Integrated Computational Materials Engineering (ICME) by Unknown

Integrated Computational Materials Engineering (ICME) by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9783030405625
Publisher: Springer International Publishing


The local calibration method requires that the mechanical test be paused periodically to acquire and process HREBSD and compute local stress at various microstructure locations; see Fig. 7. At the same time, DIC data is acquired to provide local strain data. The DIC data is used as input to the CP model, where each local strain tensor is used to drive deformation. The CP model is then used to compute stress at each coincident point. Those computed stress values are compared directly with the local stress values acquired by HREBSD. In this process, the CP model must be constrained to follow the same local strain and strain rate as the test. This way, there is no discrepancy in the history between acquired and computed data. Lastly, because acquiring HREBSD data is relatively time-consuming, it is practical to repeat this measurement only several times during loading. The increment in time between these measurements will likely be large relative to the numerical integration time stepping required by the CP model. However, the CP model need not increment in one step to times where DIC data was acquired, but may instead subdivide that increment into sufficiently small time steps to achieve convergence.

Fig. 7Example of a local calibration based on a direct use of a CP model



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