Shear stress at the interface of coaxial composites determined by the resonance of low-amplitude vibrations

ELIDA B. HERMIDA; DIEGO G. MELO

Philosophical Magazine

Taylor & Francis

Año: 2003 vol. 83 p. 1761 - 1773

1478-6435

The aim of this work is to determine the viscoelastic behaviour of the interface in a coaxial composite material made of a tough shield and a ductile core. The elastic modulus and the amplitude-independent internal friction are measured using a longitudinal oscillating resonant system at 50 kHz. The contribution of the interface is modelled as a shear stress that modifies the elastic behaviour of the constituents. The value of this shear stress is determined for different interfaces (epoxy resin–brass, epoxy resin–Pyrex and paraffin–Pyrex). The model is autovalidated by the excellent agreement between the calculated and experimental values of the internal friction (damping) of the composites.