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Skin Friction Drag Predictions for Fouling-control Coatings and Biofouling Roughness: A Computational Approach with RANS Model
Get PDFHybrid FRP-Concrete-Steel Double-Skin Solutions for Sustainable Offshore Wind Support Structures
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A Study on Improving Rotor Sail Performance through Flow Control of the Upper Deck Structure of a Ship
Get PDFNumerical Modelling of Pore Pressure Distribution inside a Rubble Mound Breakwater using OpenFOAM®
Get PDFNumerical Simulation of Wave-Body Interactions with the evolution of Focused Waves Using HOS-CFD coupling Method
Get PDFA Fully Coupled Mechano-Chemical Digital Model for Environment-Induced Damage and Damage Propagation
Get PDFIt is vital to enable and establish both comprehension and simulation of environment-induced damage processes for predicting the remaining service life of engineering structures and components, conducting reliability analysis, and designing to enhance the material’s overall resistance to such damage. A fully coupled mechano-chemical peridynamic (PD) model for environment-induced degradation, including corrosion, was developed based on both peridynamic corrosion theory and the mechano-chemical effect theory. When the conditions for phase transition are satisfied, the movement of boundaries occurs autonomously, without requiring any supplementary boundary conditions to be specified within the model. This model effectively simulates degradation arising from the combined and interactive influences of mechano-chemical phenomena. To validate the model, in-situ electrochemical tests and stress corrosion cracking tests were conducted, with the results used to explore the effects of stress and/or load on the kinetics of environment-induced damage in an aluminum alloy. The experimental electrochemical parameter values closely match theoretical predictions, validating the mechano-chemical effects. As stress levels increase, the corrosion potential of aluminum alloy 7050 shifts negatively, corrosion current density increases, and the severity of corrosion worsens. The explicit finite difference method was employed to simulate the damage evolution of a typical stress corrosion crack in the aluminum alloy. This numerical model easily simulates the morphological evolution of corrosion pits with arbitrary shapes under different stress conditions during growth. The numerical predictions closely match the experimental findings. This innovative study demonstrates that the fully coupled mechano-chemical peridynamic corrosion model can accurately capture environment-induced damage and is a valuable tool for investigating the propagation and growth of such damage in aggressive environments.OPEN ACCESS Received: 24/07/2024 Accepted: 15/11/2024 Published: 20/04/202
Composite plate buckling. Best practices in Airbus Commercial
No full textDuring the last 20 years computational progress has significantly increased the capacity to determine the behavior of structures under complex loading conditions through finite element models analysis. This computational power can be used to build complex detailed finite element models but also to resolve more complex equations which were not possible to be coded before. Accurate buckling prediction is still a key factor on optimized structural designs. The accurate determination of the onset of buckling is absolutely essential to determine the initial point of instability and the subsequent post-buckling capability. Determining if the buckling will lead to immediate failure or the loading will be able to be redistributed afterwards is a major point to be considered. Designing a structural component with loading redistribution capability optimize the weight and increase the accuracy, so is a key objective of designers on structural components like torque boxes or fuselage skin. During years Airbus has been focused on developing accurate buckling predictions from close form solutions to complex energy methods development. This paper aims to summarize the evolution of such methods with special emphasis in energy methods and the best practices followed in Airbus for development. On top a summary of potential room for improvement and further evolution will be proposed