Experimental Research of Mechanical Unions Pinned Pre Tension, No Tension and Bonded in Composite Low Module

In recent years the joints mechanically bolted and glued has drawn the attention of the scientific community, the growth of its applications in various sectors of engineering. An advantageous feature of mechanical joints is the low sensitivity to surface preparation, service temperature or humidity. In addition to allowing the removal of a greater number of times without damaging the structure. In parallel to the study of the joints mechanically fixed by screws, automotive and aerospace industries boosted the use of adhesives in glue joints in the assembly of structures, due to advantages such as better stress distribution, union capacity in different materials and reducing fatigue when compared to traditional methods of union. The strength of a glued joint are also influenced by various parameters; the thickness of the cord, the preparation of the adhering surface, the geometry of the joint, the type of glue used, the operating temperature and the humidity. The objective of this work is to extend the experimental study to investigate the influence of bolt preload on the failure modes compared to fixed together by pin without torque and compared with the resistance of a glued joint, used in laminated composites cotton reinforced with vegetable fibers. The applied preload moments were taken as 0 and 5 Nm concluded that the tensile failure mode either pure or combined, was present in all configurations of the joints pinned.; the shortcomings of tension occurred in the samples submitted to the torque of 5.0 Nm in every relationship E/d the breaking load distribution in the composite gasket can be adjusted by varying some geometrical parameters of the sample. Keywords— articulate, clearance, failure modes, geometry, maximum capacity, preload, , momentum, , scanning electron microscopy.