Project description
Small deformations create big problems for structural parts
Large structural components in aeronautical engines and power plant applications withstand tremendous loads and severe temperatures day in day out. These obvious threats can create insidious and invisible microscopic subsurface deformations that eventually lead to the demise of such components, with serious consequences. Oxidation can accelerate subsurface deformation, which in turn increases surface reactivity, creating a dangerous cycle of destruction. The EU-funded HT-S4DefOx project is developing experimental techniques and simulations to better characterise the thermal, mechanical and chemical interactions that modulate the evolution of subsurface deformations. Enhanced knowledge of material behaviour should lead to improved designs and monitoring technologies as well as earlier interventions to extend the lifetime of critical structural components.
Objective
Structural materials exposed at high temperatures (650°C-1200°C) and severe loads are prone to both local oxidation-assisted deformation and deformation-assisted surface reactivity. Material evolutions within the sub-surface region affected by oxidation (0.1 to 100 µm deep gradient) generally drive premature damage and the unexpected ruin of bulky structural components. Therefore, assessing the evolutions of the local deformation at the sub-grain scale at high temperature using micro- and mesomechanical approaches is the key point to clarify thermo-mechano-chemical interactions favouring early damage. HT-S4DefOx aims to tackle such small-scale and pluridisciplinary investigations on Ni-based and Ti-based model materials. Advanced high temperature micromechanical techniques (high resolution-digital image correlation (HR-DIC), in-situ TEM mechanical testing, in-situ micropillar/nanoindentation testing, synchrotron nano-tomography and topotomography) will be purposely coupled with numerical simulations (phase field-coupled crystal plasticity finite element methods). My unique expertise in mesoscale ultrathin specimen preparation and testing allows the present experimental investigation of the coupling between surface reactivity and local deformations. The development of novel mesoscale flexural techniques with real-time 3D observation of the specimen deformation up to 1000°C will finally bridge the gap between micro- and macroscale mechanical characterisations, with an emphasis on graded properties materials. Investigating sub-surface behaviour during oxidation lies in the inability to achieve robust measurement at such hidden location. In addition, the surface texture evolution while oxide growth constitutes another significant obstacle. Therefore, smart surface monitoring for high temperature HR-DIC at the microscale and inverse numerical methods will give unique and quantitative information on the local mechanical behaviour of such “invisible” materials.
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Funding Scheme
ERC-STG - Starting GrantHost institution
75794 Paris
France