Mechanical behaviour of steel pipes reinforced with composite materials and steel

The metal pipes are particularly vulnerable to internal and external constraints or geometric instability, and their sizing is effected by using simplified rules. Indeed, these pipes are very sensitive to the slightest imperfection or initial geometric operation (accidental loads, temperatures, etc.). Taking into account the various damage generally leads to a loss of bearing capacity. To reserve the potential burden of these pipes, it is necessary to strengthen them. In this study we have made the strengthening of steel pipes with metallic materials and composites in the presence of compressive stresses. One or more layers of composite are bonded to the discontinuity of the pipe. The analytical treatment for this type of problem is complex and therefore we use numerical modeling using the code ABAQUS. The results show that the correct fiber orientation relative to the advance of the crack affects a significant effect on reduction of FIC. The properties of the membership must be optimized to increase performance of the repair piece over. Reducing the FIC becomes important when others decrease.