东南大学学报（自然科学版）2024，Vol.54Issue(2)：294-302,9.DOI:10.3969/j.issn.1001-0505.2024.02.006
定向钢纤维增强水泥基复合材料准脆性断裂分析
Analysis on quasi-brittle fracture performance of aligned steel fiber reinforced cement-based composites
摘要
Abstract
Based on the basic theory of the boundary effect model,the relationship between steel fiber length and characteristic crack length was established,thus the equivalent fracture toughness and tensile strength of aligned steel fiber reinforced cement-based composites(ASFRC)were calculated,and then fracture failure curves of ASFRC were obtained.The results show that more reasonable values of the equivalent fracture toughness and tensile strength can be obtained when the discrete number is taken as 0.4-0.7 and 0.2-0.4,re-spectively.Comparing the fracture failure curves of ASFRC and steel fiber reinforced cement-based composites(SFRC),it can be found that the minimum specimen size satisfying linear elastic fracture mechanics increases with the increase of the discrete number.In addition,the tensile strength and the nominal stress considering the influence of the initial crack length of ASFRC and SFRC decrease with the increase of the discrete number.Furthermore,the improved simplified analytical formulas can not only determine the equivalent fracture tough-ness and tensile strength,but also predict the damage of the specimens.关键词
定向钢纤维增强水泥基复合材料/边界效应模型/等效断裂韧度/拉伸强度/断裂破坏曲线Key words
aligned steel fiber reinforced cement-based composites/boundary effect model/equivalent fracture toughness/tensile strength/fracture failure curves分类
建筑与水利引用本文复制引用
慕儒,王晶晶,卿龙邦,李杨,管俊峰..定向钢纤维增强水泥基复合材料准脆性断裂分析[J].东南大学学报（自然科学版）,2024,54(2):294-302,9.基金项目
国家自然科学基金资助项目(52022027)、河北省自然科学基金资助项目(E2022202141,E2023202268)、河北省高层次人才资助项目(A202101011). （52022027）
