Thermomechanical Modelling of Refractory Mortarless Masonry Wall Subjected

Thermomechanical Modelling of Refractory Mortarless Masonry Wall Subjected to Biaxial Compression Mahmoud Ali *, Thomas Sayet, Alain Gasser, Eric Blond Univ. Orléans, Univ. Tours, INSA-CVL, La. Mé (EA 7494), Orléans, France UNITECR 2019, 13 th -16 th October, Yokohama, Japan.

Introduction Methodology Results Conclusion Steel ladle Section view Mortarless Masonry structure Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan 2

Introduction Methodology Isotropic - oversimplified approach Micro/Macro approach Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan Results Conclusion Detailed approach Very high computation time EHM 3

Introduction Methodology Results Conclusion Possible Joint Patterns Joint Pattern Bed Joints Head Joints 1 open 2 open closed 3 closed open 4 closed Pattern 1 Pattern 2 Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan Pattern 3 Pattern 4 4

Introduction Methodology Results Conclusion Effective mechanical properties Pattern 1 Pattern 2 Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan Pattern 3 Pattern 4 5

Introduction Results Methodology Conclusion Effective mechanical properties of joint pattern 3 Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan 6

Introduction Methodology Results Conclusion Joints closure Criteria Joints reopening Criteria - Bed joints reopen if - Head joints reopen if In cyclic operation, joints will close and reopen leading to a change from one joint pattern to another Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan 7

Methodology Introduction Testing the developed constitutive model Pattern 1 Results Uniaxial loading/unloading in X-direction Conclusion Pattern 2 Gradual closure of bed joints and, therefore, changing from joint pattern 1 to joint pattern 2 Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan 8

Introduction Methodology Results Conclusion Uniaxial loading/unloading in Y-direction Pattern 1 Pattern 3 Gradual closure of head joints and, therefore, changing from joint pattern 1 to joint pattern 3 Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan 9

Introduction Methodology Results Conclusion Biaxial compression test After preloading Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan 10

Introduction Methodology Results Conclusion Pattern Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan 11

Introduction Methodology Results Conclusion Pattern Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan 12

Introduction Methodology Results Conclusion and future work • • • 3 D numerical models have been developed to analyze the impact of joints closure/reopening on the mechanical behavior of mortarless masonry structures. Four joint patterns, joints closure/reopening criteria have been defined. The overall behavior of the mortarless masonry structure is orthotropic and nonlinear due to gradual closure of joints and changing from one joint pattern to another. Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan 13

Introduction Results Methodology Conclusion Future work We are now extending the developed models to account for the viscoplastic effects at high temperature (creep and stress relaxation). Uy Pattern Linear elastic Mahmoud ALI, Univ, Orléans, UNITECR 2019, 13 th -16 th October, Yokohama, Japan 14

Advanced THermomechanical multiscale m. Odelling of Refractory linings Thank you for your attention! mahmoud. ali@univ-orleans. fr Acknowledgments: this work was supported by the funding scheme of the European Commission, Marie Skłodowska-Curie Actions Innovative Training Networks in the frame of the project ATHOR - Advanced THermomechanical www. etn-athor. eu multiscale modelling of Refractory linings 764987 Grant.