Overview of Numerical Simulation Model of Mesoscopic Concrete Crack

2015 ◽  
Vol 744-746 ◽  
pp. 1443-1447
Author(s):  
Si Qi Li ◽  
Yin Bai
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Element Model ◽  
Crack Model ◽  
Discrete Fracture Model ◽  
Model Studies ◽  
Concrete Crack ◽  
Fracture Models ◽  
Smeared Crack ◽  
Smeared Crack Model

Through a number of literature analysis and research, this paper investigates the reviews and comparison under the meso model for numerical simulation of crack in a finite element model (FEM), including discrete fracture model, smeared crack model, fracture mechanics crack model,bond crack model. Studies show that: compared to other fracture models , smeared crack model by eliminating the need to change the unit type and re-division unit grid computing simple and widely used for treatment of concrete cracks in finite element method, the author cites a using smeared crack model example that are discussed in the paper.

Numerical Simulation Analysis of Buried Ground Fissures’ Propagation in Xi’an

2012 ◽  
Vol 170-173 ◽  
pp. 1218-1225
Author(s):  
Cong Liu ◽  
Li Wei Chen ◽  
Yan Qiu Leng ◽  
Jian Wei Qiao
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Fracture Morphology ◽  
Tensile Failure ◽  
Crack Model ◽  
Ground Fissure ◽  
Ground Fissures ◽  
Smeared Crack ◽  
Key Issues ◽  
Smeared Crack Model

Ground fissure disasters are main environmental geological hazards in Xi’an. Therefore, carrying out researches on causes of cracks and mechanisms of hazard-formative, as well as setting economical and effectively countermeasures are major geological disaster puzzles to be solved.According to the key issues existing in the ground fissure researches, we use numerical simulation analysis method to solve them. Numerical simulation analysis shows that, it is reasonable that we use elastic breaking theory to describe its rupture propagation process. This paper introduces smeared crack model and explains the fracture morphology and process of sample which has microcracks inside it. Results show that such sample’s tensile strength is greatly weakened and its tensile failure is brittle fracture. Differential subsidence movement on both sides of the buried ground fissure (fault) not only leads to upwards propagation of existing cracks, whose tendency are opposite to the existing ones, but also leads to the development of nearly vertical crack belt, which is located on the uplift block and develop from top to down. Because of width of buried ground fissures’ affected zone depends on many factors, there are still lots of work to be done on the division of buried ground fissure’s deformation zone.

Numerical Simulation of the Effects of Preheating on Electron Beam Additive Manufactured Ti-6Al-4V Build Plate

2016 ◽  
Vol 879 ◽  
pp. 274-278 ◽  
Author(s):  
Jun Cao ◽  
Philip Nash
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Finite Element ◽  
Electron Beam ◽  
Cross Section ◽  
Element Model ◽  
Normal Direction ◽  
Thermal Residual Stresses ◽  
Longitudinal Residual Stress ◽  
Middle Cross Section

In an earlier study, a 3-D thermomechanical coupled finite element model was built and experimentally validated to investigate the evolution of the thermal residual stresses and distortions in electron beam additive manufactured Ti-6Al-4V build plates. In this study, an investigation using this robust and accurate model was focused on an efficient preheating method, in which the electron beam quickly scanned across the substrate to preheat the build plate prior to the deposition. Various preheat times, beam powers, scan rates, scanning paths and cooling times (between the end of current preheat scan/deposition layer and the beginning of the next preheat scan/deposition layer) were examined, and the maximum distortion along the centerline of the substrate and the maximum longitudinal residual stress along the normal direction on the middle cross-section of the build plate were quantitatively compared. The results show that increasing preheat times and beam powers could effectively reduce both distortion and residual stress for multiple layers/passes components.

A Simplified Method Study of Aluminium Alloy Fatigue Crack Tip Parameters Computed by Elastic-Plastic Finite Element Model

2010 ◽  
Vol 97-101 ◽  
pp. 2748-2751
Author(s):  
Xin Song ◽  
Jing Zhong Xiang ◽  
Jia Zhen Zhang
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Aluminium Alloy ◽  
Crack Tip ◽  
Element Model ◽  
Crack Model ◽  
Dynamic Crack ◽  
Elastic Plastic ◽  
Static Crack ◽  
Element Computation

Fatigue crack propagation of aluminium alloy 7049-OA has been studied by non-linear finite element business-oriented software ABAQUS, and elastic-plastic finite element models of static fatigue crack and dynamic fatigue crack of center crack panel (CCP) specimens are also built. Based on the finite element computation results, the differences of stress and crack opening displacement around crack tip of static crack model have been compared with those of dynamic crack model. The compared results showed that the finite element computation results of dynamic crack model can be replaced by the results calculated by the static crack model. Fatigue crack tip parameters of aluminium alloy CCP specimens can be calculated by elastic-plastic finite element model of static crack. This is an effective method to cut down the computation expense and promote the computational efficiency.

Research on the Straightening Deformation Process of the Residual Stress of the Numerical Simulation for Different Kinds of Heavy Rail

2012 ◽  
Vol 430-432 ◽  
pp. 492-496
Author(s):  
Yu Yan Liu ◽  
Hao Li ◽  
Lin Chen
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Finite Element ◽  
Deformation Process ◽  
Element Model ◽  
Regional Deformation ◽  
Distribution Rule ◽  
Deformation Area ◽  
The Finite Element Model ◽  
Heavy Rail

Through out the establishment of heavy rail entity model and the finite element model of straightening for different kinds of heavy rail after the residual stress in straightening investigated . Analysed U75V、U76CrRE、U71Mn and U75VM the four different kinds in 8+1 level straightening of the seven regional deformation area rail head, rail waist, rail base vertical stress distribution rule.

Numerical Simulation of Steel Grid Structure under High Temperature

2013 ◽  
Vol 838-841 ◽  
pp. 458-461
Author(s):  
Jing Cui ◽  
Ling Feng Yin ◽  
Xiao Ming Guo ◽  
Gan Tang ◽  
Tian Jiao Jin
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
High Temperature ◽  
Finite Element Model ◽  
Numerical Method ◽  
Nonlinear Interaction ◽  
Element Model ◽  
Fire Tests ◽  
Grid Structure ◽  
Test Models

Based on the fire tests of WILLIAMS double-poles structure, considering the dual nonlinear interaction of material and geometric, established one complete finite element model of grid structure. For the performance that the physical and mechanics properties of steel will degrade while the temperature arising, simulate the test models with ANSYS, get a better numerical results, proof the numerical method is feasible.

Uncertainty of the smeared crack model applied to RC beams

2020 ◽  
Vol 233 ◽  
pp. 107088 ◽  
Author(s):  
Arvydas Rimkus ◽  
Vladimir Cervenka ◽  
Viktor Gribniak ◽  
Jan Cervenka
Keyword(s):  
Crack Model ◽  
Rc Beams ◽  
Smeared Crack ◽  
Smeared Crack Model
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