Composite bonded structure is a prevalent portion of today’s aircraft structure. Adequate bond integrity critical aspect fabrication and service, especially since many structural bonds are for flight safety. Over the last decade, non-destructive evaluation techniques have improved but still cannot detect structurally weak that exhibits full adherend/adhesive contact. The result expensive time-c...

Transmission spectra of the lowest-order antisymmetric (A0) Lamb wave for adhesively bonded single lap joints are experimentally investigated in a frequency range below 0.4 MHz. Based on theoretical results interference, tangential bond stiffness evaluation method is proposed joints. Aluminum alloy plates with epoxy adhesive different conditions were prepared as specimens. An air-coupled ultras...

Adhesive bonding is increasingly being used for composite structures, especially in aerospace and automotive industries. One common joint configuration to test adhesive strength the single-lap shear joint, which has been widely studied shown produce significant normal (peeling) stresses. When stresses are capable of causing delamination before bond fails, providing inconclusive engineering data...

Joints and interfaces are one of the key aspects design production composite structures. This paper investigates effect adhesive–adherend interface morphology on mechanical behavior wavy-lap joints with aim to improve performance. Intentional deviation from a flat joint plane was introduced in different bond angles (0°, 60°, 90° 120°) were subjected quasi-static tensile load. Comparisons made r...

Bonded joints used in wing sections and frames of aircraft structures are mostly exposed to cyclic loadings instead static ones during their services. Bending types dynamic encountered. In this study, the fatigue response a single lap joint (SLJ) bending loading was studied with developed advanced finite-element (FE) model. The cohesive zone model describing behaviour adhesive layer damage mech...

The effects of joint geometry parameters, such as adherend thickness (1.76, 3.52 mm), width (10, 20, 30 and overlap length 20 on the behavior single-lap joints (SLJs) under tensile loading are investigated in this study. Peak force, stiffness, shear stress, normal stress properties. SLJs manufactured with carbon fiber composite adherends two different types adhesives, polyurethane epoxy, which ...

Development of tough, reusable adhesives is important, but remains a major challenge, especially in water. A tough adhesive that resets entirely to its virgin condition when needed reported using caffeic acid. Here, acid employed as moiety achieve such the functions due dual characteristics: an from mussel-inspired catechol and photo-reversible crosslink cinnamic Adhesion involves two-step proc...

Single-lap shear (SLS) joints are straightforward to manufacture. This makes them especially attractive for testing polymer composite welded joints. Owing local heating, which is characteristic of welding processes, the production more geometrically intricate (such as double-lap or scarfed joints) bigger end-notched flexure double cantilever beam) typically entails significant complexity in des...

Adhesively bonding has been increasingly used for numerous industrial applications to meet the high demand lightweight and safer structures. Debonding of adhesively bonded joints is a typical mixed mode failure process. It highly depended on interactional effects material properties geometric definitions constituents, which very complicated. The existing studies in identifying fracture modes ba...