Numerical Simulation of Splitting Tensile Strength for Concrete

2012 ◽  
Vol 511 ◽  
pp. 142-145
Author(s):  
Hong Sun ◽  
Jing Zhang ◽  
Qian Yang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Tensile Tests ◽  
Concrete Aggregate ◽  
Aggregate Model ◽  
Weak Part ◽  
Random Aggregate ◽  
Simulation Based ◽  
Random Aggregate Model ◽  
Microscopic Damage

The random aggregate model was used to simulate the structure of concrete, and microscopic damage and crack of concrete in splitting tensile tests were simulated by Finite Element Method. The process of splitting tensile damage for concrete was studied. The result shows that the method of numerical simulation based on random aggregate model is mainly feasible, and the surface between concrete aggregate and mortar is the weak part

3D Dynamic Simulation for Random-Distributed Aggregate Model of Plain Concrete

2010 ◽  
Vol 650 ◽  
pp. 56-62
Author(s):  
Jun Hong ◽  
Li Guo ◽  
Ling Qiao ◽  
Xiao Ming Guo
Keyword(s):  
Numerical Simulation ◽  
Dynamic Simulation ◽  
Plain Concrete ◽  
Interface Fracture ◽  
Aggregate Model ◽  
Main Approach ◽  
The Real ◽  
Distributed Models ◽  
Random Aggregate ◽  
Random Aggregate Model

Since meso-structure of plain concrete can not be observed directly, numerical simulation is the main approach to obtain the model coincident with the real structure on statistics. By applying the discrete element method, we have developed the 3D dynamic simulation for random aggregate model of plain concrete. According to the real ration of mass, the spatial positions of aggregate have been obtained, which is more close-grained compared with the random-distributed models based on Monte Carlo method. Compared with the geometrical generating algorithm for 2D random polyhedral aggregate, the algorithm for 2D or 3D random polyhedral aggregate is simpler. The results are the foundation for further studying the interface fracture and chloride diffused channels.

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

Analysis of Swage Autofrettage in Metal Tube

2006 ◽  
Author(s):  
Muhammad Afzaal Malik ◽  
Muddasar Khan ◽  
Badar Rashid ◽  
Shahab Khushnood
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Research Work ◽  
Applied Pressure ◽  
Pressure Vessels ◽  
Design Parameters ◽  
Metal Tube ◽  
Fatigue Lifetime ◽  
Second Stage ◽  
Simulation Based

Autofrettage (self-hooping) is used to induce advantageous residual stresses into pressure vessels to enhance their fatigue lifetime. The process is achieved by increasing elastic strength of a cylinder with various methods such as hydraulic pressurization, mechanical swaging, or by utilizing the pressure of a powder gas. This research work deals with the swage or mechanical autofrettage of metal tubes. The objective is to attain a bore size of 125mm. Normally such a bore size is achieved with hydraulic autofrettage. However, we have used two-stage mechanical autofrettage to achieve the desired bore size. At first stage the swage diameter achieved is 118mm, and in the second stage, the diameter achieved after machining is 125mm. The temperature variation for swage is 38°C to 50°C. The applied pressure varies from 85 to 180 bars inside the tube. The process was applied to a number of tubes selected randomly. The swage autofrettage process was also analyzed using numerical simulation based on finite element method. The results of numerical simulation are compared with design parameters.

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