Metal Matrix Composite Beams Research Articles

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

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.

3D Micro-Structural Modeling of Vibration Characteristics of Smart Particle-Reinforced Metal-Matrix Composite Beams

In this study, the effects of micro-structural parameters such as particle volume fraction, size and random distribution of Al 6061/SiC particulate metal-matrix composite (MMC) beams on free vibration response and the active vibration control are investigated. For this purpose, numerical particle-reinforced MMC (PRMMC) beam specimens were modeled with 3D finite elements, and the cubic-shaped reinforcing SiC particles were randomly distributed in Al 6061 metal matrix similar to an actual micro-structure. The particle size and especially volume fraction play an important role on the natural frequencies of the smart PRMMCs although they have no effect on the mode shapes. The random particle distribution has minor effect on the natural frequencies of the smart PRMMCs. With the increase of the feedback control gain, both the vibration amplitude and the suppression time are reduced reasonably. Increasing the particle volume fraction induces an important reduction in the damping time and the vibration amplitude for both the controlled and uncontrolled damped vibrations. Finally, increasing the particle size decreases the vibration suppression capacity and increases the vibration amplitude and time slightly. Random particle distribution had no obvious effect on the uncontrolled and controlled vibrations.

Elastic and Plastic Stress Analysis of Composite Beams under Distributed Load

An analytical elastic-plastic stress analysis is carried out on metal-matrix composite beams of arbitrary orientation, supported from two ends under a transverse uniformly distributed load. The composite layer consists of stainless steel fiber and aluminum matrix. The material is assumed to be perfectly plastic during the elastic–plastic solution. The intensity of the uniform force is chosen at a small value; therefore, the normal stress component is neglected in the elastic-plastic solution. The expansion of the plastic region and plastic stress component of σxare determined for orientation angles of 0, 30, 45, 60 and 90o. Plastic yielding occurs for 0 o and 90 o orientation angles on the lower and upper surfaces of the beam at the same distances from the mid-point. However, it starts first at the lower surface for 30, 45 and 60 o orientation angles.

Fracture and mechanical properties of steel fibre reinforced Zn–5Al (Zamak 5) alloy

Steel fibre reinforced Zn–5Al alloy (Zamak 5) metal matrix composite beams with different volume fractions of steel fibres were produced with varying notch to depth ratios. The fracture and mechanical properties of the specimens were investigated for their mode I fracture behaviour using three point bending tests under static loading at room temperature. Steel fibres with contents of 1, 2 and 3% of the total volume of Zn–5Al alloy were used as matrix materials. The critical stress intensity factor was determined using the initial notch depth method.

An Elasto-Plastic Stress Analysis of Simply Supported Aluminum Metal Matrix Composite Beams Under a Transverse Linearly Distributed Load by Use of Anisotropic Elasticity Theory

An Elasto-Plastic Stress Analysis of Simply Supported Aluminum Metal Matrix Composite Beams Under a Transverse Linearly Distributed Load by Use of Anisotropic Elasticity Theory

An Elastoplastic Stress Analysis of Aluminum Alloy Metal-Matrix Composite Beams under a Transverse Linearly Distributed Load by Use of Anisotropic Elasticity Theory

Beams are structural elements loaded transversely in general conditions. This loading causes shear forces and bending moment. In this study, an analytical elastoplastic stress analysis is carried out on simply supported stainless steel fiber-reinforced aluminum alloy metal-matrix composite beams under linearly distributed load by use of anisotropic elasticity theory. In the elastoplastic solution, the material is assumed to be perfectly plastic. Sample problems are given for various angles analytically. The yielding begins at the upper and lower surfaces of the beam at the same distances from the ends. The intensity of residual stress component of σ x is a maximum at the upper and lower surfaces whereas the residual stress component of τ xy is maximum on the x axis of the beam. The composite beams can be strengthened by using the residual stresses.

An Elastic-Plastic Stress Analysis in Silicon Carbide Fiber-reinforced Magnesium Metal-Matrix Composite Beam having Rectangular Cross Section under Transverse Loading

In this work, an elastic-plastic stress analysis has been conducted for silicon carbide fiber-reinforced magnesium metal-matrix composite beam. The composite beam has a rectangular cross section. The beam is cantilevered and is loaded by a single force at its free end. In solution, the composite beam is assumed perfectly plastic to simplify the investigation. An analytical solution is presented for the elastic-plastic regions. In order to verify the analytical solution results were compared with the finite element method. A rectangular element with nine nodes has been chosen. A composite plate is meshed into 48 elements and 228 nodes with simply supported and in-plane loading conditions. Predictions of the stress distributions of the beam using finite elements were overall in good agreement with the analytical values. Stress distributions of the composite beam are calculated with respect to its fiber orientation. Orientation angles of the fiber are chosen as 0, 30, 45, 60, and 90. The plastic zone expands more at the upper side of the composite beam than at the lower side for 30, 45, and 60 orientation angles. Residual stress components of x and xy are also found in the section of the composite beam.

