The influence of constitutive material models on accumulated plastic strain in finite element weld analyses
TypeArticles dans des revues avec comité de lecture
Recent studies in computational weld mechanics have revealed the importance of the material plasticity model when predicting weld residual stresses. The present work seeks to extend this level of understanding to include the effects of the assumed material annealing behaviour, particularly when modelling multi-pass welds that comprise several thermo-mechanical loading cycles. A series of numerical analyses are performed to examine the variability in predicted residual stress profiles for different material models, using a validated finite element model for a three-pass slot weld in AISI 316LN austenitic steel. The material models consider both the work hardening and annealing assumptions for the chosen material. Model sensitivity is established not only from a weld residual stress perspective, but also from an assessment of the post-weld plastic strain accumulated in the weldment. Predictions are compared with indirect measurements acquired using cross-weld micro-hardness maps taken from benchmark specimens. Sensitivity studies reveal that the choice of annealing behaviour will have a significant impact on plastic flow predictions, which is dependent on the annealing temperature specified. Annealing assumptions will have a varying impact on the weld residual stress predictions, such that the extent of sensitivity is dependent on the plasticity model chosen. In contrast, the choice of plasticity model will have a significant effect on the predicted weld residual stresses, but relatively little effect on predictions of equivalent plastic strain.
Showing items related by title, author, creator and subject.
The influence of constitutive material models on accumulated plastic strain in finite element weld analyses MURÁNSKY, O; HAMELIN, C.J.; PATEL, V.I; LUZIN, V; BRAHAM, Chedly (ELSEVIER, 2015)Recent studies in computational weld mechanics have revealed the importance of the material plasticity model when predicting weld residual stresses. The present work seeks to extend this level of understanding to include ...
Assessment of low cycle fatigue improvement of machined AISI 316 stainless steel by brush hammering SIDHOM, Naziha; MAKHLOUF, Kamel; KHLIFI, Ammar; BRAHAM, Chedly; SIDHOM, Habib (Wiley, 2014)The effects of wire brush hammering on low cycle fatigue behaviour of AISI 316 austenitic stainless steel has been investigated on turned samples through an experimental study combining strain controlled fatigue tests, ...
Potential fatigue strength improvement of AA 5083-H111 notched parts by wire brush hammering: Experimental analysis and numerical simulation SIDHOM, Naziha; BEN MOUSSA, Naoufel; JANEB, Sameh; BRAHAM, Chedly; SIDHOM, Habib (ELSEVIER, 2014)The effects of milling as machining process and a post-machining treatment by wire-brush hammering, on the near surface layer characteristics of AA 5083-H111 were investigated. Surface texture, work-hardening and residual ...
Application of multireﬂection grazing incidence method for stress measurements in polished Al–Mg alloy and CrN coating MARCISZKO, Marianna; BACZMANSKI, Andrzej; WIERZBANOWSKI, K; WROBEL, Mirosław; BRAHAM, Chedly; CHOPART, J.-P.; LODINI, A; BONARSKI, J; TARKOWSKI, L.; ZAZI, N (Elsevier, 2012)Multi-reﬂection grazing incidence geometry, referred to as MGIXD, characterized by a small and constant incidence angle, was applied to measure low surface stresses in very thin layers of Al–Mg alloy and CrN coating. These ...
Effect of interlamellar spacing on the elastoplastic behavior of C70 pearlitic steel: Experimental results and self-consistent modeling YAHYAOUI, Houda; SIDHOM, H; BRAHAM, Chedly; BACZMANSKI, Andrzej (ELSEVIER, 2014)The effect of pearlite microstructure characteristics on strength and deformation of C70 pearlitic steel was investigated. Tensile tests under X-ray diffraction coupled with self-consistent model have been used to identify ...