Direct measurements of non-linear stress-strain curves and elastic properties of metal matrix composite sandwich beams with any core material

1985 ◽  
Vol 20 (12) ◽  
pp. 4421-4430 ◽  
Author(s):  
Jacques E. Schoutens
Keyword(s):  
Metal Matrix Composite ◽  
Elastic Properties ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Core Material ◽  
Sandwich Beams ◽  
Stress Strain ◽  
Composite Sandwich ◽  
Direct Measurements ◽  
Non Linear

Semi-active vibration control of SiC-reinforced Al6082 metal matrix composite sandwich beam with magnetorheological fluid core

2019 ◽  
Vol 234 (3) ◽  
pp. 408-424 ◽  
Author(s):  
J Vipin Allien ◽  
Hemantha Kumar ◽  
Vijay Desai
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Damping Ratio ◽  
Sandwich Beam ◽  
Magnetorheological Fluid ◽  
Sandwich Beams ◽  
Composite Sandwich ◽  
Fluid Core ◽  
Silicon Carbide Particles

Dynamic characterization of silicon carbide particles reinforced Al6082 alloy metal matrix composite sandwich beam with magnetorheological fluid core is experimentally investigated. The study is focused on determining the effect of magnetorheological fluid core on the dynamic behavior of the sandwich structure. The magnetorheological fluid core is enclosed between the top and bottom metal matrix composite beams. The metal matrix composite beams are cast with silicon carbide particles in Al6082 alloy varying from 0 to 20 wt%. The magnetorheological fluid is prepared in-house and contains 30 vol.% carbonyl iron powder and 70 vol.% silicone oil. The free vibration test is conducted to determine the natural frequencies and damping ratio. It is found that the natural frequencies and damping ratio of the sandwich beams increased with an increase in the applied magnetic flux density. The experimental forced dynamic response of sandwich beams is carried out using sine sweep excitation. Vibration amplitude suppression capabilities of the sandwich beams subjected to varying magnetic flux densities are determined. The experimental forced vibration results reveal that metal matrix composite–magnetorheological fluid core sandwich beams have excellent vibration amplitude suppression capabilities.

scholarly journals Nonlinear Stress and Deformation Behaviour of Composite Sandwich Beams

2008 ◽  
Vol 13-14 ◽  
pp. 91-98 ◽  
Author(s):  
E.E. Gdoutos ◽  
I.M. Daniel
Keyword(s):  
Experimental Results ◽  
Core Material ◽  
Sandwich Beams ◽  
Stress Strain ◽  
Normal Stress Distribution ◽  
Nonlinear Load ◽  
Composite Sandwich ◽  
The Core ◽  
Nonlinear Stress ◽  
Load Displacement

The nonlinear load-displacement and normal stress distribution in composite sandwich beams made of unidirectional carbon/epoxy facings and PVC foam cores under bending was studied. The carbon/epoxy after an initial linear response exhibits a stiffening nonlinearity in tension and a softening nonlinearity in compression with the longitudinal strength in tension higher than that in compression. The foam core also presents a nonlinear stress-strain response. It was obtained that the load-displacement behaviour of the beam, after an initial linear part, is not linear. This behavior was modeled by an incremental strength of materials nonlinear analysis. The theoretical predictions were in good agreement with the experimental results. Furthermore, it was obtained that the neutral axis of sandwich beams under bending does not pass through the centroid of the cross section, but is displaced toward the tensile side of the beam. Experimental results by moiré measurements of the in-plane horizontal displacements of the core material corroborated the analytical predictions. These findings imply higher compressive and smaller tensile stresses in the core, than those predicted for facings with identical stress-strain behaviour in tension and compression, and should be taking into consideration in the failure analysis of sandwich beams.

Stiffness Degradation in Metal Matrix Composites Caused by Thermomechanical Fatigue Loading

1993 ◽  
Author(s):  
Sait Aksoy
Keyword(s):  
Metal Matrix Composite ◽  
Elastic Properties ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Transversely Isotropic ◽  
Fatigue Loading ◽  
Thermomechanical Fatigue ◽  
Matrix Composites ◽  
Stiffness Properties ◽  
Cycles To Failure

Damage during thermomechanical fatigue loading of a metal matrix composite is represented by a vector. The undamaged material is characterized by the generalized Hooke’s law for transversely isotropic materials. The residual elastic properties of metal matrix composite are related to the initial elastic properties by the damage vector. The residual stiffness properties are then correlated with the number of fatigue cycles to failure. The ability to use this concept to determine the safe strength requirement for a given cyclic life is discussed.

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