Material point simulations as a basis for determining Johnson–Cook hardening parameters via instrumented scratch tests

Leroch, Sabine; Eder, Stefan J.; Varga, M.; Ripoll, Manel Rodríguez

doi:10.1016/j.ijsolstr.2023.112146

Cited by 7 publications

(2 citation statements)

References 43 publications

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“…Multiplying the number of chip particles with the per-particle volume yields the chip volume, which may be evaluated as a function of grinding distance, so that its slope gives us the material removal rate (MRR) as removed material volume per unit grinding distance. The topography of the work piece without the chip is then analyzed by superimposing a quadratic lateral mesh with a size slightly above the nominal MPM particle distance to reduce aliasing artifacts, as previously done in (Leroch et al, 2022). Within each mesh element, the z-coordinate of the highest MPM particle plus its particle radius constitutes the surface of that element, allowing the production of topographic maps, the calculation of roughness parameters such as S q , which is equivalent to the root-mean-square (RMS) value of the topographic heights, as well as the evaluation of median grinding groove cross-sections equivalent to what is common practice in scratch testing.…”

Section: Evaluation Of the Simulationsmentioning

confidence: 99%

Towards a multi-abrasive grinding model for the material point method

Leroch

Grützmacher²,

Heckes

et al. 2023

Front. Manuf. Technol.

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An efficient optimization of surface finishing processes can save high amounts of energy and resources. Because of the large occurring deformations, grinding processes are notoriously difficult to model using standard (mesh-based) micro-scale modeling techniques. In this work, we use the meshless material point method to study the influence of abrasive shape, orientation, rake angle, and infeed depth on the grinding result. We discuss the chip morphology, the surface topography, cutting versus plowing mode, the material removal rate, and the chip temperature. A generalization of our model from a straightforward single-abrasive approach to a multiple-abrasive simulation with pseudo-periodical boundary conditions greatly increases the degree of realism and lays the foundation for comparison with real finishing processes. We finally compare our results for multiple abrasives to those obtained for a scaled-down molecular dynamics system and discuss similarities and differences.

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Section: Evaluation Of the Simulationsmentioning

confidence: 99%

Towards a multi-abrasive grinding model for the material point method

Leroch

Grützmacher²,

Heckes

et al. 2023

Front. Manuf. Technol.

View full text Add to dashboard Cite

show abstract

“…In a recent study [32], scratch tests were used to determine the Johnson-Cook (JC) plasticity model parameters. A range of model parameters were simulated extensively to generate parameter maps, which can be used for determining the yield stress or hardening modulus, as a function of geometric scratch characteristics.…”

Section: Introductionmentioning

confidence: 99%