Effects of radiation and creep on viscoelastic damping materials

John P. Henderson; Tom M. Lewis; Fred H. Murrell; Danny Mangra

doi:10.1117/12.208895

5 May 1995 Effects of radiation and creep on viscoelastic damping materials

John P. Henderson, Tom M. Lewis, Fred H. Murrell, Danny Mangra

Proceedings Volume 2445, Smart Structures and Materials 1995: Passive Damping; (1995) https://doi.org/10.1117/12.208895
Event: Smart Structures and Materials '95, 1995, San Diego, CA, United States

Abstract

The Advanced Photon Source (APS), under construction at Argonne National Laboratory (ANL), requires precise alignment of several large magnets. Submicron vibratory displacements of the magnets can degrade the performance of this important facility. Viscoelastic materials (VEM) have been shown to be effective in the control of the vibration of these magnets. Damping pads, placed under the magnet support structures in the APS storage ring, use thin layers of VEM. These soft VEM layers are subject to both high-energy radiation environment and continuous through-the-thickness compressive loads. Material experiments were conducted to answer concerns over the long term effects of the radiation environment and creep in the viscoelastic damping layers. The effects of exposure to radiation as high as 10⁸ rad on the complex modulus were measured. Through-the-thickness creep displacements of VEM thin layers subjected to static loads of 50 psi were measured. Creep tests were conducted at elevated temperatures. Time-temperature equivalence principles were used to project creep displacements at room temperatures over several years. These damping material measurements should be of interest to vibration control engineers working with a variety of applications of fields ranging from aerospace to industrial machinery.

Citation Download Citation

John P. Henderson, Tom M. Lewis, Fred H. Murrell, and Danny Mangra "Effects of radiation and creep on viscoelastic damping materials", Proc. SPIE 2445, Smart Structures and Materials 1995: Passive Damping, (5 May 1995); https://doi.org/10.1117/12.208895

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