Gao Qinglin participated in the "ICCS 26" and gave an outcome presentation
Time: 2023/08/03 Publisher： oiginal Views：
The 26th International Conference on Composite Structures & 8th International Conference on Mechanics of Composites (ICCS26 & MECHCOMP8) were held at University of Porto, Portugal, from 27th to 30th June, 2023.
The conference received the support of Composite Structures (JCR Q1, IF=6.4), an international journal from Elsevier. It is a hybrid event, with oral sessions, as well as online presentations (live and repository) with a total of more than 270 experts and scholars. Prof. Xin Haohui, Principal Investigator of NEXCEL 2023 Ph.D project "Research on fatigue-creep coupling mechanism of glass-fiber reinforced resin composites" and Gao Qinglin, Ph.D student, participated in the "ICCS26" and delivered a presentation titled “Research on axial fatigue behavior of web-flange junctions of pultruded GFRP profile”.
The application of glass fiber reinforced polymer (GFRP) in bridge structures is conducive to the breakthrough of bridge span and the extension of service life. Since 1980s, GFRP has been increasingly applied to highway bridge structures. Thanks to its relatively lower cost, compared with that of carbon fiber reinforced polymer(CFRP), it is still favored by many researchers nowadays. However, due to the limited capability of the pultrusion process, it is usually difficult to maintain sufficient fiber continuity and volume at the junction of GFRP profiles' web(s) and flanges, creating a typical matrix-dominated zone and fabric folds. Therefore, the web-flange junction of the majority of commercially GFRP profiles often fails prematurely.
The bridge structure is greatly affected by the vehicle dynamic loading during service, which highlights the issue of fatigue durability. In response to this problem, the axial fatigue behavior of the web-flange junction (WFJ) of pultruded GFRP profiles was studied. The tension-tension and the compression-compression fatigue experiments of the WFJ were carried out based on the tensile and compressive static tests. The fatigue life and failure mode of the WFJ under different loading levels are obtained. The variation of stiffness and energy dissipation capacity during fatigue loading were evaluated. In addition, DIC technology is used to monitor the change of folded mats location in the junction, and the fatigue damage process and mechanism of the junction are deeply explored. This research provides a strong support for the design of GFRP structures and promotes the application of composite materials in bridge engineering.
