Method for measuring surface shear stress magnitude and directio

Details Method for measuring surface shear stress magnitude and directio Method for measuring surface shear stress magnitude and directio

1994-10-20

1995-08-08

Chilcot, Jr., Richard E.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

G01M 900, G01N 2123, G01N 2761, G02F 113

Patent

active

054388791

ABSTRACT:
A method is provided for determining surface shear magnitude and direction at every point on a surface. The surface is covered with a shear stress-sensitive liquid crystal coating and illuminated by white light from a normal direction. A video camera is positioned at an oblique angle above the surface to observe the color of the liquid crystal at that angle. The shear magnitude and direction are derived from the color information. A method of calibrating the device is also provided.

REFERENCES:
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patent: 4255049 (1981-03-01), Sahm et al.
patent: 4655589 (1987-04-01), Cestaro et al.
patent: 4668916 (1987-05-01), Pech
patent: 4774835 (1988-10-01), Holmes et al.
patent: 5070729 (1991-12-01), Jensen
patent: 5223310 (1993-06-01), Singh et al.
Klein, E. J., "Liquid Crystals in Aerodynamic Testing" Astronautics and Aeronautics, vol. 6, Jul. 1968, pp. 70-73.
"A New Method for Laminar Boundary Layer Transition Visualization in Flight-Color Changes in Liquid Crystal Coatings", NASA Technical Memorandum, 87666, Jan. 1986.

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