High-pressure compaction modelling of calcite (CaCO3) powder compact

Modelling the non-linear elastic behaviour and fracture of metal powder compacts

“…This type of model is widely used for simulating powder material behaviour, e.g. simulation of CaCO 3 powder compaction in a Bridgman anvil high pressure apparatus see Berg et al [17]. In this work, the model is fitted to experimental data of the iron based powder used here.…”

High pressure characterization and modelling of CaCO3powder mix in the Bridgman anvil apparatus

“…This was done to evaluate the cap eccentricity value without frictional slip influencing the results. The set-up was the same as Berg et al [14], but it was modified by placing two 8% cobalt carbide discs on the anvil noses, each having a thickness of 4.25 mm, see Figure 4. The carbide discs were sand-blasted for a rough, sticking surface (no slip towards the CaCO 3 discs).…”

“…Utilizing data from experiments such as Brazilian disc test, uniaxial test and closed die test, constitutive models can be obtained and used in numerical analysis. For example, Berg et al [14] simulated the pressing of CaCO 3 in a Bridgman anvil high pressure apparatus [15,16] using the FE method with a user-defined material subroutine. Li et al [17] simulated pressing of pyrophyllite in the cubic anvil-type press [18] using a Drucker-Prager model.…”

“…The purpose of this study was to further evaluate, compare and improve the constitutive model, found in Berg et al [14], and its parameters for a CaCO 3 powder mix. The major problem with the model in Berg et al [14] is that it cannot simulate different starting densities because of a constant cap eccentricity value.…”

“…The major problem with the model in Berg et al [14] is that it cannot simulate different starting densities because of a constant cap eccentricity value. This is accomplished by incorporating a density-dependent cap eccentricity value that was found using inverse modelling and Bridgman anvil tests.…”