Testing viscoelastic solids for ability to withstand stress...

Details Testing viscoelastic solids for ability to withstand stress... Testing viscoelastic solids for ability to withstand stress...

G - Physics

01

N

73/81, 73/83

G01N 3/32 (2006.01) G01N 3/34 (2006.01)

Patent

CA 1068934

INVENTION: TESTING VISCOELASTIC SOLIDS FOR ABILITY TO WITHSTAND STRESS AND STRAIN INVENTORS: D. C. PREVORSEK, Y.D. KWON, R. K. SHARMA and E. T. GILLIAM Abstract of the Invention An apparatus and method for testing viscoelastic solids, such as tire cord, especially for ability to withstand stress and strain. The apparatus includes: a holding means, a pretension means, a displacement generator, and a mechanical- electrical transforming means. The holding means holds the material in a predetermined position. The pretension means applies tension during testing. The displacement generator has an eccentric means for applying cyclic displacement. The mechanical-electrical transforming means transforms mechanical motion into electrical signals, such as a stress signal, a strain signal and a differentiated strain signal. There is a phase lag between the stress signal and the strain signal and the phase lag may vary in amount and direction as a function of time. The apparatus may also include: an integrating means for integration of a stress-strain hysteresis loop; and a display means for displaying an output of the integrating means to measure the area of the hysteresis loop and thereby determine energy loss. The method includes: applying strain to the material, with resulting stress developed in the material; transforming the strain into an electrical strain signal having a strain wave form; transform- ing the resulting stress into an electrical stress signal having a stress wave form; controlling the strain to produce a substantially sinusoidal strain wave form representing strain; and allowing the stress to produce a stress wave form represent- ing stress which may be non-sinusoidal or sinusoidal.

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