29 Non-unique Estimates in Material Parameter Identification of Nonlinear. . . 263 Fig. 29.4 Time history of normalized posterior estimates of all eleven time-invariant material parameters Fig. 29.5 Evolution of RRMS error for all sensors during filtering true response time histories was also observed for non-measured response quantities. To illustrate this, the predicted response history (using the posterior mean estimate of the material parameters at the last time step, tk =20s) and the corresponding true response time history are shown in Fig. 29.6 for the first invariant of the stress tensor (I1) and the Frobenius norm of the deviatoric stress tensor, respectively, at an integration point close to the heel of the dam (see Fig. 29.3a).
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