A method of supporting design of a resin mold product, where a computer is used to support design of a resin mold product made of thermosetting resin by implementing the operations of:
- a flow analysis step in which a finite difference method or a finite element method is used to analyze a flow of thermosetting resin injected into a resin filling cavity to mold said resin mold product;
- a residual strain calculation step for calculating thermosetting resin's residual strain after heat shrinkage of the thermosetting resin injected into the resin filling cavity to mold said resin mold product;
- and
- a strength analysis step in which a finite element method is used to analyze strength of said resin mold product;
- wherein:
- in said flow analysis step;
- a reaction rate model is indicated by using a reaction rate A;
- wherein A is an index of reaction progress extent whose initial value at the reaction is 0, and the change rate of A (∂A/∂t) in the initial period is relatively high in comparison to a rate during times after the initial period, and the reaction rate A is saturated toward 1 with lapse of time;
- and wherein viscosity η, coefficient of elasticity E, and linear curing strain component ε1 are calculated by replacing the changes of each component with the change of the reaction rate A;
- in said flow analysis step, a temperature, a coefficient of elasticity and a strain component of the thermosetting resin at a time of heat curing are calculated for each of first three-dimensional solid elements used for flow analysis;
- in said residual strain calculation step, correspondence between each of second three-dimensional solid elements used for strength analysis in said strength analysis step and each of said first three-dimensional solid elements, and the temperature, the coefficient of elasticity and the strain component calculated for each of said first three-dimensional solid elements in said flow analysis step are used in order to set a temperature, a coefficient of elasticity and a strain component at the time of heat curing for each of the second three-dimensional solid elements, and residual strain after the heat shrinkage is calculated for each of said second three-dimensional solid elements;
- and
- in said strength analysis step, the residual strain after the heat shrinkage, which is calculated in said residual strain calculation step, is set to said each of said second three-dimensional solid elements, and the strength of said resin mold product is analyzed.