Numerical modelling of three-dimensional fatigue crack closure: Plastic wake simulation.

• Finite element method has been broadly used to study fatigue crack closure. • One critical parameter is the plastic wake length necessary to converge the solution. • Conclusion present recommendations about minimum plastic wake length. • The influence is greater in stress and strain fields results that in crack opening and closure results. Finite element method has been broadly used to study fatigue crack closure. The simulated plastic wake length is one of the key modelling parameters involved. This paper presents a complete analysis in fatigue crack closure 3-D models. It is aimed at two aspects: the influence on the calculation of opening and closure values, and the effect on other main results. Conclusion indicates a 0.6 times Dugdale's plastic size length to stabilise results as plastic zone or contact area, but a reduced length could be acceptable in terms of crack closure results. This suggests some independence among this parameter and fatigue crack closure. [ABSTRACT FROM AUTHOR]