A Multi-Physics Approach to Validation of Failure Models in Extreme Thermoacoustic Environments
Abstract
This report describes the research performed over the course of a 46-month programme funded by the European Office of the United States Air Force (EOARD). The long-term goal of this work is the understanding and modelling of the coupled thermoacoustic fatigue failure of aircraft structures and developing a validation framework for the complex high-end numerical models, which would lead to the eventual success of a digital twin concept. The research has been conducted under the supervision of Professor Eann Patterson and has been conducted by Ana Catarina dos Santos Silva, Elias Lopez Alba and Khurram Amjad. The work by Ana Catarina dos Santos Silva has been focused on the concurrent acquisition of full-field displacement and temperature data from aerospace-grade material plates subject to thermal and thermo-mechanical loading. A robust finite element (FE) model was also developed capable of predicting resonant frequencies and mode shapes for a plate under coupled non-uniform thermal and acoustic loading using temperature-dependent material properties and a realistic geometric representation of the initial curvature of the plate. Two-dimensional orthogonal decomposition was employed for compression of the full-field experimental data and validation of the FE model. Finally, the influence of non-uniform temperature distribution on the deformation of plates was further investigated using a 1mm plate with reinforced edges. The geometry was designed to emulate an aircraft's skin with the reinforced edges performing the function of stringers and ribs. Full-field deflection results for the reinforced plate showed it to behave as a dynamic system that buckles out-of-plane when heated before relaxing to a steady state. It was demonstrated that the out-of-plane displacement experienced by the plate is strongly influenced by the in-plane spatial distribution of temperature.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 03, 2020
- Accession Number
- AD1106326
Entities
People
- Ana Silva
- C. M. Sebastian
- Eann A. Patterson
- Khurram Amjad
- Lopez-alba Elias
Organizations
- University of Liverpool