The meso-failure mechanism of lightweight concrete simulated by the phase field method

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jichang Wang ◽  
Xiaoming Guo
Keyword(s):  
Crack Propagation ◽  
Phase Field ◽  
Lightweight Concrete ◽  
Volume Fraction ◽  
Failure Process ◽  
Damage Model ◽  
Automatic Generation ◽  
Phase Field Method ◽  
Content Type ◽  
Propagation Paths

PurposeA mesoscopic phase field (PF) model is proposed to simulate the meso-failure process of lightweight concrete.Design/methodology/approachThe PF damage model is applied to the meso-failure process of lightweight concrete through the ABAQUS subroutine user-defined element (UEL). And the improved staggered iteration scheme with a one-pass procedure is used to alternately solve the coupling equations.FindingsThese examples clearly show that the crack initiation of the lightweight concrete specimens mainly occurs in the ceramsite aggregates with weak strength, especially in the larger aggregates. The crack propagation paths of the specimens with the same volume fraction of light aggregates are completely different, but the crack propagation paths all pass through the ceramsite aggregates near the cracks. The results also showed that with the increase in the volume fractions of the aggregates, the slope and the peak loads of the force-deflection (F-d) curves gradually decrease, the load-bearing capacity of the lightweight concrete specimens decreases, and crack branching and coalescence are less likely during crack propagation.Originality/valueThe mesostructures with a mortar matrix, aggregates and an interfacial transition zone (ITZ) are generated by an automatic generation and placement program, thus incorporating the typical three-phase characteristics of lightweight concrete into the PF model.

Study of the progressive failure of concrete by phase field modeling and experiments

2021 ◽  
pp. 105678952110014
Author(s):  
Jichang Wang ◽  
Xiaoming Guo ◽  
Nailong Zhang
Keyword(s):  
Phase Field ◽  
Progressive Failure ◽  
Failure Process ◽  
Damage Model ◽  
Concrete Fracture ◽  
Opening Displacement ◽  
Three Point Bending ◽  
Edge Notch ◽  
Modeling And Experiments ◽  
Crack Faces

In this research, experiments and numerical simulations are employed to research the failure process of concrete. Fracture experiments on three-point bending (TPB) concrete beams with a prefabricated edge notch at the middle of the beam bottom are performed using a modified rigid testing instrument. The characteristics of the crack and section are analyzed, including the crack tensile opening displacement, crack length and width, and crack faces characteristics. Also, the full curves of the force-crack tensile opening displacement (CMOD) and force-deflection of the TPB beams with the prefabricated edge notch after breakage are obtained. The phase field (PF) damage model is applied to the mixed-mode and mode-I failure processes of concrete structures through the ABAQUS subroutine user defined element (UEL). The crack path and the full curves of force-CMOD and force-deflection obtained by numerical calculations are consistent with the experimental results and the calculated results of other researchers. The influences of the mesh sizes, initial lengths, and notched depths on the TPB beam of concrete are also analyzed.

Modeling crack propagation in heterogeneous granite using grain-based phase field method

2021 ◽  
pp. 103203
Author(s):  
Xunjian Hu ◽  
Xiaonan Gong ◽  
Ni Xie ◽  
Qizhi Zhu ◽  
Panpan Guo ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Phase Field ◽  
Field Method ◽  
Phase Field Method

scholarly journals Crack propagation simulation in brittle elastic materials by a phase field method

2019 ◽  
Vol 9 (6) ◽  
pp. 339-352 ◽  
Author(s):  
Xingxue Lu ◽  
Cheng Li ◽  
Ying Tie ◽  
Yuliang Hou ◽  
Chuanzeng Zhang
Keyword(s):  
Crack Propagation ◽  
Phase Field ◽  
Field Method ◽  
Phase Field Method ◽  
Elastic Materials

Simulation of Microstructure Evolution and Deformation Behavior for Dual-Phase Steel by Multi-Phase-Field Method and Elastoplastic Finite Element Method

