Research and application of random aggregate model in determining the fracture behavior of four-point bending beam with notch

2019 ◽  
Vol 202 ◽  
pp. 276-289 ◽  
Author(s):  
Cao Peng ◽  
Li Guodong ◽  
Yu Jiangjiang ◽  
Zhang Ming ◽  
Jin Feng ◽  
...  
Keyword(s):  
Fracture Behavior ◽  
Aggregate Model ◽  
Four Point Bending ◽  
Random Aggregate ◽  
Random Aggregate Model

Simulation of Numerical Test of Concrete Microscopic Structure by Second-Order Manifold Method

2013 ◽  
Vol 477-478 ◽  
pp. 968-971 ◽  
Author(s):  
Yan Zhao ◽  
Guo Xin Zhang ◽  
Hai Feng Li
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Fracture Process ◽  
Shear Failure ◽  
Numerical Test ◽  
Aggregate Model ◽  
The Monte Carlo Method ◽  
Random Aggregate ◽  
Random Aggregate Model ◽  
Numerical Manifold

To simulate the numerical test of concrete, the random aggregate model according to the Monte Carlo method and Fuller Graded Formula is carried out based on the assumption that the concrete is a multi-phases composite material composed of matrix. By adding the function of tracing the propagation of cracks,the Numerical Manifold Method proposed by Shi Genhua is developed which can simulate both the discontinuity of block system and the tensile or shear failure of intact block. The random aggregate model according to the Monte Carlo method and Fuller Graded Formula is carried out, and the concrete fracture process is simulated by the NMM. The strength and failure pattern are in good agreement with the experimental data, which shows that the method put forward and the program developed in this paper can effectively simulate the fracture process of concrete composed of multi-cracks.

scholarly journals Application of Base Force Element Method to Mesomechanics Analysis for Concrete

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Yijiang Peng ◽  
Yao Wang ◽  
Qing Guo ◽  
Junhua Ni
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fracture Process ◽  
Damage Mechanics ◽  
Hardened Cement ◽  
Aggregate Model ◽  
Random Aggregate ◽  
Random Aggregate Model ◽  
Force Element ◽  
Element Method

The base force element method (BFEM) on damage mechanics is used to analyze the compressive strength, the size effects of compressive strength, and fracture process of concrete at mesolevel. The concrete is taken as three-phase composites consisting of coarse aggregate, hardened cement mortar, and interfacial transition zone (ITZ) on mesolevel. The random aggregate model is used to simulate the mesostructure of concrete. The mechanical properties and fracture process of concrete under uniaxial compression loading are simulated using the BFEM on damage mechanics. The simulation results agree with the test results. This analysis method is the new way for investigating fracture mechanism and numerical simulation of mechanical properties for concrete.

Numeric Analysis of Size Effect on Mesol Concrete Random Aggregate Model

2012 ◽  
Vol 226-228 ◽  
pp. 1780-1784
Author(s):  
Xin Yu Liang ◽  
Fa Ning Dang
Keyword(s):  
Size Effect ◽  
Random Number ◽  
Aggregate Size ◽  
Aggregate Model ◽  
Concrete Material ◽  
Strength Change ◽  
Random Aggregate ◽  
Random Aggregate Model ◽  
Random Location ◽  
Effect Ratio

In order to research that statics properties of concrete cylinder sample are influenced by micro-concrete material heterogeneity, by random aggregate models generated by different random number were established. By fixed aggregate size and constantly changing of the sample size, the concrete numerical model was simulated and Strength change of concrete samples was analyzed .So that strength influence of the aggregate location of the concrete random sample was study. Calculation shows that: the strength of concrete has been little effect by the aggregate random location, the size effect on concrete has been changed regularly, with the size effect ratio coefficient of aggregate and sample gradually increasing, the error square sum of strain was reduced and the brittlness of the samples becomes obvious.

