PSI - Issue 42

T. Vandellos et al. / Procedia Structural Integrity 42 (2022) 50–57 C2 - Restricted Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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4

Fig. 4. Illustration of the mesh size

For both metallic and bond materials, an elastic behavior was defined. The elastic mechanical properties are listed in Table 1.

Table 1. Material properties for the metallic rollers and the bond Materials Young Modulus ( MPa )

Poisson ratio

Metal Bond

200000 50000

0.3 0.3

To understand the behavior of the joint during the test, three models were proposed: • The first model with an elastic cohesive zone model for the interface ( i.e. without damage criterion) and an elastic behavior for the CMC substrates. • The second model with an elastic cohesive zone model for the interface and a continuum damage model for the substrates. This damage model, named ODM-OxOx (for ONERA Damage Model for CMC oxide/oxide material), is able to predict the matrix damage and the yarn failure of the CMC material. The damage model was associated with the zones of interest, indicated in yellow with diagonal lines and orange with vertical lines on the Fig. 5. Furthermore, due to the symmetrical geometry of the model, the yarn failure was only taken into account on the left side ( i.e. orange with vertical lines) for making possible the comparison with the experimental observations. Somewhere else, an elastic behavior was used in the grey zone with horizontal lines in order to simplify the contact resolution between the rollers and the CMC substrate. • The last model with ODM-OxOx for the substrates and a damage cohesive zone model for the interface.

Fig. 5. Material properties associated with different zones of the model