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

PDF Url : AD0873990

Report Date : Jun 1970

Pagination or Media Count : 23

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-reinforced 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.

Descriptors :   *REINFORCED PLASTICS, DAMPING, GLASS TEXTILES, INTERNAL FRICTION, STRAIN(MECHANICS), TEST METHODS, VIBRATION

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE