Patent ID: 8543363
Filing Date: 2013-09-24
Classification: G06F

Abstract:
1. A method for predicting volume change of void in a resin material or a resin material filled in a porous body arranged in contact with a solid member, the void being a space in the resin material formed by gas generated from the solid member during rising of temperature, the method comprising: (a) taking in a configuration of the porous body in which the resin material is filled, a special configuration in which the resin material is filled in contact with the porous body, and data regarding the solid member in contact with a flow region of the resin from a storage device to a computing device, and performing a dissolving process for dissolving the same into three-dimensional solid elements based on the data; (b) entering properties including at least a density, a thermal conductivity, a specific heat and a viscosity of the resin material, an aperture ratio of the porous body, across-sectional specific resistance of the porous body, a density, a specific heat and a thermal conductivity of the porous body, and boundary conditions comprising an initial temperature of the solid member and the resin material, and a temperature change of the solid member; (c) entering a time variation of volume of a single gas or a total value of volume of a plurality of gases and a specific heat of the single or the plurality of gases generated from the solid member, the porous body or the resin material in response to the temperature change of the solid member, the porous body or the resin material; (d) computing an equation of continuity, a Navier-Stokes equation and an energy conservation equation based on the three-dimensional solid elements to thereby calculate the change of resin temperature, calculate the change of viscosity accompanying the change of temperature of the resin material, calculate a function including the cross-sectional specific resistance and the viscosity as a flow resistance factor of the porous body, and enter to the Navier-Stokes equation a product of the flow resistance factor of the porous body and the flow rate and density of the resin as an external force per unit volume of the porous body via fluid resistance; (e) entering a void volume change by the gas generated from the solid member, the porous body or the resin material, an initial void dimension and an initial time increment regarding an analysis of a flow process of the resin, and calculating the equation of continuity, the Navier-Stokes equation and the energy conservation equation based on the three-dimensional solid elements to thereby compute contents including the change of volume of the void by the generation of gas and the inner pressure of the void; (f) in the initial time increment of resin flow analysis (first step), (g) in a subsequent time increment (second step), (h) repeating the calculation having added the time increment until the time reaches a predetermined time and thereby calculating at least the change in void volume due to the generation of gas.