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Proceedings Paper

Direct complex stiffness test system for viscoelastic material properties
Author(s): Bradley R. Allen
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Paper Abstract

A test system designed specifically to acquire the complex moduli of viscoelastic materials in shear is described. Unique and innovative approaches in the mechanical design, temperature control system, and data acquisition methods provide a standard of accuracy that is rarely seen in dynamic mechanical properties of viscoelastic materials. The system operates on the principle of direct complex stiffness measurements. Unique sensors, hardware layout, and data acquisition and reduction methods maximize the frequency bandwidth and the dynamic range of stiffness, data acquisition speed, and temperature uniformity. Forced liquid convection temperature control also provides unparalleled speed and uniformity in specimen temperatures. Results are demonstrated and scrutinized using characterization software. Characterized data are stored in a database that provides the designer with the capability of searching based on the mechanical parameters commonly needed for damping designs. The end product is an end-to- end system capable of superior data accuracy and acquisition rates, and software that enables the most critical evaluation of results and ready storage in a manner that is efficient for damping design applications.

Paper Details

Date Published: 1 May 1996
PDF: 8 pages
Proc. SPIE 2720, Smart Structures and Materials 1996: Passive Damping and Isolation, (1 May 1996); doi: 10.1117/12.239101
Show Author Affiliations
Bradley R. Allen, CSA Engineering, Inc. (United States)

Published in SPIE Proceedings Vol. 2720:
Smart Structures and Materials 1996: Passive Damping and Isolation
Conor D. Johnson, Editor(s)

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