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## Full-Text Articles in Physics

A Novel Technique For Studying The Shear Elastic Properties Of Weak Solids, Jason A. Payne '93

#### A Novel Technique For Studying The Shear Elastic Properties Of Weak Solids, Jason A. Payne '93

*Honors Projects*

We have developed a simple, inexpensive, and precise technique to measure the shear elastic modulus of weak solids using electromagnetic and optical tools. This technique can be easily adapted to measure the viscosity of a liquid also. A Helmholtz pair was used to produce a torque on a permanent magnet mounted on the smaller of two concentric cylinders, coupled by the material to be studied. The torque was controlled precisely and measured accurately in terms of the current flowing through the coils of the Helmholtz pair. An optical lever was employed to measure the angular displacement of the inner cylinder ...

A Lattice Gas Approach To The Structure And Dynamics Of Electrorheological Fluids, Jie Chen '93

#### A Lattice Gas Approach To The Structure And Dynamics Of Electrorheological Fluids, Jie Chen '93

*Honors Projects*

Electrorheological fluids consist of a colloidal suspension of dielectric particles in a continuous fluid of smaller dielectric constant. Molecular dynamics simulations of these fluids in an applied electric field have recently been shown to produce percolated, columnar structures. No systematic attempt has been made so far to simultaneously include the effects of temperature and the viscous drag due to the continuous fluid. We propose a dipolar lattice gas model for electrorheological fluids and study the resulting structures and dynamics. We attempt to incorporate the effect of the viscosity of the continuous medium by a dynamic ansatz that determines the range ...