In the present work, miniature, single-lap joint specimens with a single truncated square pyramid interlocking profile, centred in the bond area, are investigated.
Tensile shear strengths of up to 3000 psi (21 MPa) may be attained in the bond area through the use of this assembly technique.
Based on the evolution of average state variables in the bond area, ultrasonic welding process could be divided into three periods.
A number of tests were used to inspect the interfacial zone in the bonding area of NSM CFRP strips, including physical examination, pore structure analysis, and three-dimensional laser profilometery analysis.
This scale ranges from 0 to 3. A score of 0 indicates no resin remaining on the tooth in the bonding area; 1 indicates less than half of the resin remaining on the tooth; 2 indicates more than half of the resin remaining on the tooth; and 3 indicates all resin remaining on the tooth, with a distinct impression of the bracket base.
This scale ranges from 0 to 3. A score of 0 indicates no adhesive remaining on the tooth in the bonding area; 1 indicates less than half of the adhesive remaining on the tooth; 2 indicates more than half of the adhesive remaining on the tooth; 3 indicates all adhesive remaining on the tooth.
In contrast, the bond area in embedding rectangular or round shaped FRP is comparatively smaller compared with plate typed FRP.
Complex interactions between mechanical and hygro-expansive properties take place in the bonding areas, affecting the overall material response.
The tight control of adhesive thickness in large bonding areas such as the secondary barrier of CCS (cargo containment system) for LNG Liquefied Natural Gass) carriers or floaters is difficult and expensive although the adhesive thickness is a dominant parameter to determine the bonding performance of adhesively bonded joint, especially at cryogenic temperatures.
The strap ultimate load was very sensitive to minor initial damage at the tape edges as well as to stress concentrations in the fusion-bonding area.
The results showed that the load-carrying capacity of scarf joints decreases with the size of the bondline flaw at a faster rate than the reduction in the effective bond area.
