This test method measures the loss factor and the equivalent bending rigidity modulus of composites, drywall, plywood and similar building elements. The aim is to compare the damping properties of building elements and others such as density and thickness as can be related to the sound transmission loss of the element itself.
ASTM E756 can be used to measure the dynamic properties of damping materials and viscoelastic inner layers. This standard is required to be able to measure complete building elements that incorporate damping materials. These kinds materials are often relatively thick and sometimes have compliant core materials which are very difficult to support in a clamped cantilever device. Measuring the dynamic properties of complete composites allows the measurement of the variability inherent in the manufacturing process as well as the performance of the damping materials.The properties derived from the materials can be used to predict the sound transmission loss thus allowing consultants and engineers to predict the sound transmission loss performance of a wall incorporating these materials.
Keywordsdamping; sound transmission loss; dynamic bending stiffness;composites; plywood; drywall
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top