Accession Number : ADA300521

Title :   Experimental Estimation of Process Parameters in Resin Transfer Molding.

Descriptive Note : Technical rept.,

Corporate Author : MINNESOTA UNIV MINNEAPOLIS DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Duh, Robert J. ; Maier, Robert S. ; Vogel, Jeffrey H.

PDF Url : ADA300521

Report Date : 14 JUN 1995

Pagination or Media Count : 14

Abstract : A numerical method is presented for the estimation of experimental resin transfer molding (RTM) process parameters from in-mold temperature data. The approach is built around the simulation of either radial or axial flow of reactive resins through a fiber preform inside a mold cavity. The simulation considers a non-isothermal environment, with one-dimensional flow and one-dimensional heat transfer, and allows for either pressure or flow rate controlled inlet conditions. Based on the observed temperature history at a selected point in the mold the best fit values of the unknown process parameters are obtained by minimizing the difference between the simulated and experimental temperature histories. This minimization is accomplished by integrating the simulation model with a MINPACK nonlinear least-squares routine (1). As an example, the chemical kinetic parameters for a step-wise polyurethane reaction are estimated based on temperature data reported by Gonzalez (2). Simulated temperature histories using the parameter values obtained agree very well with experimental results.

Descriptors :   *COMPOSITE MATERIALS, *POLYURETHANE RESINS, *MOLDING TECHNIQUES, HEAT TRANSFER, FIBERS, REACTION KINETICS, POLYMERS, POLYMERIZATION, FIBER REINFORCED COMPOSITES, FLOW RATE, LEAST SQUARES METHOD, INCOMPRESSIBLE FLOW.

Subject Categories : Laminates and Composite Materials
      Plastics
      Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE