Numerical Analysis of Residual Stress in Resin-Molded Products:2nd Report, Orthotropic Visco-Elastic Analysis of Residual Stress in FRP Structures

To simulate the stress and deformation during the cooling process of fiber-reinforced-plastic(FRP)structures, a finite element method(FEM)to evaluate residual stress and deformation, which occur by cooling after curing of FRP products, has developed. In this method, orthotropic visco-elastic behavio...

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Published inTransactions of the Japan Society of Mechanical Engineers Series A Vol. 66; no. 652; pp. 2122 - 2127
Main Authors SASAKI, Koji, SAITO, Naoto, AMAGI, Shigeo, TSUNODA, Tomoya
Format Journal Article
LanguageJapanese
Published The Japan Society of Mechanical Engineers 25.12.2000
Subjects
Anisotropy
Constitutive Equation
Finite Element Method
Pre-Preg
Reinforced Plastics
Residual Stress
Structural Analysis
Visco Elasticity
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Summary:To simulate the stress and deformation during the cooling process of fiber-reinforced-plastic(FRP)structures, a finite element method(FEM)to evaluate residual stress and deformation, which occur by cooling after curing of FRP products, has developed. In this method, orthotropic visco-elastic behaviors measured by creep tests at several temperatures were simply approximated with an exponential function and orthotropic parameters. The relaxation modulus approximated with the exponential function describes the visco-elasticity and the orthotropic parameters describe the orthotropy caused by fibers in the FRP. To confirm the performance of the FEM program, the residual stress and defomation of a coil caoted by epoxy GFRP(glass FRP)pre-preg during cooling were simulated with this program. And it is shown that this simulated residual stress agrees well with the experimentally measured stress.
ISSN:0387-5008
1884-8338
DOI:10.1299/kikaia.66.2122