Computational homogenization of elastic-viscoplastic refractory masonry with dry joints

Ali, Mahmoud; Sayet, Thomas; Gasser, Alain; Blond, Éric

doi:10.1016/j.ijmecsci.2021.106275

Cited by 16 publications

(6 citation statements)

References 55 publications

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“…2,15 The data obtained through experimental campaigns are used to calibrate such models with varying degrees of complexity from linear thermoelastic to more complex models, including viscoplasticity and damage. [29][30][31] However, the behavior obtained through such models for a steel ladle is not validated due to a lack of experimental investigations. Therefore, to validate numerical models, experimental work is required to be carried out on an assembly that represents a real structure.…”

Section: Introductionmentioning

confidence: 99%

Development and experimental characterization of the thermomechanical behavior of a scaled steel ladle

Gajjar,

Put,

Pereira

et al. 2024

Int J Applied Ceramic Tech

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A steel ladle usually employs mortarless refractory masonry in the innermost layer in direct contact with molten steel. The behavior of such masonry under high thermal loading is complex and essential for designing such installation. A large‐scale experimental campaign was carried out focusing on a simplified, laboratory‐scaled, pilot steel ladle built with multiple refractory linings as in an industrial ladle. Tests were performed under transient thermal loading up to 1400°C with new and used working linings. The results showed that the distribution of temperatures between the refractory linings was similar for all specimens and confirmed the importance of the selection of the refractory materials in the distinct linings of the ladle to limit heat losses. The heterogeneity in the distribution of dry joints and the effect of the dry joint thickness were also measured using strain gauges. The measurements indicate the effect of viscoplasticity in the working lining on the steel shell, which shows a progressive reduction in the strain starting at 1200°C. The tests performed on the working linings show lower strain built‐up due to large viscoplastic deformation and increased joint thickness.

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Section: Introductionmentioning

confidence: 99%

Development and experimental characterization of the thermomechanical behavior of a scaled steel ladle

Gajjar,

Put,

Pereira

et al. 2024

Int J Applied Ceramic Tech

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“…The design and optimization of a steel ladle lining is a complex process because the thermal and thermomechanical performance of a lining is affected by several factors, such as process conditions [ 3–7 ] and lining configurations, [ 8–15 ] for instance, presence or absence of an insulation, lining thicknesses, material selection, and joints. Significant efforts have been devoted toward facilitating the design and optimization of steel ladle linings.…”

Section: Introductionmentioning

confidence: 99%

“…[1,2] Therefore, a well-designed steel ladle increases its lifetime, steel quality, and productivity, favors environment-friendly missions, and reduces energy consumption and refractory costs. [1,2] The design and optimization of a steel ladle lining is a complex process because the thermal and thermomechanical performance of a lining is affected by several factors, such as process conditions [3][4][5][6][7] and lining configurations, [8][9][10][11][12][13][14][15] for instance, presence or absence of an insulation, lining thicknesses, material selection, and joints. Significant efforts have been devoted toward facilitating the design and optimization of steel ladle linings.…”

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confidence: 99%

“…The application of a C-free working layer can reduce the tapping temperature by 16 °C and energy consumption by 20% because of the hindered heat transfer due to the lack of carbon and the presence of lower thermal conductivity phases, for instance, microporous phases. [11] Homogenized numerical models were developed by Ali et al [12,13] to simulate the transient thermomechanical behavior during a typical steel-ladle thermal cycle. The working lining and bottom of the ladle were replaced with an equivalent material model that considered the presence of dry joints and their closure and reopening under cyclic thermal or mechanical loading/unloading.…”

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confidence: 99%

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Multi‐Response Optimization of the Thermal and Thermomechanical Behavior of a Steel Ladle Lining using Grey Relational Analysis and Technique for Order Preference by Similarity to Ideal Solution

Hou

Gruber

Jin

2022

steel research int.

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The present research attempts to simultaneously optimize the thermal and thermomechanical behavior of a steel ladle lining. The lining configurations are designed with an L32 orthogonal array considering the input parameters of various material properties and lining thicknesses. From the finite‐element (FE) simulations, three responses are evaluated: the end temperature and maximum tensile stress at the steel shell and the maximum compressive stress at the hot face of the working lining. Multi‐response optimization is performed through grey relational analysis (GRA) and the technique for order preference by similarity to ideal solution (TOPSIS) by applying a distinguishing coefficient of 0.5 in GRA and the signal‐to‐noise (S/N) ratio‐based weight in both techniques. Both GRA and TOPSIS results yield the same best solution (the fourth lining configuration) and the same optimal levels for significant factors. Analysis of variance (ANOVA) is used to identify the significance of the factors and their contributions to the overall performance characteristic. The results demonstrate that the top five factors with the analyses of GRA and TOPSIS are the same and their total contribution is similar.

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“…To circumvent such a difficulty, meta-heuristic algorithms are resorted to for the solution of the nonlinear optimization problem, in combination with a NURBS discretization technique [37]. In the latter respect, a major difference can be highlighted compared to the so-called block-based methods, that have been broadly used for the limit analysis of both 2D and 3D masonry structures (e.g., see [38][39][40][41][42][43][44][45][46][47]). In fact, in block-based methods cracks can only open at the interfaces between the pre-determined blocks, whence a simpler optimization problem is formulated.…”

Section: Introductionmentioning

confidence: 99%

Collapse capacity of masonry domes under horizontal loads: A static limit analysis approach

Nodargi¹,

Bisegna²

2021

Preprint

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A static limit analysis approach is proposed for assessing the collapse capacity of axisymmetric masonry domes subject to horizontal forces. The problem formulation is based on the sound theoretical framework provided by the classical statics of shells. After introducing the shell stress tensors on the dome mid-surface, integral equilibrium equations are enforced for its typical part. Heyman's assumptions of infinite compressive and vanishing tensile strengths are made, with cohesionless friction behavior governing the shear strength, to characterize the admissible stress states in the dome. An original computational strategy is developed to address the resulting static limit analysis problem, involving the introduction of a mesh on the dome mid-surface, the interpolation of the physical components of the shell stress tensors on the element boundaries, and the imposition of equilibrium and admissibility conditions respectively for the elements and at the nodes of the mesh. The descending discrete convex optimization problem is solved by standard and effective optimization tools, automatically providing collapse multiplier of horizontal forces, incipient collapse mechanism and expected crack pattern. Convergence analysis, validation with experimental results available in the literature, and parametric analyses with respect to geometric parameters and friction coefficient, are presented for spherical and ellipsoidal masonry domes, proving the reliability of the proposed approach for estimating the pseudo-static seismic resistance of masonry domes.

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Computational homogenization of elastic-viscoplastic refractory masonry with dry joints

Cited by 16 publications

References 55 publications

Development and experimental characterization of the thermomechanical behavior of a scaled steel ladle

Development and experimental characterization of the thermomechanical behavior of a scaled steel ladle

Multi‐Response Optimization of the Thermal and Thermomechanical Behavior of a Steel Ladle Lining using Grey Relational Analysis and Technique for Order Preference by Similarity to Ideal Solution

Collapse capacity of masonry domes under horizontal loads: A static limit analysis approach

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