Effect of Displacement Rate on Delamination Growth Rate in Unidirectional Glass Fiber Composites in Both Bridging and Non-Bridging Scenarios

Authors

Wafaa Ahmed Shaker, Department of Railway Technology, Faculty of Industrial and Energy Technology, Borg Al-Arab Technological UniversityFollow
Taher H. Awad, Department of Mechanical Engineering, Faculty of Engineering, Alexandria University, Alexandria, EgyptFollow
Mostafa M. Elhadary, Department of Mechanical Engineering, Faculty of Engineering, Alexandria University, Alexandria, EgyptFollow

Corresponding Author

Wafaa A. Shaker

Subject Area

Material Science and Engineering

Article Type

Original Study

Abstract

Experimentally, the mode I delamination behavior of unidirectional glass/epoxy composites at quasi-static displacement rates of 1, 3, and 5 is explored. When comparing the variation between fracture toughness GIC values at 1 mm/min and GIC at 3 mm/min, the average variation is 30% increasing. However, the average variance in GIC between 3 mm/min and 5 mm/min is increasing by 11%. As a result, the crack propagation velocity has a noticeable effect on the value of GIC at lower speeds and a limited effect at higher speeds. The same comparison is made with bridging specimens for 1 and 3 mm/min displacement rates; the average variation is a 37% reduction, which contradicts the non-bridging case. Fiber bridging causes the measured fracture toughness to be overestimated while concealing the displacement rate effect, according to our findings. It is apparent that the bridging phenomenon reflected the variation value in the bridging case. The specimens with a 5 mm/min displacement rate, on the other hand, did not produce the expected bridging and instead operated as non-bridging specimens. The viscoelastic nature of composites can be associated with these findings.

Keywords

Bridging; Displacement rate; Glass fiber; Composites; Delamination; Fracture toughness

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 License.

Recommended Citation

Shaker, Wafaa Ahmed; Awad, Taher H.; and Elhadary, Mostafa M. (2025) "Effect of Displacement Rate on Delamination Growth Rate in Unidirectional Glass Fiber Composites in Both Bridging and Non-Bridging Scenarios," Mansoura Engineering Journal: Vol. 49 : Iss. 5 , Article 16.
Available at: https://doi.org/10.58491/2735-4202.3246