Effect of Coarse Aggregate Type on the Residual Velocity of Rigid Projectile Perforating Concrete Target

2014 ◽  
Vol 527 ◽  
pp. 7-12
Author(s):  
Zhao Jun Zhang ◽  
Xiao Ming Wang ◽  
Wen Bin Li
Keyword(s):  
Finite Element ◽  
Coarse Aggregate ◽  
Interfacial Transition Zone ◽  
Finite Element Code ◽  
Residual Velocity ◽  
3D Finite Element ◽  
Coarse Aggregates ◽  
Rigid Projectile ◽  
Concrete Model ◽  
Mortar Matrix

Algorithms for generating and distributing random 3D sphere coarse aggregates were proposed. The 3D finite element mesoscale concrete model, which consists of mortar matrix and coarse aggregates, was established based on the theory of background element and material identification. The interfacial transition zone was simplified as a kind of contact between elements. Based on this model, continuous finite element code was used to simulate the process of rigid projectiles perforating concrete targets and the effect of 3 different coarse aggregate types on residual velocities was analyzed. This work indicates that the strength and density of coarse aggregates affects the residual velocity under lower and higher impact velocity respectively.

ON THE PROTECTION CAPABILITY OF THE FLYING PLATE AGAINST TO LONG-ROD PENETRATORS

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1285-1290
Author(s):  
STANISLAV ROLC ◽  
JAROSLAV BUCHAR ◽  
ZBYNEK AKSTEIN
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Results ◽  
Finite Element Code ◽  
Plate Material ◽  
3D Finite Element ◽  
Plate Velocity ◽  
Long Rod ◽  
Protection Capability

The interaction of the flying plate with the Long-rod penetrator has been studied both experimentally and numerically using the LS DYNA 3D finite element code. The influence of the plate velocity and plate material on this interaction has been investigated in details. Numerical results show that there was a relatively large damage of the projectiles. The extent of this damage well agree with our experimental foundings. The numerical simulation of the damaged projectiles with some targets has been also performed

Finite Element Analysis of Compressive Strength of Recycled Coarse Aggregate-Filled Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 331-334
Author(s):  
Jing Li ◽  
Zhen Liu ◽  
Xian Feng Qu ◽  
Chong Qiang Zhu ◽  
Yuan Zhang
Keyword(s):  
Finite Element ◽  
Compressive Strength ◽  
Mechanical Model ◽  
Coarse Aggregate ◽  
Geometric Model ◽  
Element Analysis ◽  
Recycled Coarse Aggregate ◽  
Coarse Aggregates ◽  
Concrete Blocks ◽  
Simulation Results

In order to study prism compressive strength of recycled coarse aggregates-filled concrete, recycled coarse aggregates of particle size for 40-80mm were made from abandoned brick and concrete blocks. 4 groups of recycled coarse aggregates-filled concrete prism objects were made, and the compressive strength of the specimens were done. Using the finite element analytical software(ANSYS) , the stress nephogram and fractured condition of recycled coarse aggregate-filled concrete were obtained after the establishment of the geometric model, calculational model and mechanical model. The results showed that numerical simulation results were good agree with the actual experimental results.

scholarly journals Modeling the movement of electrostatic motors in a 3D finite element code

2000 ◽  
Vol 36 (4) ◽  
pp. 722-727 ◽  
Author(s):  
N. Boukari ◽  
Y. Lefevre ◽  
P. Spiteri
Keyword(s):  
Finite Element ◽  
Finite Element Code ◽  
3D Finite Element

MESOSCALE MODELING OF CONCRETE UNDER DYNAMIC SPLIT TENSION

2013 ◽  
Vol 07 (03) ◽  
pp. 1350028 ◽  
Author(s):  
XIAO-QING ZHOU ◽  
YONG XIA
Keyword(s):  
Coarse Aggregate ◽  
Mesoscale Model ◽  
Aggregate Size ◽  
Concrete Specimen ◽  
Generation Process ◽  
Concrete Material ◽  
Aggregate Distribution ◽  
Coarse Aggregates ◽  
Wave Distribution ◽  
Mortar Matrix

In this paper, a mesoscale model is adopted to simulate concrete behavior under dynamic split tension. The concrete material is assumed to comprise coarse aggregates, mortar matrix, and an interfacial transition zone (ITZ). In the mesh generation process, random coarse aggregate particles are generated from a certain aggregate size distribution and then placed into the mortar matrix with ITZ between the coarse aggregate edge and the mortar matrix. Different aggregate shapes, such as circular, oval, and polygons are modeled to analyze the gravel and crushed stone aggregates. Numerical simulation is used to model the dynamic damage responses of a typical cylinder concrete specimen and a cube specimen under split tension. Velocity boundary is added as the dynamic loading. Reasonable tensile stress–strain relationships are obtained at the macroscale level; and the detailed stress wave distribution and the crack pattern are obtained at the mesoscale level. These numerical results agree well with conventional experimental results. It also shows that cracks are affected by aggregate distribution.

Behavior of Concrete Permeability Considering ITZ

2011 ◽  
Vol 287-290 ◽  
pp. 1091-1096
Author(s):  
Ai Ping Yu ◽  
Hai Bo Lu ◽  
Yan Lin Zhao ◽  
Ke Yu Wei
Keyword(s):  
Diffusion Coefficient ◽  
Laboratory Test ◽  
Transition Zone ◽  
Coarse Aggregate ◽  
Chloride Ions ◽  
Interfacial Transition Zone ◽  
Experimental Results ◽  
Concrete Permeability ◽  
Chloride Ions Diffusion ◽  
Mortar Matrix

In this paper, concrete was analyzed as a composite consisting of coarse aggregate, mortar matrix and interfacial transition zone (ITZ). Because permeability of each phase are not the same, ITZ will affect the concrete permeability. Effect of ITZ on the concrete permeability was studied by laboratory test and numerical analysis.The diffusion coefficient of ITZ, mortar,and concrete can be caculated by laboratory test. The results indicate that the diffusion coefficient of ITZ is far greater than mortar，which is about 40 times of mortar. The chloride ions diffusion ignoring ITZ and considering ITZ were simulated, the results show that the diffusion coefficient of concrete was bigger when the ITZ was considered, which was closer to the experimental results.

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