First Year Assessment of Juan Luis de Pablos , entitled “Formulation, implementation and statistical analysis of material models for metals subjected to high strain rates and high temperature” – 26th of September, in the Auditorium at 12:00 pm


The commercial aviation industry is a field of innovation and vanguard technology application, in which competitiveness is a critical need. As a consequence, new materials and techniques take place continuously with the purpose of creating a significant advantage in relation to other market contenders.

One of the sector key issues focusing the development efforts in the area is the turbofan engines performance, comprising improvement aspects like noise reduction, cutting CO2 polluting emissions and fuel economy efficiency.

Considering the above, the project in which this report is framed within, known as HIPped Ultrafan Casing (HUC), is aimed at the improvement of the fabrication Buy to Fly ratio of the new Ultrafan turbine engine casing, while bearing in mind other critical requirements as the containment capacity of the mentioned part. The latter will have to be widely tested beforehand through the use of numerical simulations, taking into account additional challenges as the use of new materials, the higher pressure and temperatures that the component will have to withstand due to the more demanding operating conditions, and the unlikely but possible event of blade detachment.

This report describes the set-up of a framework for the implementation of a selection of constitutive material models in order to reproduce the behavior of metals subjected to conditions of high strain, high strain rates and temperature, as those expected in the interior of a turbine engine casing.

Additionally, with the objective of correctly and efficiently calibrate these models, a complex statistical approach has been developed including a rst parameter screening phase, with the use of sensitivity analysis methods, carrying out then a second step procedure based on Bayesian calibration.

Finally, the validation of the diferent material models is presented, together with the application of the two-phased statistical procedure to them, delivering promising results in both cases, not only with regard to the scope intended in the project framework, but also on a wider sphere of application.