Application of Random Aggregate Model to the Problem of Concrete Penetration

2012 ◽  
Vol 446-449 ◽  
pp. 546-549
Author(s):  
Yi Zeng ◽  
Jun Lin Tao ◽  
Yong Yao ◽  
Xiao Ling Liu ◽  
Qian Hui Ren
Keyword(s):  
Aggregate Model ◽  
Random Aggregate ◽  
Random Aggregate Model

Application of Random Aggregate Model to the Problem of Concrete Penetration

2012 ◽  
Vol 446-449 ◽  
pp. 546-549
Author(s):  
Yi Zeng ◽  
Jun Lin Tao ◽  
Yong Yao ◽  
Xiao Ling Liu ◽  
Qian Hui Ren
Keyword(s):  
High Strain ◽  
Constitutive Relations ◽  
Large Strains ◽  
Two Dimensional ◽  
Penetration Test ◽  
Convex Polygons ◽  
Aggregate Model ◽  
Random Aggregate ◽  
Random Aggregate Model ◽  
Random Convex

Penetration of concrete targets was simulated based on self-compiled program generating two-dimensional random aggregate model. Random convex polygons were used to simulate the aggregate particles of concrete, HJC model to describe constitutive relations of the aggregates and mortar while concrete targets are subjected to large strains, high pressure and high strain rate. With this model, the Forrestal's penetration test was simulated by ls-dyna software. By comparing the calculated results with the test data, It is shown that random aggregate model can be applied to simulate the dynamic destruction problems of concrete-like materials.

Simulation Study of Fracture Process of Concrete Mesoscopic Structure by Manifold Method

2011 ◽  
Vol 243-249 ◽  
pp. 875-878
Author(s):  
Yan Zhao ◽  
Guo Xin Zhang ◽  
Xiao Chuan Wu ◽  
Fu Xin Chai
Keyword(s):  
Fracture Process ◽  
Shear Failure ◽  
Concrete Fracture ◽  
Aggregate Model ◽  
The Monte Carlo Method ◽  
Mesoscopic Structure ◽  
Random Aggregate ◽  
Random Aggregate Model ◽  
Numerical Manifold ◽  
Good Agreement

On the assumption that the concrete is a multi-phases composite material composed of matrix, aggregate and the bonding interface, the failure progress of concrete is simulated. It requires that numerical method not only can simulate forces and stresses, the failure growth and contacts, but also can simulate the discontinuities such as joints and cracks，the large deformation after the failure and the propagation of multi-cracks. By adding the function of tracing the propagation of cracks，the Numerical Manifold Method proposed by Shi Genhua is developed which can simulate both the discontinuity of block system and the tensile or shear failure of intact block. The random aggregate model according to the Monte Carlo method and Fuller Graded Formula is carried out, and the concrete fracture process is simulated by the NMM. The strength and failure pattern are in good agreement with the experimental data, which shows that the method put forward and the program developed in this paper can effectively simulate the fracture process of concrete composed of multi-cracks.

scholarly journals IMPROVED RANDOM AGGREGATE MODEL FOR NUMERICAL SIMULATIONS OF CONCRETE ENGINEERING SIMULATIONS OF CONCRETE ENGINEERING

2013 ◽  
Vol 19 (2) ◽  
pp. 285-295 ◽  
Author(s):  
Qin Yuan ◽  
Chai Junrui ◽  
Dang Faning
Keyword(s):  
Numerical Simulations ◽  
Three Dimensional ◽  
Cement Matrix ◽  
Aggregate Model ◽  
Three Point Bending ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Three Phase ◽  
Random Aggregate ◽  
Random Aggregate Model

In numerical simulations, concrete is usually considered as a three-phase material consisting of an aggregate, a cement matrix, and an interfacial transition zone (ITZ). Three-dimensional modeling of concrete usually requires extremely large computational requirements. In this study, an improved random aggregate model for numerical simulations of concrete is developed, which can minimize the number of elements, optimize the ITZ thickness, and create internal cracks and holes. Numerical investigations on the cracks form as well as deflection and tensile strength are also conducted based on three-point bending tests. The simulation results agree well with the experimental results.

A Simple Method of Coarse Aggregate Generation Based on PFC2d

2013 ◽  
Vol 438-439 ◽  
pp. 149-152
Author(s):  
Yu Tian Kong ◽  
Juan Wang ◽  
Zong Kun Li ◽  
Li Hong Zhang
Keyword(s):  
Cross Section ◽  
Coarse Aggregate ◽  
Concrete Specimen ◽  
Two Dimensional ◽  
Mechanical Behaviors ◽  
Aggregate Model ◽  
Simple Method ◽  
Aggregate Distribution ◽  
Random Aggregate ◽  
Random Aggregate Model

To establish an appropriate random aggregate model at meso-level is the basis for successfully simulating the meso-mechanical behaviors of concrete. This paper proposes a new simple method to generate random aggregates of concrete by PFC2d. And the distribution of aggregate in the two-dimensional concrete specimen cross-section is determined by Walraven formula. The results show that the numerical aggregate distribution matches well with the theoretical grading curve.

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