An Elasto-plastic Stress Analysis of Aluminum Metal-Matrix Composite Beam Subjected to Transverse Linearly Distributed Load

An analytical elasto-plastic stress analysis is carried out on metal-matrix composite beams supported from two ends under transverse linearly distributed load. The composite beam consists of stainless steel fiber and aluminum matrix. The material is assumed to be perfectly plastic for the elasto-plastic solution. The expansion of the plastic region and the residual stress component of x and τxy are determined for 0, 30, 45, 60, and 90 orientation angles. The yielding begins at the upper and lower surfaces of the beam at the same distances from the ends. The intensity of residual stress component of x is maximum at the upper and lower surfaces but residual stress component of τxy is maximum on the x axis of the beam. The strength of the beam is increased by residual stresses.

An elastic-plastic stress analysis in silicon carbide fiber reinforced magnesium metal matrix composite beam having rectangular cross section under transverse loading

In this work, an elastic-plastic stress analysis has been conducted for silicon carbide fiber reinforced magnesium metal matrix composite beam. The composite beam has a rectangular cross section. The beam is cantilevered and is loaded by a single force at its free end. In solution, the composite beam is assumed perfectly plastic to simplify the investigation. An analytical solution is presented for the elastic-plastic regions. In order to verify the analytic solution results were compared with the finite element method. An rectangular element with nine nodes has been choosen. Composite plate is meshed into 48 elements and 228 nodes with simply supported and in-plane loading condations. Predictions of the stress distributions of the beam using finite elements were overall in good agreement with analytic values. Stress distributions of the composite beam are calculated with respect to its fiber orientation. Orientation angles of the fiber are chosen as 0° , 30°, 45°, 60° and 90°. The plastic zone expands more at the upper side of the composite beam than at the lower side for 30°, 45° and 60° orientation angles. Residual stress components of σX and τxy are also found in the section of the composite beam.

An Elastic-Plastic Stress Analysis of Aluminum Metal-Matrix Composite Beams Supported from Two Ends with a Force Acted at the Mid Point

An analytical elastic-plastic stress analysis is carried out on an aluminum metal-matrix composite beam reinforced by unidirectional steel fibers supported at the ends acted upon with a force at the mid point. The expansion of the plastic region and the residual stress component of x are determined for 1/4 0, 30, 45, 60 and 90° orientation angles. Plastic yielding occurs for 0 and 90° orientation angles on the lower and upper surfaces of the beam at the same distances from the mid point. But, it starts first at the upper surface for 30, 45 and 60° orientation angles. The residual stress components are obtained after releasing the external force. The residual stress component of x is maximum at the lower and upper surfaces. It becomes greater on the boundary of elastic and plastic regions at distant cross sections from the origin. However, the intensity of the residual stress component xy is maximum on or around the x axis of the beam. The beam can be strengthened by using the residual stresses.

ELASTIC-PLASTIC THERMAL STRESS ANALYSIS IN ALUMINUM METAL-MATRIX COMPOSITE BEAM: ANALYTIC SOLUTION

In this study, an elastic-plastic thermal stress analysis is carried out on a metal-matrix composite beam. Temperature is chosen to vary linearly along the sections of the beam. The beam is made of a stainless steel fiber aluminum metal-matrix composite. It has rigid smooth planes at the ends. The solution is found at 0, 30, 45, 60, and 90 orientation angles. The intensity of the residual stress component of σ x is maximized at the upper and lower surfaces of the beam and for an orientation angle of 0. In addition, the equivalent plastic strain is found to be greatest at the same orientation angle. Plastic yielding begins on the beam at higher orientation angles at lower temperatures.

An elastic–plastic stress analysis of simply supported metal-matrix composite beams under a transverse uniformly distributed load

An analytical elastic–plastic stress analysis is carried out on metal-matrix composite beams of arbitrary orientation, supported from two ends under a transverse uniformly distributed load. The composite layer consists of stainless steel fiber and aluminum matrix. The material is assumed to be perfectly plastic during the elastic–plastic solution. The intensity of the uniform force is chosen at a small value; therefore, the normal stress component σ y is neglected in the elastic–plastic solution. The expansion of the plastic region and the residual stress component of σ x are determined for orientation angles of 0, 30, 45, 60 and 90°. Plastic yielding occurs for 0° and 90° orientation angles on the lower and upper surfaces of the beam at the same distances from the mid-point. However, it starts first at the lower surface for 30, 45 and 60° orientation angles. The intensity of the residual stress component of σ x is found to be maximum at the lower and upper surfaces; however, the intensity of the residual stress component of τ xy is a maximum on or around the x axis of the beam.

