Investigation of Crack Repairing Technique to Delay Fracture Initiation of Steel Members Subjected to Low Cycle Fatigue

被引：1

作者：

Abeygunasekara, Sampath ^{[1
]}

Gamage, Jeeva Chandanee Pushpakumari ^{[1
]}

Fawzia, Sabrina ^{[2
]}

机构：

[1] Univ Moratuwa, Fac Engn, Dept Civil Engn, Katubedda 10400, Sri Lanka

[2] Queensland Univ Technol, Sch Civil & Environm Engn, Brisbane 4000, Australia

来源：

BUILDINGS | 2023年 / 13卷 / 12期

关键词：

steel members; crack stop hole (CSH); CHS/CFRP hybrid composite; low cycle fatigue; average tensile strength;

D O I：

10.3390/buildings13122958

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Stress concentrations have become a common phenomenon in steel elements when arresting a fracture by implementing the crack stop hole (CSH) technique. Embedding the CSH with Carbon Fibre-Reinforced Polymer (CFRP) enhances the fatigue life by delaying fractures while achieving stiffness recovery due to the superior mechanical characteristics of the CFRP material. Hence, the low cyclic fatigue (LCF) behaviour of 90 strengthened and non-strengthened CSH specimens was examined in this context. These specimens were subjected to a range of 0 to 10,000 fatigue load cycles at a frequency of 5 Hz. At the end of fatigue exposure, the average tensile strength was measured in each case. The application of a CFRP patch on the CSH effectively recovered the strength losses while enhancing the strength in the range of 32% to 45% with respect to the non-strengthened specimens. The developed numerical model based on the cyclic J-integral technique agrees with the test results. This study introduced geometry-related design guidelines for this novel CSH hybrid technique.

引用

页数：16