Fatigue and Fracture Behaviour of Welded and Other Additive Manufactured Structures (Volume II)

Dear Colleagues,

Filler material used in welding should be the same class as base material, but welding codex often uses a filler with higher yield strength than the base material to shift eventual plastic deformation to the base metal, or with lower yield strength if cracking of the weld metal becomes inevitable. Welded joints are also often the location of potential flaws, where flaw assessment assumes homogeneous material properties, but welds are heterogeneous. There is a compendium of yield load solutions for strength mismatched fracture mechanics specimens developed to address the heterogeneity in the weld joint. However, solutions for the yield load at different combinations of the strength mismatch within the weld are missing, where mechanical testing and finite element simulations are necessary. In addition, the additive manufacturing materials can be made by advanced welding technology (by wire) or by powder laser additive technology. In both cases, residual stresses play important roles with respect to the geometry of the component and fatigue and fracture behaviour of the material. It is also an efficient tool to take into account residual stresses, which can strongly affect the stress distribution around the flaws in the heterogeneous weldments. In addition to more conventional approaches, the multi-scale methodology is computationally efficient and provides a possible means to bridge multiple-length scales (from 10 nm in MD simulation to 10 mm in FE model). This could be a useful tool in considering an acceptable level of accuracy with respect to yield load in heterogeneous welds. In this Special Issue, relevant contributions with respect to the aforementioned topics, as well as other additive manufactured structures, will all be considered.

Therefore, in this Special Issue, modern trends of testing and simulating heterogeneous welded and other additive manufactured components, including the multi-scale approach, resulting in appropriate flaw assessment procedures, are highlighted and discussed.

It is my pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome.

Prof. Dr. Dražan Kozak
Prof. Dr. Nenad Gubeljak
Prof. Dr. Aleksandar Sedmak
Guest Editors

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