...Joseph G. Kurebwa; Anastasia Vasileiou; Matthew J. Roy; Mike C. Smith Purpose The present study is aimed at developing a computationally efficient residual stress modelling method that is suitable for arc directed energy deposition (Arc-DED) additive manufacturing applications using macroscopic...

...Mohammad Zaman Kabir; Mehdi Parvizi Purpose The purpose of this paper is to focus on the influences of residual stresses which were induced during roll-forming sections on lateral-torsional buckling of thin-walled cold-formed steel channel and built-up I-sections beams. Built-up I section is made...

... on a weld toe. Design/methodology/approach Residual stress and hardness distribution were measured. Microstructures around the weld toe were observed to clarify the cause for the change in hardness after NP. Finite element method analysis was used to analyze the change in the stress concentration...

... surface roughness, sub-surface hardness, residual stresses and surface morphology, was investigated in detail, and the surface quality of samples ground by two grinding wheels was compared. Design/methodology/approach In the present work, surface integrity of quenched steel 1045 machined by the CBN...

... residual stress; an increasing trend was observed for concave models and a decreasing trend was observed for convex models. The consistency in the analytical formulation with the simulation model indicates the behavior of laser peening for curved geometries. Originality/value – The differences...

... of a peened specimen originated outside the slit, which indicated that peening eliminated the effect of the slit on the fatigue limit. Third, the fatigue limit of a slit specimen was improved by the enhanced residual stress distribution and the decreased stress concentration due to plastic deformation...

... Takahashi can be contacted at: ktaka@ynu.ac.jp © Emerald Group Publishing Limited 2014 Fatigue limit Residual stress High-strength steel Shot peening Stress ratio Surface defect High structural integrity is required in mechanical parts. However, the structural integrity...

...Prof P.M.S.T De Castro; Dirk Schnubel; Manfred Horstmann; Norbert Huber Purpose – While normally the formation of thermally induced residual stresses is seen mainly as detrimental side effect from production processes like welding or casting, the well-directed introduction of thermal residual...

... at the specimen surface, and 0.496 mmA arc height. Residual stress measurement was carried out using the X‐ray diffraction method with a Cr‐Kα beam X‐ray spectrum and a 2.0‐mm X‐ray beam injection diameter. It was difficult to measure the residual stress near the artificial surface defect...

... to a variable amplitude loading. Design/methodology/approach To optimally design an LP process, an experimentally validated 3D finite element simulation of the LP process, a cycles‐to‐failure estimation capability incorporating residual stress, and a particle swarm optimization strategy were developed...

... to the LP parameters. This approach directly relates the LP parameters with the fatigue life instead of the residual stress profile characteristics. The findings of the research implied that selecting the objective to be the cycles‐to‐failure is a better option as compared to the residual stress profile...

..., and a computer for controlling the timing for applying the coatings and the laser pulse for each spot. Figure 3 shows how the automated sequence works through a series of still photos. © Emerald Group Publishing Limited 2011 Lasers Peening Residual stress Automation Overlay Surface...

... of the semi‐circular slit (0.1‐0.3 mm). Koji Takahashi can be contacted at: ktaka@ynu.ac.jp © Emerald Group Publishing Limited 2011 Shot peening Fatigue strength High‐strength steel Crack‐like surface defect Residual stress Fracture mechanics Fatigue Steel Deformation Lighter...

...Yoshihiro Sakino; Yuji Sano; You‐Chul Kim Purpose Laser peening without coating (LPwC) is an innovative surface enhancement technology for introducing compressive residual stress in metallic materials. The purpose of this study is to examine the characteristic at the laser‐peened welded zone...