Combine experimental and FEM analysis of adhesive bonded single lap joint with Al-alloy flat adherends and pre-embedded artificial defects

Abstract

Adhesive bonded lap joint is considered to be better substitute to riveted or welded joints for aerospace, marine and structural applications. It is due to the ability to develop relatively lower stress concentration and fatigue severity in highly dynamic environment. In real practice, there are defects present in the joint interface that decide the strength and durability of the component. Hence, it is required to understand the joint strength with different defect geometries. In this paper, a combined experimental and finite element method is conducted to evaluate the strength of lap joint of Al-alloy flat plate, pre-embedded with defects of various geometries: square, rectangle, circular and elliptical. The results of experimental and FEM analysis are converging, and indicate the clear variation of strength due to different type of defects. It encourages further analysis.

Effects of Curing Defects in Adhesive Layers on Carbon Fiber–Quartz Fiber Bonded Joint Performance

“…The mechanical test specimens for five groups with the same defect type can be taken out along the length of the laminate, and the subsequent area ratio of prefabricated defects is the ratio of the defect area to the adhesive area in the individual specimen. Combined with the defect prefabrication method in reference [27], the morphologies of the prefabricated defects were designed as triangle, rectangle, ellipse and circle through the pre-embedded PTFE [28,29]. Despite the fact that the formation mechanism of PTFE defects is different from that of actual void defects, the effect of the defect parameters, such as morphology, number and location, is similar on the failure mechanism of joints.…”

“…The load first increased and then irreversibly decreased, which is similar to the evolution force law in refs. [27,32]. Compared with the analysis of multiple force-displacement curves, the ILSS analysis is utilized to better reflect the effect of defects in adhesive film and process parameters on joint performance.…”