Effect of Different Cooling Rate on the Freezing Behavior of TiB2/A356 Composite

2014 ◽  
Vol 1053 ◽  
pp. 157-164
Author(s):  
Xiu Chuan Wu ◽  
Yu Tao Zhao ◽  
Song Li Zhang ◽  
Kang Le Tian
Keyword(s):  
Composite Materials ◽  
Cooling Rate ◽  
Eutectic Silicon ◽  
Tensile Fracture ◽  
Size Refinement ◽  
Reinforced Composite ◽  
Average Grain Size ◽  
Eutectic Si ◽  
Si Content ◽  
Particle Reinforced Composite

The microstructure and tensile properties of TiB2particles reinforced A356 composite materials at different cooling rates are investigated. Experimental results show that the composition of the alloy solidification ,eutectic silicon content , morphology and size have undergone significant changes while the cooling rate increased: On one hand, α-phase grains significantly reduced, by a 50 μm average grain size refinement to 1~5μm with the evolution from coarse dendritic to rosette dendritic, or even spherical evolution; On the other hand, eutectic Si content increases, and diameter, aspect ratio also showed a decreasing trend, while the circularity is gradually increasing. Meanwhile, with the increasing of cooling rate, the particle distribution of TiB2/A356 particle reinforced composite materials can be optimized. Particle aggregation is reduced, as a result TiB2particles’ reinforcement is more obvious, and the tensile fracture shows the obvious characteristics of ductile fracture.

Fiber- and Particle-Reinforced Composite Materials with the Gurtin-murdoch and Steigmann-Ogden Surface Energy Endowed Interfaces

2021 ◽  
Author(s):  
Sonia Mogilevskaya ◽  
Anna Y Zemlyanova ◽  
Volodymyr Kushch
Keyword(s):  
Composite Materials ◽  
Material Science ◽  
Composite Structures ◽  
Relevant Literature ◽  
Drastic Reduction ◽  
Comprehensive Review ◽  
Current State ◽  
Reinforced Composite ◽  
Material Surfaces ◽  
Particle Reinforced Composite

Abstract Modern advances in material science and surface chemistry lead to creation of composite materials with enhanced mechanical, thermal, and other properties. It is now widely accepted that the enhancements are achieved due to drastic reduction in sizes of some phases of composite structures. This leads to increase in surface to volume ratios, which makes surface- or interface-related effects to be more significant. For better understanding of these phenomena, the investigators turned their attention to various theories of material surfaces. This paper is a review of two most prominent theories of that kind, the Gurtin-Murdoch and Steigmann-Ogden theories. Here, we provide comprehensive review of relevant literature, summarize the current state of knowledge, and present several new results.

scholarly journals Friction Stir Processing of Particle Reinforced Composite Materials

Materials ◽  
2010 ◽  
Vol 3 (1) ◽  
pp. 329-350 ◽  
Author(s):  
Yong Gan ◽  
Daniel Solomon ◽  
Michael Reinbolt
Keyword(s):  
Composite Materials ◽  
Friction Stir Processing ◽  
Friction Stir ◽  
Reinforced Composite ◽  
Particle Reinforced Composite

scholarly journals Simulation of Composite Materials by a Network FEM with Error Control

2015 ◽  
Vol 15 (1) ◽  
pp. 21-37 ◽  
Author(s):  
Martin Eigel ◽  
Daniel Peterseim
Keyword(s):  
Composite Materials ◽  
Error Control ◽  
Degrees Of Freedom ◽  
Lattice Structure ◽  
Computational Simulation ◽  
Posteriori Error ◽  
Error Estimator ◽  
Posteriori Error Estimator ◽  
Reinforced Composite ◽  
Particle Reinforced Composite

AbstractA novel finite element method (FEM) for the computational simulation in particle reinforced composite materials with many inclusions is presented. It is based on a specially designed mesh consisting of triangles and channel-like connections between inclusions which form a network structure. The total number of elements and, hence, the number of degrees of freedom are proportional to the number of inclusions. The error of the method is independent of the possibly tiny distances of neighboring inclusions. We present algorithmic details for the generation of the problem-adapted mesh and derive an efficient residual a posteriori error estimator which enables us to compute reliable upper and lower error bounds. Several numerical examples illustrate the performance of the method and the error estimator. In particular, it is demonstrated that the (common) assumption of a lattice structure of inclusions can easily lead to incorrect predictions about material properties.

VCFEM Method Mixed with Finite Element Method Calculation of Numerical Simulation

2013 ◽  
Vol 444-445 ◽  
pp. 103-109
Author(s):  
Jia Li Xu ◽  
Ran Guo ◽  
Wen Hai Gai
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Composite Materials ◽  
High Stress ◽  
Voronoi Cell ◽  
Interface Layer ◽  
Matrix Cracking ◽  
Material Particle ◽  
Reinforced Composite ◽  
Particle Reinforced Composite

As a new type of composite material, particle reinforced composite materials, which has good mechanical properties and secondary machining, have been widely used in mechanical, biological, aerospace, military, motor and other important industrial areas. With the development of science and technology lots of research and numerical simulation have been carried on at home and aboard. Because of the reinforcements, the overall mechanical properties have been significantly improved. At the same time, fracture properties and fatigue characteristics are lower. This paper, based on the VCFEM, lead in the traditional FEM to research particle reinforced composite materials, tending to get a better result in simulating the mechanical property. The principle of the voronoi unit Based on the particle composites as the research object, combine four node isoparametric element with the voronoi cell mesh together to complete the structure calculation.to make the description of the distribution of high stress of the interface of inclusion particles more accurate. As we know that due to the reinforcement, the original features of the material have changed. To a certain extent, reduce its applicability. The interface layer is the important reason of the damage. As Fig1-1, Contact interface between particle and matrix cracking cracks. This makes a third crack boundary. means crack boundary, means inclusion particles, crack boundary, means substrate crack boundary, so we can find that at it still satisfy: (1) Fig 1 Containing inclusions, consider interface debonded voronoi cell At and because of the cracking, the two boundaries have no restraint, so satisfy the following boundary conditions (on border) (2) (on border) (3)

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