%0 Journal Article %T Thermometric investigations for the characterization of fatigue crack initiation and propagation in Wire and Arc Additively Manufactured parts with as‐built surfaces %+ Institut de Recherche Dupuy de Lôme (IRDL) %+ Naval Group Research [Bouguenais] %A Bercelli, Lorenzo %A Doudard, Cédric %A Calloch, S. %A Le Saux, V. %A Beaudet, Julien %< avec comité de lecture %@ 8756-758X %J Fatigue and Fracture of Engineering Materials and Structures %I Wiley-Blackwell %V 46 %N 1 %P 153-170 %8 2023-01 %D 2023 %R 10.1111/ffe.13854 %K Additives %K Fatigue crack propagation %K High-cycle fatigue %K Stress analysis %K Surface roughness %K Thermoelasticity %K Wire %Z Engineering Sciences [physics]/Mechanics [physics.med-ph]Journal articles %X Metal Additive Manufacturing (AM) allows for the fabrication of complex shapes with high added value at low costs. Indeed, as-built structures are near net shape: they require few to no finishing operations. However, as-built AM parts present significant roughness caused by the layer discretization. In the case of the Wire and Arc Additive Manufacturing (WAAM) process, used for large-scale structures, the as-built roughness is estimated to several hundreds of micrometers. For complex geometries, a complete machining of the surfaces is not necessarily possible. In this study, an experimental method is proposed, relying on thermoelastic stress analysis, to characterize the effect of as-built WAAM surface roughness on high-cycle fatigue properties. Using an infrared camera, multiple cracks can be detected and monitored over a large surface on rough WAAM samples under cyclic bending. The collected data constitutes valuable information for the identification of a fatigue model dedicated to as-built WAAM structures. %G English %2 https://ensta-bretagne.hal.science/hal-03826772/document %2 https://ensta-bretagne.hal.science/hal-03826772/file/Thermometric%20investigations%20for%20the%20characterization%20of%20fatigue%20crack%20initiation%20and%20propagation%20in%20Wire%20and%20Arc%20Additively%20Manufactured%20parts%20with%20as-built%20surfaces%20-%20preprint.pdf %L hal-03826772 %U https://ensta-bretagne.hal.science/hal-03826772 %~ UNIV-BREST %~ ENSTA-BRETAGNE %~ CNRS %~ UNIV-UBS %~ UBS %~ ENIB %~ IRDL %~ ENSTA-BRETAGNE-MECA %~ ENSTA-BRETAGNE-PTR5-IRDL