Simulation of Fracture Behavior in the Microstructure of Ceramic Tool Materials

2012 ◽  
Vol 457-458 ◽  
pp. 89-92
Author(s):  
Ting Ting Zhou ◽  
Chuan Zhen Huang ◽  
Han Lian Liu ◽  
Jun Wang ◽  
Bin Zou ◽  
...  
Keyword(s):  
Finite Element ◽  
Grain Boundary ◽  
Fracture Resistance ◽  
Fracture Behavior ◽  
Single Phase ◽  
Voronoi Tessellation ◽  
Element Model ◽  
Cohesive Element ◽  
Ceramic Tool ◽  
Tool Materials

In the paper, the Voronoi tessellation model is used to represent the microstructure of ceramic tool materials. And a finite element model based on cohesive element method has been developed to investigate the fracture behavior of the microstructure. The influences of mesh densities and cohesive parameters on the cracking patterns have been discussed. It is found that the enhancement of the grain boundary strength is beneficial for raising the fracture resistance of single-phase ceramic tool materials.

A 3D Cohesive Element Model for Fracture Behavior Analysis of Ceramic Tool Materials Microstructure

2012 ◽  
Vol 723 ◽  
pp. 119-123 ◽  
Author(s):  
Hai Bin Yu ◽  
Chuan Zhen Huang ◽  
Han Lian Liu ◽  
Bin Zou ◽  
Hong Tao Zhu ◽  
...  
Keyword(s):  
Finite Element ◽  
Grain Boundary ◽  
Crack Propagation ◽  
Voronoi Tessellation ◽  
Element Model ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Ceramic Microstructure ◽  
Microstructure Model ◽  
3D Crack Propagation

A 3D finite element polycrystalline microstructure model of ceramic tool materials is presented. Quasi-static crack propagation is modeled using the cohesive finite element method (CFEM) and the microstructure is represented by 3D Voronoi tessellation. The influences of cohesive parameters, the ratios of maximum traction of grain boundary to maximum traction of grain on the crack patterns of Al2O3 have been discussed. This study has demonstrated the capability of modeling 3D crack propagation of ceramic microstructure with CFEM and Voronoi tessellation model. It is found that the fracture mode is changed from intergranular to transgranular as the maximum traction of grain boundary is increased.

Simulation of Fabrication for Al2O3 Ceramic Tool Materials

2012 ◽  
Vol 500 ◽  
pp. 537-543 ◽  
Author(s):  
Bin Fang ◽  
Chuan Zhen Huang ◽  
Hong Tao Zhu ◽  
Chong Hai Xu
Keyword(s):  
Grain Size ◽  
Monte Carlo ◽  
Microstructure Evolution ◽  
Potts Model ◽  
Single Phase ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Fabrication Parameters

The new Monte Carlo Potts model that couples with fabrication parameters and considers pores and additives has been developed in order to simulate the fabrication of single-phase ceramics tool materials. The microstructure evolution for single-phase Al2O3 ceramic tool materials is simulated with the different technology parameters. At the same time, the single-phase Al2O3 ceramic tool materials are fabricated with the corresponding technology parameters. The errors of grain size between the simulated and the experimental is 12.1 and18.2%.

Crystal Plasticity Simulation of the Bauschinger Effect of Polycrystalline AA7075 through a Texture-Based Representative Volume Element Model

2014 ◽  
Vol 553 ◽  
pp. 22-27
Author(s):  
Ling Li ◽  
Lu Ming Shen ◽  
Gwénaëlle Proust
Keyword(s):  
Finite Element ◽  
Representative Volume Element ◽  
Crystal Plasticity ◽  
Bauschinger Effect ◽  
Voronoi Tessellation ◽  
Strain Curve ◽  
Element Model ◽  
Volume Element ◽  
Model Parameters ◽  
Representative Volume

A texture-based representative volume element (TBRVE) model is developed for the three-dimensional crystal plasticity (CP) finite element simulations of the Bauschinger effect (BE) of polycrystalline aluminium alloy 7075 (AA7075). In the simulations, the grain morphology is created using the Voronoi tessellation method with the material texture systematically discretised from experiment. A modified CP constitutive model, which takes into account the backstress, is used to simulate the BE during cyclic loading. The model parameters are calibrated using the first cycle stress-strain curve and used to predict the mechanical response to the cyclic saturation of AA7075. The results indicate that the proposed TBRVE CP finite element model can effectively capture the BE at the grain level.