2013 ◽  
Vol 7 (1) ◽  
pp. 16-23 ◽  
Author(s):  
Akinori Yamanaka ◽  
◽  
Tomohiro Takaki ◽  
Keyword(s):  
Finite Element ◽  
Phase Field ◽  
Deformation Behavior ◽  
Volume Fraction ◽  
Simulation Method ◽  
Phase Field Method ◽  
Element Analysis ◽  
Dp Steel ◽  
Α Phase ◽  
Multi Phase

A coupled simulation method is developed by using a Multi-Phase-Field (MPF) method that is recognized as a powerful numerical method for simulating microstructure formation in material and ElastoPlastic Finite Element Analysis (EP-FEA) based on a homogenization method. We apply the developed simulation method to investigate the deformation behavior of DP steel that includes various volume fractions and morphologies of the ferrite (α) phase. To obtain morphological information on the α phase of DP steel, we performed MPF simulation of austenite-to-ferrite (γ → α) transformation during continuous cooling transformation. MPF simulation gives us the digital image of the distribution of the simulated α phase. Furthermore, we model the representative volume element, which describes the DP microstructure, on the basis of the obtained morphology of the α phase, and perform tension-compression testing of DP steel, including the simulated α phase. Through these simulations, it is confirmed that the developed simulation method enables us to clarify the effect of the volume fraction and the configuration of the α phase on macroscopic deformation behavior of DP steel, such as the Bauschinger effect.

Microstructure Evolution in Sintering of Alumina-Zirconia Ceramics Simulated by a Modified Phase Field Method

2012 ◽  
Vol 715-716 ◽  
pp. 788-793
Author(s):  
Cheng Yang Wei ◽  
Sai Yi Li
Keyword(s):  
Grain Size ◽  
Phase Field ◽  
Volume Fraction ◽  
Field Method ◽  
Density Field ◽  
Phase Field Method ◽  
Green Density ◽  
Zirconia Ceramics ◽  
Final Density ◽  
Orientation Fields

The densification and grain growth during sintering of alumina-zirconia (Al2O3ZrO2) ceramics were simulated using a modified phase field method, which considered simultaneously a density field, a composition filed and orientation fields. The results indicate that the model can capture the main microstructure features in the different stages of sintering. A higher relative green density leads to a higher final density and a larger final grain size in the sintered ceramics. A higher volume fraction of the ZrO2 phase results in a lower relative density and a smaller final grain size.

Effects of External Stresses on the Martensitic Transformation in a 3D Polycrystalline Material Using the Phase Field Method

2013 ◽  
Vol 1535 ◽  
Author(s):  
Amer Malik ◽  
Gustav Amberg ◽  
John Ågren
Keyword(s):  
Martensitic Transformation ◽  
Phase Field ◽  
Volume Fraction ◽  
Polycrystalline Material ◽  
Landau Equation ◽  
Current Model ◽  
Field Method ◽  
Phase Field Method ◽  
Martensitic Microstructure ◽  
External Stresses

ABSTRACTIn the current study an elasto-plastic phase field (PF) model, based on the PF microelasticity theory proposed by A.G. Khachaturyan, is used to investigate the effects of external stresses on the evolution of martensitic microstructure in a Fe-0.3%C polycrystalline alloy. The current model is improved to include the effects of grain boundaries in a polycrystalline material. The evolution of plastic deformation is governed by using a time dependent Ginzburg-Landau equation, solving for the minimization of the shear strain energy. PF simulations are performed in 2D and 3D to study the effects of tension, compression and shear on the martensitic transformation. It has been found that external stresses cause an increase in the volume fraction of the martensitic phase if they add to the net effect of the transformation strains, and cause a decrease otherwise. It has been concluded that the stress distribution and the evolution of martensitic microstructure can be predicted with the current model in a polycrystalline material under applied stresses.

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