Phase field modelling of dynamic thermal fracture in the context of irradiation damage

Schlüter, Alexander; Kuhn, Charlotte; Müller, Ralf; Tomut, M.; Trautmann, C.; Weick, H.; Plate, Carolin

doi:10.1007/s00161-015-0456-z

Cited by 20 publications

(7 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A small parameter ζ ≪ 1 is introduced to maintain the well-posedness of the system for partially broken parts of the domain. The parameter ξ is used to describe two situations, ξ = 0 for the case when the heat flux is not affected by a crack, and ξ = 1 means that no heat will flow through cracks, or cracks are insulating [38]. The local thermal conductivity could be influenced by hydration process, as discussed in the previous works [4,39].…”

Section: Hydration Heatmentioning

confidence: 99%

Computational chemo-thermo-mechanical coupling phase-field model for complex fracture induced by early-age shrinkage and hydration heat in cement-based materials

Nguyen

Waldmann

Bui

2019

Computer Methods in Applied Mechanics and Engineering

View full text Add to dashboard Cite

In this paper, we present a new multi-physics computational framework that enables us to capture and investigate complex fracture behavior in cement-based materials at early-age. The present model consists of coupling the most important chemothermo-mechanical processes to describe temperature evolution, variation of hydration degree, and mechanical behavior. The changes of material properties are expressed as a function of the hydration degree, to capture the age effects. Fracture analysis of these processes is then accommodated by a versatile phase field model in the framework of smeared crack models, addressing the influence of cracks on hydration and thermal transfer. We additionally describe a stable and robust numerical algorithm, which aims to solve coupled problems by using a staggered scheme. The developed approach is applied to study the fracture phenomena for both homogeneous and heterogeneous concrete structures. Especially, in the second case, all microstructural heterogeneities of sand and cement matrix are explicitly accounted. Nucleation, initiation, and propagation of complex crack network are simulated in an efficient way demonstrating the potential of the proposed approach to assess the early-age defects in concrete structures and materials.

show abstract

Section: Hydration Heatmentioning

confidence: 99%

Computational chemo-thermo-mechanical coupling phase-field model for complex fracture induced by early-age shrinkage and hydration heat in cement-based materials

Nguyen

Waldmann

Bui

2019

Computer Methods in Applied Mechanics and Engineering

View full text Add to dashboard Cite

show abstract

“…Ductile fracture has already been investigated by Ambati and De Lorenzis [1], Kuhn and Noll [63] and Miehe et al [80]. On thermal fracture, Schlüter et al [102] presented qualitative results of dynamic thermal fracture in the context of irradiation damage.…”

Section: Extension Of the Implemented Phase Field Model For Dynamic Fmentioning

confidence: 99%

A phase field modeling of dynamic brittle fracture at finite strains

Omatuku¹

2019

Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications

View full text Add to dashboard Cite

declare that this thesis titled, "Phase Field Modeling of Dynamic Brittle Fracture at Finite Strains." and the work presented in this document are my own. I confirm that: • This work was done in candidature for a Master of Sciences degree in the field of Civil Engineering at the University of Cape Town. • I know the meaning of plagiarism and declare that all the work in the document, save for that which is properly acknowledged, is my own. • This thesis has been submitted to the Turnitin module (or equivalent similarity and originality checking software) and I confirm that my supervisor has seen my report and any concerns revealed by such have been resolved with my supervisor. • I have not allowed and will not allow anyone to copy this work with the intention of passing it as their own.

show abstract

“…For the sake of simplicity, the degradation function 𝜔(𝑑) is introduced in Equation (2.13), 59,66,73,74 with the implicit assumption that no heat will flow through fully softened cracks or, equivalently, the latter are insulating for heat conduction. 66,75,76 This simplification is acceptable since the opening of thermally induced cracks is usually very small such that the effects of convection and radiation can be neglected. More complex interactions between the cracking and thermal transfer processes need to be further studied in the future.…”

Section: Governing Equations For the Thermal Transfer Processmentioning

confidence: 99%

“…Regarding thermally induced cracking in solids, in all the existing studies, to the best knowledge of the authors, only the free thermal expansion was considered with both the TCS and the thermal degradation mechanism neglected. [57][58][59][60][61][62][63][64][65][66] Hence, such phase-field models do not apply to concrete at high temperatures, which involves fully coupled thermo-mechanical fracture.…”

Section: Introductionmentioning

confidence: 99%

A length scale insensitive phase‐field model for fully coupled thermo‐mechanical fracture in concrete at high temperatures

Chen

Zhou

2022

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Fracture in concrete at high temperatures involves complex thermo‐mechanical couplings and arbitrary crack evolution, imposing great challenges to its computational modeling. This work addresses a length scale insensitive phase‐field cohesive model for fully coupled thermo‐mechanical fracture in concrete at high temperatures. Both the thermal expansion and transient creep strain are accounted for in the kinematics. Based on the underlying phase‐field cohesive model for fracture in solids at ambient temperature, the temperature‐dependent mechanical properties of concrete, that is, Young's modulus, tensile and compressive strengths and fracture energy, and so forth, are all incorporated. In addition to the cracking‐induced mechanical damage mechanism represented by the crack phase‐field, the thermal deterioration mechanism is also considered by a temperature‐dependent thermal damage variable. The numerical implementation of the proposed model into the multi‐field finite element method is then briefly addressed. Several representative numerical examples, for example, thermally induced cracking in energy storage structures, thermal shock in quenched concrete plates, mode‐I and mixed‐mode failure of notched beams at high temperatures, and so forth, are presented for the validation. The effects of various expressions for the transient creep strain (TCS) on the global behavior of concrete structures are also studied. As in those purely mechanical problems, both the predicted crack pattern and global responses for all examples are insensitive to the incorporated phase‐field length scale. Being able to capture the fully coupled thermo‐mechanical fracture in concrete, the proposed phase‐field cohesive model, combined with a reliable hydro‐chemo‐thermal analysis, is promising in assessing the integrity and safety of concrete structures at high temperatures like fire scenarios.

show abstract

Phase field modelling of dynamic thermal fracture in the context of irradiation damage

Cited by 20 publications

References 14 publications

Computational chemo-thermo-mechanical coupling phase-field model for complex fracture induced by early-age shrinkage and hydration heat in cement-based materials

Computational chemo-thermo-mechanical coupling phase-field model for complex fracture induced by early-age shrinkage and hydration heat in cement-based materials

A phase field modeling of dynamic brittle fracture at finite strains

A length scale insensitive phase‐field model for fully coupled thermo‐mechanical fracture in concrete at high temperatures

Contact Info

Product

Resources

About