Correlation between Acoustic Emission and Internal Friction in Materials

2006 ◽  
Vol 13-14 ◽  
pp. 313-322 ◽  
Author(s):  
Alexei Vinogradov
Keyword(s):  
Acoustic Emission ◽  
Stress Relaxation ◽  
Internal Friction ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Strain Accumulation ◽  
Strain Fracture ◽  
The Difference ◽  
The Relationship ◽  
Good Agreement

The relationship between acoustic emission and internal friction is investigated during cyclic deformation of copper single- and poly-crystals at intermediate amplitudes. Good agreement between these two phenomena has been demonstrated in all materials tested as long as the stress relaxation occurs uniformly within the sample whereas the difference between them becomes pronounced when strain/fracture localisation takes place. The similarity between acoustic emission and internal friction can be extended to materials deforming without appreciable plastic deformation, such as metal matrix composites where the main source of stress relaxation and strain accumulation is the particle breakage. The significance of the relation between internal friction and acoustic emission for understanding of fundamentals of AE is discussed.

Simulation of Solidification for Metal Matrix Composites

2011 ◽  
Vol 261-263 ◽  
pp. 613-617
Author(s):  
Fu Sheng Hao ◽  
Shi Wu Gao ◽  
Ke Liang Ren
Keyword(s):  
Composite Materials ◽  
Metal Matrix ◽  
Solidification Process ◽  
Metal Composite ◽  
Matrix Composites ◽  
The Finite Element Method ◽  
The Matrix ◽  
Nonlinear Temperature ◽  
Metal Composite Materials ◽  
The Difference

The paper use the finite element method, simulating the solidification process of metal matrix composite. Obtain the changing of temperature field about the solidification process and some temperature curve for special nodes. The results show that, due to the difference of heat transfer coefficient about the matrix and the metal the solidification process for composite materials showed the irregular temperature cloud, namely nonlinear temperature distribution. The simulation actually provides some guidance for synthesis of metal composite materials.

scholarly journals Finite Element Simulation and Experimental Determination of Residual Stresses after Extrusion Process in Metal Matrix Composites

2005 ◽  
Vol 14 (4) ◽  
pp. 096369350501400
Author(s):  
G. Albertini ◽  
E. Girardin ◽  
A. Giuliani ◽  
D.E. Ilie ◽  
B.P. O'Donnell ◽  
...  
Keyword(s):  
Finite Element ◽  
Metal Matrix ◽  
Extrusion Process ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Element Analysis ◽  
Element Simulation ◽  
The Difference ◽  
Two Phases

The introduction of reinforcement in a Metal Matrix causes micro-stresses which may prove to be very detrimental for the life of the component. Submitting the components to annealing thermal treatments introduces thermal mismatch stresses. They are generated during cooling due to the difference between the thermal expansion coefficient of the two phases. Finite Element Analysis has been performed to study this effect and the results have been experimentally validated by X-ray diffraction, SEM investigation and EDAX on an AA2009 + 25% SiCp extruded shaft for helicopters, simplified as a thin extruded tube.

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