定向钢纤维增强水泥基复合材料断裂细观数值模拟研究
DOI:
作者:
作者单位:

河北工业大学

作者简介:

通讯作者:

中图分类号:

基金项目:


Meso-Numerical Simulation Research on the Fracture of Aligned Steel Fiber Reinforced Cementitious Composites
Author:
Affiliation:

Hebei University of Technology

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    通过开展钢纤维与水泥基体的拉拔试验,获得了不同角度的拉拔力-位移曲线,进而建立了随机乱向及定向钢纤维增强水泥基复合材料(SFRC、ASFRC)细观有限元数值模型.计算了不同纤维掺量的SFRC和ASFRC三点弯曲梁断裂全过程,并结合断裂试验对细观数值模型进行了验证,研究了定向钢纤维的细观增强机理.研究表明,拉拔力峰值随纤维倾斜角度呈现先增大后减小的趋势;SFRC试件和ASFRC试件的峰值荷载均随纤维掺量增加而增大,当纤维掺量为0.8%、1.2%、2.0%时,ASFRC试件的峰值荷载较SFRC试件约提高了75%、111%、141%;模拟与试验所得SFRC试件和ASFRC试件荷载-裂缝张开口位移(P-CMOD)全曲线对比较好,峰值荷载的误差在10%以内;相同纤维掺量下,ASFRC试件纤维合力最大值较SFRC试件有大幅度提升,表明钢纤维定向后可以显著提高利用率,延缓裂缝的产生和扩展.

    Abstract:

    Through the pull-out test of steel fiber and cement matrix, obtained the force-displacement curves of different angles, and then the random and aligned steel fiber reinforced cementitious composites (SFRC, ASFRC) meso finite element numerical model were established. The whole fracture process of SFRC and ASFRC three-point bending beams with different fibers content is calculated, and the meso-scale numerical model is verified by the fracture test, the meso-reinforcement mechanism of aligned steel fiber is studied. The research show that, the peak pull-out force first increases and then decreases with the fiber inclination angle; the peak loads of the SFRC specimens and ASFRC specimens both increase with the increase of the fibers content, when the fibers content is 0.8%, 1.2% and 2.0%, the peak load of the ASFRC specimens is about 80%, 105% and 114% higher than that of the SFRC specimens; the whole load-crack opening displacement (P-CMOD) curves of test and numerical simulation have a good suitable, which obtained from the SFRC specimens and the ASFRC specimens, and the error of the peak load is within 10%; under the same fibers content, the maximum fibers force of the ASFRC specimens is greatly improved compared with the SFRC specimens, indicating that the utilization rate can be significantly improved after the steel fibers are aligned, delay the generation and expansion of cracks.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2021-12-03
  • 最后修改日期:2022-03-22
  • 录用日期:2022-03-22
  • 在线发布日期:
  • 出版日期: