A cohesive mixed-mode damage model appropriate for ductile adhesives is presented.
A fine-tune analysis of damage evolution between subsequent impacts using a numerical procedure including a cohesive mixed-mode damage model was also performed.
The numerical model used ABAQUS® software and a developed cohesive mixed-mode damage model adequate for ductile adhesives, and implemented within interface finite elements.
A numerical analysis including a cohesive mixed-mode damage model was performed considering different mixed-mode loading conditions to evaluate the test performance.
A finite element analysis including a cohesive mixed-mode damage model was performed in order to better understand the interaction between the resulting delamination and the presence of holes.
Experimental tests and numerical analyses using a trapezoidal cohesive mixed-mode damage model demonstrated the good performance of the new method, namely when compared to classical data reduction schemes.
The present work is dedicated to the study of single and double-lap repairs on composite materials, using the ABAQUS® software and special developed interface finite elements including a cohesive mixed-mode damage model based on the indirect use of Fracture Mechanics.
Results from experimental testing of various aluminium epoxy butt-joints have been obtained and compared with model prediction showing a good correlation regardless the kind of rupture (adhesive, cohesive or mixed mode failure).
Also the fractured specimens of each group were examined under a stereomicroscope equipped by a digital camera attached to the stereomicroscope (Olympus, SZM9) with ×16 magnifications, and the type of bond failure (adhesive, cohesive, or mixed) was recorded.
Three possible failure modes are considered in this study: cohesive in the concrete substrate, mixed, and adhesive at the interface.
While Light Bond™ system showed adhesive (84%), mixed (10%), and cohesive (6%) failure patterns, Transbond XT™ exhibited adhesive (86%), mixed (0%), and cohesive (4%) fracture types.
