+高级检索
考虑内部缺陷的FRP拉索力学行为仿真分析
DOI:
作者:
作者单位:

作者简介:

通讯作者:

基金项目:


Finite Element Simulation on Mechanical Behavior of Fiber Reinforced Polymer Cable with Internal Defects
Author:
Affiliation:

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
    摘要:

    通过扫描电子显微镜观测了纤维增强树脂基复合材料(FRP)拉索的内部原始缺 陷形态与结构,基于Python-ABAQUS建立了含孔洞缺陷的微观模型来分析拉索的多尺度力学 行为. 结果表明:孔隙率与孔洞长径比是影响纤维丝等效弹性模量的主要因素,在相同孔隙率 和孔洞体积下,等效弹性模量随孔洞横截面积减小而增大. 由于孔洞分布位置的随机性,数值 模拟得到的纤维丝等效弹性模量比 Mori-Tanaka 理论计算值偏高 . 当纤维丝内部的孔洞的长 径比小于1时,孔洞分布位置对等效弹性模量的影响最大. 基于纤维束的随机破坏本构关系, 采用用户自定义子程序建立了宏观尺度拉索和单筋的多尺度有限元模型,探究了微观和细观 尺度的缺陷对宏观性能的影响 . 最后,采用不同 Weibull 参数与含内部缺陷的纤维束力学参 数,发现FRP单筋和拉索模型的仿真结果与试验结果比较相符.

    Abstract:

    In this study, the scanning electron microscope was employed to examine the morphology of the inter? nal original defects and microstructure of the fiber reinforced polymer (FRP) cable. The microscopic damage model of FRP cable with internal hole and interface defects was established with ABAQUS-Python platform to analyze the multi-scale mechanical behavior of the FRP cable. The results show that the equivalent elastic modulus of the fiber is mainly affected by the porosity and the length-to-diameter ratio of the hole. Specifically, the equivalent elastic modulus increases with the reduction of the holes’cross-sectional area under the same porosity and void volume. Considering the random distribution of the holes, the simulated results of the equivalent elastic modulus of fiber are higher than those obtained by the Mori-Tanaka theoretical calculation. When the length-to-diameter ratio of the holes in the fiber is less than 1, the position of the holes has the greatest influence on the equivalent elastic modulus. Based on the shear-lag theory, the equivalent elastic modulus of the fiber linearly decreases with the interface defect rate, when considering internal interface defects of materials. Based on the random failure constitutive relation of the fiber bundle, multi-scale finite element models of cable and tendon in the macro-scale were established based on the USERMAT, and the influences of micro- and meso- scale defects on the overall performance of composite materials were investigated. Finally, the simulated results of FRP tendon and cable agreed well with the experimental results by considering various Weibull parameters and the mechanical parameters of fiber bundles with internal defects.

    参考文献
    相似文献
    引证文献
文章指标
  • PDF下载次数:
  • HTML阅读次数:
  • 摘要点击次数:
  • 引用次数:
引用本文

朱德举 ,沈琰 ,李晟 ,郭帅成 .考虑内部缺陷的FRP拉索力学行为仿真分析[J].湖南大学学报:自然科学版,2022,49(1):85~93

复制
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2022-03-04
  • 出版日期:
作者稿件一经被我刊录用,如无特别声明,即视作同意授予我刊论文整体的全部复制传播的权利,包括但不限于复制权、发行权、信息网络传播权、广播权、表演权、翻译权、汇编权、改编权等著作使用权转让给我刊,我刊有权根据工作需要,允许合作的数据库、新媒体平台及其他数字平台进行数字传播和国际传播等。特此声明。
关闭