PSI - Issue 42

Shahin Takht Firouzeh et al. / Procedia Structural Integrity 42 (2022) 1069–1073

1073

Shahin Takht Firouzeh / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 4. Scheme of the material parameter optimization algorithm and the comparison of the experimental BDT results to that of simulations.

Table 2. Identified cohesive parameters and fracture toughness values at 1200 ◦ C using the BDT.

K I c [MPa √ m]

Filter Material

E [MPa]

Γ 0 [N / mm]

t 0 [MPa]

Al 2 O 3 -C

7350 6200 4700

0.038 0.012 0.005

26.4

0.55 0.29 0.16

Al 2 O 3 -L-T-5:1 Al 2 O 3 -L-T-3:1

6.0 5.2

zone model was implemented to model crack growth, and to obtain the fracture toughness of the materials. Although good agreement to the results obtain by B3B is achieved, more validation studies and sensitivity analyses for the parameter optimization is needed. Despite the premises of the L-T bonded filter materials regarding environmental concerns, their mechanical properties require more improvement to match that of carbon-bonded filter material. To further develop the BDT model, an implementation of a phase-field model is foreseen to simulate also the formation of secondary cracks.

Acknowledgements

Authors would like to acknowledge the financial support of the German Research Foundation within the framework of Collaborative Research Center CRC 920. Help of Mr. Benjamin Bock and Dr. Xian Wu in providing the bulk filter materials and the help of Mr. Peter Große in specimen preparation is highly appreciated.

References

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