Viscoelastic Behavior of a Nonlinear Fiber-Reinforced Plastic.
Abstract
The nonlinear, viscoelastic behavior of a unidirectional, glass fiber-epoxycomposite material is characterized by using isothermal, uniaxial creep, andrecovery tests together with a constitutive equation based on a thermo-dynamictheory. Linear stress-strain equations for both uniaxial and multiaxialloading of orthotropic materials are reviewed, and then the non- inearconstitutive equation for uniaxial loading is given. The creep complianceobeys a power law in time with the exponent being independent of fiberorientation and stress level, and the nonlinear properties depend mainly onthe average octahedral shear stress in the matrix. These properties are usedto make various predictions of viscoelastic behavior, and good agreement withthe experimental data is found. A limited study of the effect of temperatureon creep is made. (Author, modified-PL)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1970
- Accession Number
- AD0718978
Entities
People
- R. A. Schapery
- Yuequn Lou
Organizations
- Purdue Research Foundation