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