An Elasto-Plastic Stress Analysis on a Metal Matrix Composite Beam of Arbitrary Orientation Supported from Two Ends under a Transverse Uniformly Distributed Load

An analytical elastic-plastic stress analysis is carried out on a metal-matrix composite beam of arbitrary orientation supported from two ends under a transverse uniformly distributed load. The composite layer consists of stainless steel fiber and aluminum matrix. The material is assumed to be perfectly plastic in the elasto-plastic solution. The intensity of the uniform force is chosen at a small value; therefore the normal stress component of σy is neglected during the elasto-plastic solution. The expansion of the plastic region and the residual stress component of σx are determined for 0°, 30°, 45°, 60° and 90° orientation angles. Plastic yielding occurs for 0° and 90° orientation angles on the lower and upper surfaces of the beam at the same distances from the mid point. However; it starts first at the lower surface for 30°, 45° and 60° orientation angles. The intensity of the residual stress component of σx is found maximum at the lower and upper surfaces. However; the intensity of residual stress component τxy is maximum on or around the x axis of the beam.

An elastic–plastic thermal stress analysis of aluminum metal–matrix composite beams

In this study, an elastic–plastic thermal stress analysis is carried out on steel fiber-reinforced aluminum metal–matrix composite beams. Temperature is chosen to vary linearly. It is zero and T 0 at the upper and lower surfaces, respectively. The beam is fixed by two rigid planes at the ends. The solution is performed at 0°, 30°, 45°, 60° and 90° orientation angles. The plastic region is expanded at the lower side of the beam. It is found that the intensity of the residual stress component of σ x and the equivalent plastic strain are maximum at lower surface of the beam. The residual stress is found to be greatest for the 0° orientation angle. In addition, the intensity of the equivalent plastic strain is the greatest for the same angle.

Exact solution of elasto-plastic stresses in a metal-matrix composite beam of arbitrary orientation subjected to transverse loads

An analytical elasto-plastic stress analysis is presented for a metal-matrix composite beam of arbitrary orientation subjected to a single transverse force applied to the free end of the beam and a uniformly distributed load. The material is assumed to be perfectly plastic in the elasto-plastic solution. A composite consisting of stainless-steel-reinforced aluminum was produced for this work. Sample problems are given for various orientation angles. Elastic, elastoplastic and residual normal and shear stresses are calculated. The location of the elasto-plastic boundary of the beam is obtained according to the x coordinates of the beam.

Linear stress relations for a metal matrix composite sandwich beam with any core material

In this paper, it is shown that shear stresses are developed in the interface between the facing material and the core of a sandwich beam. The sandwich beam is composed of a core of any suitable material sandwiched between an upper unreinforced metal facing and a bottom facing made from metal matrix composite (MMC) material. The shear stress is shown to be a consequence of the differences in the core and facing elastic moduli. The magnitude of the shear stress increases as the core stiffness is made to diminish. The shear stress can exceed the bond strength between facing and core, resulting in delamination. Consequently, structural materials using this type of construction and particularly flexural experiments should contain a relatively stiff core. The magnitude of the facing stresses is shown to be relatively insensitive to the assumption or neglect of these shear stresses. In the worst case considered, neglecting the interfacial shear stresses results in an overestimation of the compressive and tensile stresses by less than 5%.

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

A theory for measuring non-linear stress-strain curves and elastic properties of metal matrix composite (MMC) sandwich beams subjected to pure bending loads is discussed. The beam is made from any core material sandwiched between an upper facing of unreinforced metal and a lower facing of MMC with unidirectional fibre reinforcement or vice versa. The model developed shows that the determination of the position of the neutral axis is critical to the measurements discussed in this paper. The analysis removes the restriction of the effects of the core. With the aid of this model, we show that the position of the neutral axis can be determined directly from surface strain measurements. Measurements of neutral axis position lead directly to the determination of the beam elastic properties and, thus, directly obtained from surface strain measurements. It is shown that the model predicts longitudinal stresses and strains within any layer of the beam. The analysis includes the limiting case of a very weak core material. A consequence of this model is the determination of the MMC facing fibre volume fraction. A detailed error analysis predicts that the longitudinal elastic modulus of an MMC material facing can be obtained with an uncertainty between 4 and 6% if the surface strain measurements and beam dimensions can be obtained with an uncertainty of 1%. The volume fraction can be obtained within 10% uncertainty, although better methods are available for that measurement.