Investigating stress distribution of crimped SMA fibers during pullout behavior using experimental testing and a finite element model

Ho Ha Vinh; Choi Eunsoo; Park Sang Ju

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Investigating stress distribution of crimped SMA fibers during pullout behavior using experimental testing and a finite element model

机译：使用实验检测和有限元模型研究拉出行为中卷曲SMA纤维的应力分布

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This work enabled better understanding of crimped fiber's pullout behavior and investigated the cross-sectional and longitudinal stress distribution, including embedded portions and free portions. A finite-element model in ABAQUS software was used to investigate the stress distribution of crimped fibers. The peak stresses of crimped fibers are at the concave bellies of crimped waves, whereas the peak stresses in the mortar matrix are at the convex sides of the waves. In a cross-section of the embedded portion, the elements were tensioned and compressed repeatedly, while in a cross-section of the free portion, the elements were only tensioned. The maximal stress in both portions was at the elements at the upper or lower of the crimped waves. In the embedded portion, the compressive stress and tensile stress at the odd and even summit waves were linear functions of the distance from the summit points to the embedded portion's end. In the free portion, the stress was distributed unevenly along the wavelength; thus, the pullout stress varied along the free length of crimped fiber depending on the chosen point.

机译：这项工作使得能够更好地了解卷曲光纤的拉出行为，并研究了横截面和纵向应力分布，包括嵌入部分和自由部分。 ABAQUS软件的有限元模型用于研究压接纤维的应力分布。卷曲纤维的峰值应力位于卷曲波的凹入腹部，而砂浆基质中的峰值应力位于波的凸起侧。在嵌入部分的横截面中，元件重复张紧和压缩，而在自由部分的横截面中，该元件仅张紧。两个部分中的最大应力位于卷曲波的上部或下部的元件处。在嵌入部分中，奇数和偶数波浪处的压缩应力和拉伸应力是从峰值点到嵌入部分的端部的距离的线性函数。在自由部分中，应力沿波长不均匀地分布;因此，取决于所选点，拉伸应力沿着卷曲纤维的自由长度而变化。

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来源
《Composite Structures》 |2021年第9期|114254.1-114254.16|共16页
作者
Ho Ha Vinh; Choi Eunsoo; Park Sang Ju;
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作者单位

Hongik Univ Dept Civil Engn Seoul 04066 South Korea;

Hongik Univ Dept Civil Engn Seoul 04066 South Korea;

Hongik Univ Sch Elect & Elect Engn Seoul 04066 South Korea;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Crimped fiber; NiTi SMA; Pullout behavior; Stress distribution;

机译：卷曲纤维;NITI SMA;拉出行为;压力分布;

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2. Finite element simulation of bond-zone behavior of pullout test of reinforcement embedded in concrete using concrete damage-plasticity model 2 (CDPM2) [J] . Seok Seungwook, Haikal Ghadir, Ramirez Julio A., Engineering Structures . 2020,第Octa15期

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5. Effects of surface plasma treatments, elastomeric interphase layers and rubber tougheners on carbon-fiber/epoxy composite properties: Preparation, finite element modeling, mechanical testing and NDE. [D] . Li, Wei. 1997

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6. Active Reinforcing Fiber of Cementitious Materials Using Crimped NiTi SMA Fiber for Crack-Bridging and Pullout Resistance [O] . Eunsoo Choi, Ha Vinh Ho, Jong-Su Jeon 2020

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7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

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Investigating stress distribution of crimped SMA fibers during pullout behavior using experimental testing and a finite element model

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