Simulation of Fabrication for Single-Phase Al2O3 Ceramic Tool Materials at Different Fabrication Temperature

2010 ◽  
Vol 150-151 ◽  
pp. 1358-1363
Author(s):  
Bin Fang ◽  
Chuan Zhen Huang ◽  
Chong Hai Xu ◽  
Sheng Sun
Keyword(s):  
Mechanical Properties ◽  
Computer Simulation ◽  
Grain Size ◽  
Monte Carlo ◽  
Single Phase ◽  
Two Dimensional ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Mean Grain Size ◽  
The Mean

The fabrication is a key process for the preparation of ceramic tool materials, which governs the mechanical properties of ceramic tool materials under the condition of the same compositions. A computer simulation coupled with fabrication temperature for the hot-pressing process of single-phase ceramic tool materials has been developed using a two-dimensional hexagon lattice model mapped from the realistic microstructure without considering the presence of pores. The fabrication of single-phase Al2O3 is simulated. The mean grain size of simulated microstructure by Monte Carlo Potts model integrated with fabrication temperature increases with an increase in fabrication temperature, which is consistent with the experiment results.

A COMPUTATIONAL STUDY ON THE DEFORMATION OF NANOCRYSTALLINE NICKEL

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1517-1522
Author(s):  
JIANQIU ZHOU ◽  
SHUN LI ◽  
NAN XU
Keyword(s):  
Finite Element ◽  
Grain Boundary ◽  
Finite Element Model ◽  
Computational Study ◽  
Equivalent Plastic Strain ◽  
Element Model ◽  
Boundary Phase ◽  
Nanocrystalline Nickel ◽  
Strain And Strain Rate ◽  
Log Normal

A phase mixture based finite element model was developed and the deformation of nanocrystalline nickel was studied in this paper. Monocrystalline grain interior phase and amorphous grain boundary phase were applied in the finite element model respectively. The digital topological model, which followed the Log-normal distribution, was generated by a systematic method. The experimental strain and strain rate hardening behaviors and severe nonlinearity phenomena of nanocrystalline nickel can be predicted very well by the numerical simulation. By presenting evolution process of Mises stress and equivalent plastic strain, we found shear localization phenomenon and much faster plastic deformation in grain boundary phase. These result in the relatively lower ductility of nanocrystalline nickel compared with that of coarse-grain counterparts.

Simulation of Fabrication for Single-Phase Al2O3 Ceramic Tool Materials at Different Fabrication Pressure

2012 ◽  
Vol 499 ◽  
pp. 150-155 ◽  
Author(s):  
Bin Fang ◽  
Chuan Zhen Huang ◽  
Chong Hai Xu ◽  
Sheng Sun
Keyword(s):  
Monte Carlo ◽  
Microstructure Evolution ◽  
Potts Model ◽  
Single Phase ◽  
Two Dimensional ◽  
Ceramic Tool ◽  
Tool Materials ◽  
Mean Grain Size ◽  
The Mean ◽  
The Relationship

The relationship between fabrication pressure and microstructure evolution is proposed. A computer simulation coupled with fabrication pressure for the hot-pressing process of single-phase ceramic tool materials has been developed, which uses a two-dimensional hexagon lattice model mapped from the realistic microstructure without considering the presence of pores. The fabrication of single-phase Al2O3 is simulated. The mean grain size of simulated microstructure by Monte Carlo Potts model integrated with fabrication pressure increases with an increase in fabrication pressure, which is consistent with the experiment results. It is shown that Monte Carlo Potts model coupled with fabrication pressure may simulate the microstructure evolution of single-phase ceramic tool materials.

Simulation of Fracture Behavior in the Microstructure of Ceramic Tool Materials

2012 ◽  
Vol 457-458 ◽  
pp. 89-92
Author(s):  
Ting Ting Zhou ◽  
Chuan Zhen Huang ◽  
Han Lian Liu ◽  
Jun Wang ◽  
Bin Zou ◽  
...  
Keyword(s):  
Fracture Behavior ◽  
Ceramic Tool ◽  
Tool Materials

Effect of TiN Addition on the Low Temperature Degradation of Ceramic Tool Materials 3Y-TZP

2006 ◽  
Vol 315-316 ◽  
pp. 40-44 ◽  
Author(s):  
Jing Sun ◽  
Chuan Zhen Huang ◽  
Jun Wang
Keyword(s):  
Phase Transformation ◽  
Elastic Modulus ◽  
Low Temperature ◽  
Grain Boundary ◽  
Volume Expansion ◽  
Monoclinic Phase ◽  
Boundary Phase ◽  
Ceramic Tool ◽  
Tool Materials ◽  
The Stability

Ceramic tool materials, 3Y-TZP added by TiN particles, were fabricated through hot-pressing techniques. The effects of TiN on their low-temperature degradation at 220# in air were investigated. It is shown that TiN can improve the stability of t-ZrO2 and inhibit the transformation from tetragonal to monoclinic phase, and that the content of TiN affects the stability of tetragonal phase and the propagation of tetragonal-to-monoclinic transformation into the specimen interiors. It is suggested that the grain-boundary phase prevents the nucleation of transformation, and that the high elastic modulus of TiN can prevent the propagation of phase transformation by resisting the volume expansion of transformation. When the content of TiN is 20wt%, the ceramic material shows better low temperature degradation resistance.

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