Numerical simulation of cold working of rivet holes

• Published in: Finite elements in analysis and design Vol. 41; no. 9; pp. 989 - 1007
• Main Authors: de Matos, P.F.P., Moreira, P.M.G.P., Camanho, P.P., de Castro, P.M.S.T.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.05.2005; Elsevier
• Subjects: Cold working; Computer simulation; Contact; Exact sciences and technology; Finite element method; Finite elements; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); Mathematical analysis; Mathematical models; Nonlinearity; Physics; Residual stress; Solid mechanics; Structural and continuum mechanics; Two dimensional; Finite elements; Cold working; Residual stress; Fatigue life; Cold process; Stress analysis; Hole; Work hardening; Non linear material; Sleeve; Fastener; Modeling; Axial symmetry; Geometrical model; Plate; Finite element method; Riveted joint; Rivet; Aircraft
• ISSN: 0168-874X; 1872-6925
• DOI: 10.1016/j.finel.2005.01.001

The cold working process is a well-known technique used to improve the fatigue life in aircraft structures. It has been shown that the only way to accurately simulate the cold working process using finite elements is modelling the plate, mandrel and sleeve. Usually, two-dimensional, two-dimensional axisymmetrical and three-dimensional models are used to predict the resulting residual stress field. This type of problem requires complex calculations and is time consuming since it involves the use of contact between the elements assembled and non-linear geometric and material models to simulate the behaviour of the plate. In engineering problems, simpler analyses are preferable as long as the errors caused by the simplifications can be quantified. This paper presents and compares the results obtained using models with different levels of complexity. The consequences of using some of the normal approximations concerning to the geometry, boundary conditions and type of model used, are evaluated.