Accession Number : AD0873990
Title : Development of Test Methods for Measuring Damping of Fiber-Reinforced Materials.
Descriptive Note : Final rept.,
Corporate Author : ARMY AVIATION MATERIEL LABS FORT EUSTIS VA
Personal Author(s) : Gustafson, A. J. ; Mazza, L. Thomas ; Rodgers, Robert L. ; McIlwean, Edgar H.
Report Date : JUN 1970
Pagination or Media Count : 24
Abstract : The objective of this work was to develop a test method, or methods, for the measurement of damping of fiber-reinforced plastics. Damping is a measure of the energy loss of a material subjected to cyclic strain. This parameter has a major effect on the mechanical behavior of dynamically loaded structures. A number of test methods were reviewed for applicability to testing fiber- reinforeced plastics. Two methods were selected: free-free vibration and forced vibration, both using a thin beam in transverse vibration. The free-free method given better accuracy, and the forced vibration method allows measurement of damping at various stress levels. (Author, modified-PL)
Descriptors : (*REINFORCED PLASTICS, DAMPING), INTERNAL FRICTION, TEST METHODS, STRAIN(MECHANICS), VIBRATION, GLASS TEXTILES.
Subject Categories : Laminates and Composite Materials
Distribution Statement : APPROVED FOR PUBLIC RELEASE