PSI - Issue 60

Keshav Mohta et al. / Procedia Structural Integrity 60 (2024) 402–410 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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- Bundle geometry - Material properties - Boundary conditions

Turbulence and flow pulsation

CFD Analysis

FE model of fuel bundle

Hydrodynamic loads

Dead weight

Benchmarking with shake table sine sweep test

Transient dynamic FE analysis of fuel bundle- PT assembly - Geometric and contact non linearity considered

Evaluation of contact force and sliding distance time history at bearing pad- pressure tube contact locations

Fig. 2. Procedure for evaluation of contact force and sliding distance time histories

Transient dynamic FE analysis - Contact force time histories - Sliding distance time histories

1. Select a bearing pad 2. Read following from FEA results for each element of bearing pad for two consecutive time instants: - Contact force - Sliding in axial direction (average of nodal values) - Sliding in circumferential direction (average of nodal values) 3. For the considered time increment between the two selected time points, evaluate following for each element of bearing pad: - Average of the contact force of selected time instants - Incremental sliding distance by vector addition of incremental sliding distance components in axial and circumferential directions - Incremental normal work as the product of the above two

4. The incremental normal work of bearing pad is obtained by linear summation of incremental normal work from each element of bearing pad.

5. The cumulative normal work of bearing pad is evaluated by linear summation of incremental normal work from the each such small-time increment of analysis time.

6. The average normal work rate is evaluated by dividing the cumulative normal work by total analysis time.

Fig. 3. Computations to evaluate normal work rate from FE results