A General Magneto-Elastic Model of Terfenol-D Particle Actuated Composite Materials

2000 ◽  
Author(s):  
William D. Armstrong

Abstract A new theory is presented of the nonlinear multi-axial magneto-elastic behavior of magnetostrictive particle actuated composite materials. The analysis assumes a uniform external magnetic field is operating on a large number of well distributed, crystallographically and shape parallel ellipsoidal magnetostrictive particles encased in an elastic, nonmagnetic composite matrix. Comparisons between experimental and model magnetostriction results show that the model is able to provide a quantitatively correct dependence on particulate volume fraction and longitudinal stress and quantitatively accurate magnetostriction curves for both homogenous Terfenol-D rod and magnetically ordered Terfenol-D particulate actuated epoxy matrix composites over experimentally applied field ranges.

Author(s):  
M. Chomiak

Purpose: of this paper is to develop a new generation of polymer composite materials that would ensure the use of residual and serious environmental problems of polyester-glass laminate waste. Design/methodology/approach: The glass reinforced polyester waste was ground and added to produce new composites. Thermoplastic - high impact polystyrene was selected for the composite matrix. Composites containing 10, 20, 30% by weight of the filler of polyester-glass laminate powder were made. The process of extrusion and subsequent injection was used to prepare the test samples. The influence of the filler on selected properties of composites was evaluated. The physical properties of the filler as well as the processing properties of the mixture as well as the mechanical properties - impact strength and tensile strength of the obtained composites were investigated. Findings: A decrease in tensile strength and impact strength was observed along with an increase in the amount of filler. Research limitations/implications: It would be interesting to carry out further analyzes, in particular with a higher volume fraction of the filler or with a different composite structure, e.g. using PVC as a matrix. The developed research topic is a good material for the preparation of publications of a practical and scientific nature, especially useful in the research and industrial environment. Practical implications: The shredded glass-polyester waste can be used as a filler of polystyrene, however, the resulting composite could be used to produce parts with slightly less responsible functions such as artificial jewelery or toy elements. Originality/value: Obtained results are a new solution a global waste management solution for glass reinforced polyester waste, which may contribute to the sustainable development of the composite materials industry through the partial utilization of waste composites with a duroplastic matrix.


2012 ◽  
Vol 535-537 ◽  
pp. 14-17
Author(s):  
Long Hua Zhong ◽  
Yu Tao Zhao ◽  
Song Li Zhang ◽  
Rong Wen

In situ TiB2/6061 composites have been successfully synthesized through chemical reaction between 6061 master alloy, Al-3B master alloy and Ti powder. The composites fabricated by direct melt mixing method was investigated by Scanning Electron Microscope (SEM), Energy Dispersive x-ray Spectroscopy (EDS) and X-Ray Diffraction (XRD), The results shown the existence of TiB2particles. The size of most TiB2particles were just in micron level, and even reached to sub-micron level. The increase in microhardness and tensile strength for the as-prepared composites with 5% particulate volume fraction (PVF) are up to 26.8% and 51.2% respectively.


2008 ◽  
Vol 385-387 ◽  
pp. 329-332
Author(s):  
Xue Zhong Ding ◽  
Li Qiang Tang

The visco-elastic mechanism of particles reinforced composites has been investigated through revised Eshelby equivalent inclusion theory. A visco-elastic model is applied. Furthermore, by introducing Heaviside step function and Laplace transform, the creep constitutional equation related to strain rate effect is achieved. Finally, by equivalent inclusion theory, introducing secant modulus, the material moduli with time and volume fraction concerning Glass/ED6 particles reinforced materials have been given. The results show that the visco-elastic property of composite material is mainly determined by the visco-elastic behavior of the matrix, which meet experiment results well. It can be concluded from the results that there exits close relationship between the inclusion shape, volume fraction and loading path.


2004 ◽  
Vol 176 (5-6) ◽  
pp. 945-958 ◽  
Author(s):  
A. Rolando ◽  
A. D'Alessio ◽  
A. D'Anna ◽  
C. Allouis ◽  
F. Beretta ◽  
...  

2016 ◽  
Vol 674 ◽  
pp. 219-224 ◽  
Author(s):  
Marcin Chmielewski ◽  
Remigiusz Michalczewski ◽  
Witold Piekoszewski ◽  
Marek Kalbarczyk

In the present study, the influence of the volume fraction of graphene on the tribological properties of copper matrix composites was examined. The composites were obtained by the spark plasma sintering technique in a vacuum. The designed sintering conditions (temperature 950°C, pressing pressure 50 MPa, time 15 min) allowed obtaining almost fully dense materials. The tribological behaviour of copper-graphene composite materials was analysed. The tests were conducted using a CSM Nano Tribometer employing ball-on-plate tribosystem. The friction and wear behaviour of copper-graphene composite materials were investigated. An optical microscope, interferometer, and scanning electron microscope were used to analyse the worn surfaces. In friction zone, the graphene acts as a solid lubricant, which results in the increase in the content in the composites positively influencing the tribological characteristics of the steel- Cu-graphene composite.


2013 ◽  
Vol 545 ◽  
pp. 188-192
Author(s):  
Payodhar Padhi ◽  
Sachikanta Kar

Synthesis of Al metal matrix composites (MMCs) with ceramic particulate reinforcements through casting route is associated with the problem of non-uniform distribution of particulate. The problem of non-uniform distribution is more for the case of larger particulate volume fraction. In the present study a novel method has been tried to overcome this. It involves random movement of mold containing liquid aluminium and ceramic particulates ieSiC. In the present studythe spherical mold containing molten aluminium and SiC particulates of size 50-100µm is allowed to rotate in a cylindrical drum to impart a random rotation as well translation Before the design of experiment the process simulation has already been done. Accordingly the process has been fabricated. At present the process is a crude one. Preliminary experiments show that the distributions of particles obtained by this technique are better as compared to that of stir cast composites with similar volume fraction of reinforcement. However, the result obtained by the novel technique varied as proper control over the random motion of the mold was not possible. Although uniform microstructure could be obtained in most of the experiment in some cases and certain zones the microstructure showed a non uniform distribution of particles. The temperature of mold before it is subjected to random movement is strongly influenced the particle distribution.


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