Study On Mechanical Properties And Thermal Environment Adaptability Of Adhesive-multi Pin Metal-composite Structure

In this paper,a novel joining method between metallic and composite materials was developed to enhance the mechanical performance of metal-composite hybrid structures.According to this method,the metallic and composite components are adhesively bonded together and there are also thin pins in the overlap region running through the metals and composites.The pins are bonded together with the joined components as well.Comparatively tensile tests were conducted on the metal-composite joints so as to investigate the advantages of the new joining method.The load-displacement relationships and fracture modes were analyzed in accordance with the test results of the two different types of joints.The results show that the proposed joining method can improve ultimate failure load,failure displacement and energy absorption capacity significantly.Furthermore,the novel joining method decreases the suddenness of the failure of the joint.Finite element models were developed to investigate the enhancement mechanism of the proposed method.Through the analysis of the failure process,it can be concluded that there are bridging force between the pins and the jointed components and the bridging force not only transfers load between the connected components together with the adhesive layer,also inhibits the adhesive layer from peeling.Tests in different temperature environments were conducted to study thermal environment adaptability of hybrid metal-composite structure.The results demonstrate that compared with the adhesive-multi pin joints,the failure load of the adhesive joint is more obvious and has a stronger sensitivity to the temperature.These properties make the applicability of the adhesive-multi pin joint wider than adhesive joint.