Characterization of random stress fields obtained from polycrystalline aggregate calculations using multi-scale stochastic finite elements
Sudret, Bruno ; Dang, Hung ; Berveiller, Marc ; Zeghadi, Asmahana ; Yalamas, Thierry
In: Frontiers of Structural and Civil Engineering, 2015, vol. 9, no. 2, p. 121-140
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- The spatial variability of stress fields resulting from polycrystalline aggregate calculations involving random grain geometry and crystal orientations is investigated. A periodogram-based method is proposed to identify the properties of homogeneous Gaussian random fields (power spectral density and related covariance structure). Based on a set of finite element polycrystalline aggregate calculations the properties of the maximal principal stress field are identified. Two cases are considered, using either a fixed or random grain geometry. The stability of the method w.r.t the number of samples and the load level (up to 3.5% macroscopic deformation) is investigated.