Functionally graded joints by dielectric heating

摘要: The most traditional methods of fastening such as bolts or rivets have been used for decades. However, these cause stress concentrations and premature failure in materials, while adhesive bonds spread the load more evenly over surface, facilitating a lighter and cheaper overall structure. That is main reason why adhesively bonded joints are increasingly aerospace automotive industries. The single lap joint (SLJ) with metallic composite flat plates common mainly due to its simplicity efficiency. one major drawback associated to this occurrence shear peel at end the adhesive layer. This leads failures ends overlap. The objective present project use an functionally modified and cured by dielectric heating. allows uniform distribution along the overlap would permit work much smaller areas, reducing considerably the weight structure give reliable joints. In two ways obtain graded were tested. first way was to obtain cure using different local microwave absorbing particles (carbon black) overlap. interact the magnetic field heat adhesive. second carbon black to reinforce mechanical properties overlap and cure isothermally heating. Then, preliminary experimentation done order determine viability of main objectives. results proved impossibility perform a graded several factors conductivity the adherends non uniformity magnetic field. Therefore, second methodology proposed achieve followed. effect carbon black studied manufactured and tested. Finally, obtained discussed analyzed. Bulk tensile tests showed an improvement ductility function concentrations. Thus, SLJs high concentration of the made ductile higher strength was obtained lower concentrations. Also, prediction done. For analytical model gave accurate predictions. for predictions were too hypotheses explain this.