A method to generate conformal finite-element meshes from 3D measurements of microstructurally small fatigue-crack propagation
| Autor: | A. R. Cerrone, Robert M. Suter, S. F. Li, Anthony R. Ingraffea, Jonathan Lind, Ashley D. Spear, Jacob D. Hochhalter |
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| Rok vydání: | 2016 |
| Předmět: |
Diffraction
Materials science Computer simulation Mechanical Engineering Constitutive equation Conformal map 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Finite element method 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Microscopy General Materials Science Polygon mesh 0210 nano-technology Simulation Volume (compression) |
| Zdroj: | Fatigue & Fracture of Engineering Materials & Structures. 39:737-751 |
| ISSN: | 8756-758X |
| DOI: | 10.1111/ffe.12449 |
| Popis: | In an effort to reproduce computationally the observed evolution of microstructurally small fatigue cracks (MSFCs), a method is presented for generating conformal, finite-element (FE), volume meshes from 3D measurements of MSFC propagation. The resulting volume meshes contain traction-free surfaces that conform to incrementally measured 3D crack shapes. Grain morphologies measured using near-field high-energy X-ray diffraction microscopy are also represented within the FE volume meshes. Proof-of-concept simulations are performed to demonstrate the utility of the mesh-generation method. The proof-of-concept simulations employ a crystal-plasticity constitutive model and are performed using the conformal FE meshes corresponding to successive crack-growth increments. Although the simulations for each crack increment are currently independent of one another, they need not be, and transfer of material-state information among successive crack-increment meshes is discussed. The mesh-generation method was developed using post-mortem measurements, yet it is general enough that it can be applied to in-situ measurements of 3D MSFC propagation. |
| Databáze: | OpenAIRE |
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