The Effect of Crack Position and Applied Force on Fatigue Delamination Behavior of GFRP's in Mixed Mode Test

Alkaood, Abdalla H.; Gomaa, Adbelhamid I.; El Fahham, Ibrahim. M.; Mohamed, Yasser. S.

doi:10.24200/sci.2025.64812.9144

The Effect of Crack Position and Applied Force on Fatigue Delamination Behavior of GFRP's in Mixed Mode Test

Articles in Press

Document Type : Research Article

Authors

Abdalla H. Alkaood

Adbelhamid I. Gomaa

Ibrahim. M. El Fahham

Yasser. S. Mohamed

Department of Mechanical Engineering, Alexandria University, Faculty of Engineering, Alexandria, Egypt

10.24200/sci.2025.64812.9144

Abstract

The present study focuses on the investigation of fatigue characteristics of fibrous composite materials with mixed mode delamination. An experimental approach was adopted, wherein a newly designed testing device was utilized to conduct fatigue tests under constant loading conditions at ambient temperatures. The tests were carried out at constant speed at 10 Hz using a variable speed drive to control the frequency. The influence of initial crack size on different forces was examined by testing rectangular specimens with fiber orientations of [0, 90º]16s. The specimens were fabricated using woven roving E-glass fibers and polyester resin. The test results revealed that the delamination propagation was highest in the upper quarter of the specimens' cross section under various applied forces. Additionally, the cracks in the middle and lower quarters of the cross section exhibited similar propagation behavior. The study also discussed the relationship between cycles to failure, crack length, and the impact of delamination on the fatigue life of the specimens.

Keywords

testing machine

mixed mode bending test (MMB)

delamination

fatigue

crack

polyester and glass fiber

Subjects