves that the DIC method is feasible. Based on the DIC method, before reaching the horizontal displacement on both sides of the crack tip, the horizontal displacement of the horizontal pixel is very small and there is a jump increase after the ultimate load. There are obvious inflection points on the left and right, and the horizontal displacement remains unchanged after the inflection point. After the horizontal displacement field of crack propagation reaches the limit load, there is an obvious limit; the limit gradually extends upward, and the corresponding crack tip strain field is also gradually enhanced. The more the coal gangue is added, the smaller the corresponding horizontal displacement and strain field is at the same limit load moment. The shape of the crack generation area of coal gangue concrete takes the crack tip as the axis of symmetry and is “gourd shaped.” The more the content of the crack, the larger the crack generation area.
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来源期刊
Advances in Materials Science and Engineering
Advances in Materials Science and Engineering Materials Science-General Materials Science
CiteScore
3.30
自引率
0.00%
发文量
0
审稿时长
4-8 weeks
期刊介绍: Advances in Materials Science and Engineering is a broad scope journal that publishes articles in all areas of materials science and engineering including, but not limited to: -Chemistry and fundamental properties of matter -Material synthesis, fabrication, manufacture, and processing -Magnetic, electrical, thermal, and optical properties of materials -Strength, durability, and mechanical behaviour of materials -Consideration of materials in structural design, modelling, and engineering -Green and renewable materials, and consideration of materials’ life cycles -Materials in specialist applications (such as medicine, energy, aerospace, and nanotechnology)
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