RESIDUAL STRESS ANALYSIS BY CONTOUR METHOD ONTO COLD EXPANDED HOLE ASSEMBLY– COMPARISON WITH FEA

Author:  Vincent DELAGE 1, Jean-Michel DUCHAZEAUBENEIX 1, Laurence BESNAULT 1 1 Meliad, www.Meliad-sas.com, 6, rue des Orfèvres 44840 Les Sorinières, France [email protected], [email protected], l.besnault@Meliadsas. com
Source:  ICSP14 Milan
Doc ID:  2022102
Year of Publication:  2022
Abstract:  
1 Abstract Introducing high residual stress in a hole is critical for many fatigue life components, especially in aerospace industry. The process introduces deep residual stress on hole surface providing fatigue life enhancement. Cold expansion should be controlled to guaranty both the homogeneity and the repeatability of the compressive stresses generated by the process. However, it is difficult to control the stresses generated into the component with usual residual stresses measurement methods. This is why Meliad and Capaero with Mat-In-Meca developed the contour method allowing to control the deep stress profile generated in the part. This study shows how experimental measurement by the contour method and numerical model through finite element analysis gives effective characterization of the residual stresses introduced after hole expansion. Material: 35NCD13 Steel