Casting simulation method

A casting simulation method capable of expressing influence of different inelastic strains produced at different temperatures on work hardening, namely on increase in yield stress, at room temperature, the influence varying with differences in recovery at the different temperatures, by introducing an amount of effective equivalent inelastic strain to an elasto-plastic constitutive equation and/or an elasto-viscoplastic constitutive equation in which an amount of equivalent inelastic strain is used as a degree of work hardening, namely an amount of increase in yield stress, such as an elasto-plastic constitutive equation in which a yield function is expressed as f=f(σeff,εeffp,T) or an elasto-viscoplastic constitutive equation in which a relation between equivalent stress, equivalent viscoplastic strain, viscoplastic strain rate, and temperature is expressed as σeff.=F(εeff.vp,{dot over (ε)}eff.vp,T), wherein

• an amount of effective equivalent inelastic strain εeffective inelastic obtained by Eq. (1) below is used:
• the amount of effective equivalent inelastic strain εeffective inelastic=∫ot{h(T)/h(RT)}{(Δεinelastic/Δt)}dt (1)
• , where
• T denotes a temperature with inelastic strain,
• h(T) denotes an increment of yield strength at room temperature with respect to an amount of inelastic strain at the temperature with inelastic strain,
• h(RT) denotes an increment of yield strength at room temperature with respect to an amount of inelastic strain applied at room temperature,
• h(T)/h(RT) denotes an effective inelastic strain coefficient α(T),
• Δεinelastic/Δt denotes an equivalent inelastic strain rate, and
• t denotes a time from 0 second in analysis.