Publicado 6 números por año
ISSN Imprimir: 1543-1649
ISSN En Línea: 1940-4352
Indexed in
A MULTISCALE APPROACH FOR THERMO-MECHANICAL SIMULATIONS OF LOADING COURSES IN CAST IRON BRAKE DISCS
SINOPSIS
This article presents a multiscale approach for the simulation of coupled heat and stress evolution induced by different loading courses in gray cast iron brake discs. The concept integrates the microstructural properties as homogenized material laws into the macroscopic computations. Extensive experimental testing is required to establish a complete set of material parameters needed to conduct thermo-mechanical simulations on a macroscopic length scale. In addition, the microstructure can vary within the disc due to differences in wall thicknesses and cooling rates. In order to reduce the experimental effort and to estimate the influence of microstructure characteristics on macroscopic heat and stress distributions, simulations on the mesoscopic scale resolving the heterogeneous microstructure with graphite flakes in a pearlite matrix are conducted. The workflow to derive the elasto-plastic properties according to its microstructure is demonstrated for a typical cast iron material. Geometrical parameters of the graphite phase distributions and shape factors composed from micrographic analysis are used to generate representative volume elements (RVE) and to define the metallographic constituents. The information serves as input parameters to algorithmically construct a 3D cast iron microstructure. The elastic and elasto-plastic material models of the constituents are briefly elucidated. In order to simulate the different material behavior in tension and compression, a crack opening and crack closure mechanism is included. The potential of complementing and substituting experimental testing is shown by a quantitative comparison of the simulation results with experimental data at ambient temperature. Both virtual tension and compression tests are executed as well as a tension-compression cycle and the determination of the yield surface of the material. The presented approach provides a first step into a versatile range of applications and illustrates a broad potential for future challenges of multiscale modeling in the field of thermo-mechanical failure analysis.
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Schneider Daniel, Schoof Ephraim, Huang Yunfei, Selzer Michael, Nestler Britta, Phase-field modeling of crack propagation in multiphase systems, Computer Methods in Applied Mechanics and Engineering, 312, 2016. Crossref
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Herrmann Christoph, Schmid Stefan, Schneider Daniel, Selzer Michael, Nestler Britta, Computational Determination of Macroscopic Mechanical and Thermal Material Properties for Different Morphological Variants of Cast Iron, Metals, 11, 10, 2021. Crossref