Finite element analysis of edge crack delamination and optimisation of functionally graded interlayer for coated stainless steel in hydrogen storage applications
| Autor: | Ian Davies, Sanam Abedini, Chensong Dong |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Thermal expansion Hydrogen storage chemistry.chemical_compound Coating Residual stress Materials Chemistry Silicon carbide Spallation Ceramic Composite material Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films chemistry visual_art visual_art.visual_art_medium engineering 0210 nano-technology Material properties |
| Zdroj: | Surface and Coatings Technology. 372:148-159 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2019.05.026 |
| Popis: | Whilst ceramic coatings have been widely used as thermal and diffusion barriers for metal components, significant challenges still exist for the manufacture and application of ceramic-metallic systems due to the difference in material properties. One of the basic and yet-unresolved challenges has been the presence of residual thermal stresses upon cooling from the manufacturing temperature which can lead to interfacial delamination and spallation of the coating as a result of differences in the coefficient of thermal expansion (CTE) between the metal substrate and ceramic coating. The move towards a hydrogen-based energy economy will increase these challenges due to the necessity to coat high pressure storage vessels with ceramic coatings in order to reduce losses from hydrogen diffusion. In this study, 316L stainless steel coated with silicon carbide (SiC) with and without a functionally graded (FG) 316L stainless steel/alumina (Al2O3) interlayer was investigated using finite element analysis (FEA) and consideration of energy change as a function of crack length. The main focus of the study concerned the improvement of interfacial delamination due to edge cracking which is an important failure mechanism in such systems. It was noted that applying a FG interlayer between the substrate and top coat was considerably beneficial in reducing thermal residual stresses in the system. The compositional gradient of the FG interlayer, known to be one of the main parameters that influences properties of functionally graded materials (FGMs), was then investigated and optimized by the energy variation method. The results revealed that an optimum composition gradient existed for minimisation of delamination and was found to be in good agreement with previous studies which mainly considered residual stresses and overall damage to the system. The energy variation method introduced was found to be a valid and useful tool for easier study of competitive failure mechanisms within a system and optimization of system parameters. |
| Databáze: | OpenAIRE |
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