钢纤维增强水泥基复合材料增韧机理研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (5): 1522-1528.

钢纤维增强水泥基复合材料增韧机理研究

曲博扬, 卿龙邦

河北工业大学土木与交通学院,天津 300401

收稿日期:2022-01-13 修回日期:2022-02-23 出版日期:2022-05-15 发布日期:2022-06-01
通讯作者: 卿龙邦,博士,教授。E-mail:qing@hebut.edu.cn
作者简介:曲博扬(1995—),男,硕士研究生。主要从事混凝土断裂力学研究。E-mail:279974197@qq.com
基金资助:
国家自然科学基金(52022027,51878239)

Toughening Mechanism of Steel Fiber Reinforced Cement Matrix Composites

QU Boyang, QING Longbang

School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China

Received:2022-01-13 Revised:2022-02-23 Online:2022-05-15 Published:2022-06-01

摘要/Abstract

摘要： 钢纤维可有效阻碍水泥基材料中微裂缝的产生和发展,提高其抗裂能力。基于Eshebly等效夹杂理论和最大周向应力准则,获得了平面应力条件下无限大薄板中裂缝与钢纤维相互作用的应力强度因子(SIF)解,推导了掺入纤维后的Ⅰ-Ⅱ复合型断裂裂缝尖端最大应力表达式。根据掺入钢纤维前后裂缝尖端最大应力比,分析了钢纤维方向、位置和弹性模量对增韧效果的影响。结果表明,钢纤维通过改变裂缝尖端应变场,影响应力强度因子,从而降低尖端最大应力。当钢纤维方向与裂缝方向垂直时,裂缝尖端最大应力比最小,定向后钢纤维的增韧效果最明显。钢纤维的增韧效果主要受纤维方向影响,而受纤维弹性模量的影响小。

关键词: 钢纤维增强水泥基复合材料, 复合型断裂, 定向钢纤维, 应力强度因子, 最大周向应力准则, 增韧机理

Abstract: Incorporating steel fibers into cement-based materials effectively prevent the generation and development of microcracks, thus improve anti-crack performance. The stress intensity factor (SIF) solution of the interaction between the crack and steel fiber in the infinite plate under plane stress condition was obtained through the Eshebly equivalent inclusion theory and the maximum circumferential stress criterion. The maximum stress expression of the crack tip of Ⅰ-Ⅱ combined fracture mode with fiber was derived. Through the maximum stress ratio of crack tip after adding steel fiber, the direction, location and the elastic modulus of steel fiber on toughening effect were analyzed. The results show that, the maximum stress around crack tip is reduce by changing the strain field and SIF. The maximum stress ratio of crack tip reaches the minimum value when the steel fiber is perpendicular to the crack and the toughening is significantly affected after steel fiber aligning. Further more, the calculation result shows that the direction of steel fiber is the major factor on toughening effect and little effect on the elastic modulus of steel fiber.

Key words: steel fiber reinforced cement matrix composite, combined fracture, aligned steel fiber, stress intensity factor, maximum circumferential stress criterion, toughening mechanism

中图分类号:

TU528

曲博扬, 卿龙邦. 钢纤维增强水泥基复合材料增韧机理研究[J]. 硅酸盐通报, 2022, 41(5): 1522-1528.

QU Boyang, QING Longbang. Toughening Mechanism of Steel Fiber Reinforced Cement Matrix Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1522-1528.

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