ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Microscopic and macroscopic deformation of a polycrystal due to an applied load can bemodelled using crystal plasticity implemented within the Finite Element (FE) framework. However,while macroscopic predictions can readily be validated against conventional monotonic and cyclicstress-strain curves, verification at the microscopic level is harder to achieve, since it involvescalibrating the predictions for stresses and strains in individual grains, or in grains grouped bycertain criteria (e.g., orientation).In this paper an elasto-plastic polycrystal finite element model is introduced, and its calibration isperformed at a mesoscopic level via comparison with neutron diffraction data obtainedexperimentally. Time-of-flight (TOF) neutron diffraction experiments carried out on ENGIN-Xinstrument at ISIS involved in situ loading of samples of C263 nickel-based superalloy. In order tocompare the numerical predictions of the FE model with these experimental data, the correspondingmesoscale average elastic strains must be extracted from the results of the simulation by employinga ‘diffraction post-processor’. This provides a much improved technique for the calibration of FEformulation and enhances the confidence in the model. The FE diffraction post-processingprocedures are discussed in detail, and comparison between the model predictions and experimentaldata are presented
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.427.pdf
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