Cold expansion method is used to protect a fatigue fracture from fastener hole in the structure and aerospace industry. Cold expansion is that an oversized tapered mandrel goes through the hole and produces a compressive residual stress as well as plastic deformation around the hole. Here, mandrel shapes are one of the factors which are influenced on the residual stress distribution by cold expansion method. This paper, according to mandrel shapes (diameter of mandrel, length of mandrel and length of taper), we are performed a finite element analysis of residual stress distribution by cold expansion method. From this study, it has been found that diameter of mandrel and length of taper are an important factor which was generated a low compressive residual stress surround of fastener hole by cold expansion method.
Pavier, M. J., 'A finite element simulation of the cold working process for fastener holes,' J. Strain Anal., Vol. 32, pp. 287-300, 1997
Papanikos, P. and Mequid, S. A., 'Elasto-plastic finite element analysis of the cold expansion of adjacent fastener holes,' J. Mater. Process. Technol., Vol. 89-90, pp. 424-428,1999
Jang, J. S., Yang, W. H. and Kim, C., 'Analysis for the residual stress by cold expansion method and interference fit,' J. Korea. Soc. of Mech. Eng., Vol. 26, No. 8, pp. 1615-1622, 2002
Kim, C., Kim, D. J., Seok, C. S. and Yang, W. H., 'Finite element analysis of the residual stress by cold expansion method under the influence of adjacent holes,' J. Mater. Process. Technol., Vol. 153-154, pp. 986-991,2004
Chakherlou, T. N. and Vogwell, J., 'The effect of cold expansion on improving the. fatigue life of fastener holes,' Eng. Fail. Analy., Vol. 10, pp. 13-24, 2003
Yoo, J. S., Choi, S. Y., Song, J. H., Song, C. H. and Lim, W. K., 'Fatigue Crack Retardation by Concurrent Cold-Expansion and Ring-identation,' J. Korea. Soc. of Mech. Eng., Vol. 21(A), No.2, pp. 305-316, 2002
Lee, H. W. and Park, Y. S., 'Distribution Characteristics of Residual Compressive Stresses Induced by Shot-peening in the Aircraft Structural Material,' J. Korean Soc. Precision Eng., Vol. 21, No. 5, pp. 149-157,2004