Method for analyzing growth of void of resin in a porous material

摘要

The present invention provides a method for analyzing growth of void of resin in a porous material which comprising the steps of inputting data of the shape of a porous material filled with a resin material, and dividing the shape of the porous material into three-dimensional solid elements; inputting physical properties of the porous material, and boundary conditions including a pressure that is applied to the porous material; obtaining a resin-density distribution in the porous material through fluid analysis using a database obtained by experimentally measuring in advance a temporal change in a volume of gas generated from the resin material and porous material during heating, changes in a compressive force and compressive displacement respectively occurring when the porous material impregnated with the resin is compressed, and a change in a flow resistance of the resin; and comprehensively grasping production, growth, and distribution of voids deriving from gas generation.

主权项

1. A method for analyzing growth of a region void of resin in a porous material by using a computer, comprising the steps of:
inputting, into the computer, data of a shape of a porous material filled with a resin material, and dividing, in the computer, the shape of the porous material into three-dimensional finite elements on the basis of the inputted shape data; inputting, into the computer, physical properties of the porous material filled with the resin material, and boundary conditions including a pressure that is applied to the porous material with molds; obtaining a resin-density distribution in the porous material divided into the three-dimensional finite elements, by using a computer-implemented fluid analysis using a database obtained by experimentally measuring, in advance: a temporal change in a volume of gas generated from the resin material and porous material during heating, changes in a compressive force and compressive displacement respectively occurring when the porous material impregnated with the resin is compressed, and a change in a flow resistance of the resin; and comprehensively graphing production, growth, and distribution of voids deriving from gas generation, on the basis of an apparent resin-density distribution in each of the obtained three-dimensional finite elements; wherein the computer-implemented fluid analysis includes the following apparent resin density equation concerning a finite element of the porous material:ρA=ρr-(ρr-ρg)·Vgf⁡(h)·Vm; wherein ρA denotes apparent resin density in a finite element, ρr denotes a density of the resin material, ρg denotes a gas density, and Vg denotes a gas-occupied volume of each finite element, Vm denotes a total volume of the finite element of the porous material, f denotes an aperture ratio of the porous material, and h denotes a compressive displacement of the porous material.