Micromechanical analysis of dynamic behavior of conventional and negative Poisson's ratio foams

Article Abstract:

The negative Poisson's ratio foams have lower cut-off frequencies for acoustic waves as compared to conventional ones. This is attributed to the larger curvature of foam cell ribs in the negative version as compared to the conventional ones. The dispersion of acoustic waves and cut-off frequencies shown by these foams is attributed to micro-vibrations of the foam cell ribs. The vibrations may be straight, curved or convoluted. Foams with lower cut-off frequencies are useful for applications that require sound absorption.

Observations, Foamed materials, Sound-waves, Sound waves

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Analysis and testing of dynamic micromechanical behavior of composite materials at elevated temperatures

Article Abstract:

A newly developed high temperature impulse-frequency response device is utilized to directly measure dynamic modulus and internal damping of high temperature composite materials, matrix materials and reinforcing fibers as function of temperature. An extensional vibration test was employed for measuring the complex Young's modulus of fiber specimens as a function of temperature. Micromechanics calculations of composite moduli and damping at high temperatures indicate good agreement for the 90 degrees case.

Composite materials

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Micromechanical approach of lamellar nano-composites: influence of the microstructure on the yield strength

Article Abstract:

Micromechanical approaches give only few references related to glide mechanisms in a lamella and especially load transfer mechanism between lamellae in pearlites. The characterization of some interface-related deformation mechanism, through Eshelby-KronerEs formalism is observed.

Science & research, Thermal properties, Microstructure, Microstructures

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