Composite materials with viscoelastic stiffness greater than diamond.

Supporting Online Material for Composite Materials with Viscoelastic Stiffness Greater than Diamond

Extreme damping in composite materials with a negative stiffness phase.

Composites with negative stiffness inclusions in a viscoelastic matrix are shown to have higher stiffness and mechanical damping tandelta than that of either constituent and exceeding conventional bounds. The causal mechanism is a greater deformation in and near the inclusions than the composite as a whole. Though a block of negative stiffness is unstable, negative stiffness inclusions in a com...

Extreme anelastic responses in Zn80Al20 matrix composite materials containing BaTiO3 inclusion

Extreme anelastic responses (stiffness greater than diamond and large amplification of damping) due to the presence of a negative stiffness phase have been observed in Zn80Al20-BaTiO3 composites not only near the tetragonalorthorhombic transformation temperatures of BaTiO3 anticipated by the classical Landau theory, but far below the Curie point of BaTiO3 which can be manipulated via specific a...

Elastic, viscoelastic and viscoplastic contributions to compliance during deformation under stress in prosthodontic temporization materials

Purpose: The goal of this investigation was to characterize the compliance properties in selected polymers used for temporary (provisional crown and bridge) applications. Method: Polymethyl methacrylate (PMMA)- and polyethyl methacrylate (PEMA)-based JET and TRIM II were investigated along with two bisacryl composite resins (LUXATEMP and PROTEMP 3 GARANT). Rectangular samples of the resins were...

Experimental Micromechanics and Viscoelasticity of Biological and Bio-protective Materials

The properties of composite materials including those of biological origin depends very much upon structure. We consider here viscoelastic properties in which the stiffness depends on time or frequency, and microelastic properties in which there is dependence of stress upon spatial gradients of strain. The complex structural hierarchy of composite materials, particularly biological ones, gives ...