3-d Axisymmetric Numerical Analysis And Experimental Study Of The Fastener Hole Coldworking Process

Abstract

Most theories developed for the determination of the residual stresses and strains near the edge of a coldworked hole have been based on two-dimensional analysis considerations. They do not reflect faithfully the actual situation because of the three-dimensional nature of the coldworking procedure. In the present work, the ABAQUS finite element computer program was used to simulate the three dimensional behaviour of a cold expanded fastener hole. The through thickness hole profile and the variation in residual stresses and strains on both lateral surfaces and in the centre of the plate are studied and compared with experimental measurements of the residual stresses on both surfaces together with the values obtained from theoretical models proposed in the literature. Since the present analysis takes into account the non-uniformity of the coldworking procedure through the thickness of the hole, the proposed model may effectively be used to study the effect of the coldworking parameters on the residual stress distribution and thereby on fatigue life.