Improvement and Optimization of Internal Damping of Fiber Reinforced Composite Materials
Abstract
Analysis of material damping and optimization of both material damping and specific stiffness of laminated, continuous or discontinuous fiber reinforced polymer matrix is the major objective of this study. The analytical solution was achieved by using a force-balanced model to derive the equivalent modulus of unidirectional aligned short fiber composites. We then apply the elastic-viscoelastic correspondence principle and separating the real and imaginary parts to obtain the storage and the loss moduli of the composite. In laminated composites we also investigate the influence of interlaminar stress on damping. To this end, we use a finite-element program to evaluate the three- dimensional stress distribution in the plane of each lamina and also at each interface. We then formulate the total strain energy and apply the elastic- viscoelastic correspondence principle to obtain the analytical expression of damping of laminated composites, which is defined as the ratio of the energy dissipated per cycle and the total energy. Analytical results are compared with those obtained from classical two-dimensional lamination theory. Sequential Simplex method, laminated plate theory, and an elastic-viscoelastic correspondence principle are used to optimize both material damping and a specific stiffness of composites.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 17, 1985
- Accession Number
- ADA166173
Entities
People
- C. T. Sun
Organizations
- University of Florida