This research is about stress analysis of loosening process of bolted joint of CFRP Plate via contact analysis using FEM. Carbon fiber reinforced plastic (CFRP) has high specific tensile strength and stiffness, and are good for the structures of airplanes and space instruments. In recent years, CFRP becomes to use as the major structure of the large airplane like A380. Since the matrix of CFRP is epoxy resin in general, compressive strength of thickness direction is low and the fastening force of bolted joint of CFRP plate is low than that of metal plate joint When the joint is vibrated by external force, side of the bolt hole is compressed by side of the bolt Then in this research, influence the fastening force of the bolted joint and compression force of side of the bolt hole to the loosening process and the internal stress distribution of CFRP plate is investigated by the analysis of loosening process via FEM contact analysis.
