Thermomechanical simulation of the selective laser melting process for PA12 including volumetric shrinkage

Riedlbauer, Daniel; Steinmann, Paul; Mergheim, Julia

doi:10.1063/1.4918512

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…according to conservation of mass. As the volume and mass fractions can be converted into one another, compare (37), the following framework is derived based on volume fractions ξ • . This enables the enforcement of the minimisation based on the Helmholtz free energy ψ without weighting the equation itself with the respective mass density ρ • .…”

Section: Evolution Equationsmentioning

confidence: 99%

“…Over the last twenty years, starting with [44], different approaches for simulations using the Finite Element (FE) method have been available in literature regarding the modelling of the SLM process on a small scale: purely thermal models, see for example [12,15,26,29,30,38,42,45] and more sophisticated thermomechanical small strain models, i.e. [11,16,22,36,37,43,49,51]. Thermomechanical models enable the prediction of residual stresses and the geometry, as well as the influence on scanning strategies.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of volume shrinkage of the powder bed due to porosity has been investigated in [12] by using a purely thermal model. In [16,37] a thermomechanical model is used, where a pseudo-thermal expansion is implemented to take into account not only the thermal expansion of the material, but also the shrinkage of the powder bed. The advantage of a thermomechanical model and the difference in the temperature evolution is also stated in [16].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A computational phase transformation model for selective laser melting processes

2020

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Selective laser melting (SLM) has gained large interest due to advanced manufacturing possibilities. However, the growing potential also necessitates reliable predictions of structures in particular regarding their long-term behaviour. The constitutive and structural response is thereby challenging to reproduce, due to the complex material behaviour. This motivates the aims of this contribution: To establish a material model that accounts for the behaviour of the different phases occurring during SLM but that still allows the use of (basic) process simulations. In particular, the present modelling framework explicitly takes into account the mass fractions of the different phases, their mass densities, and specific inelastic strain contributions. The thermomechanically fully coupled framework is implemented into the software Abaqus. The numerical examples emphasise the capabilities of the framework to predict, e.g., the residual stresses occurring in the final part. Furthermore, a postprocessing of averaged inelastic strains is presented yielding a micromechanics-based motivation for inherent strains.

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Section: Evolution Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A computational phase transformation model for selective laser melting processes

2020

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HelixJet: An innovative plasma source for next‐generation additive manufacturing (3D printing)

Schäfer

Quade

Abrams

et al. 2019

Plasma Processes & Polymers

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A novel plasma source (HelixJet) for use in additive manufacturing (AM)/3D printing is proposed. The HelixJet is a capacitively coupled radio frequency plasma with a double‐helix electrode configuration that generates a surprisingly stable and homogeneous glow plasma at low flow rates of argon and its mixtures at atmospheric pressure. The HelixJet was tested on three polyamide powders usually used to produce parts by laser sintering, a powder‐based AM process, to form local deposits. The chemical composition of such plasma‐printed samples is compared with thermally produced and laser‐sintered samples with respect to differences in morphology that result from the different thermal cycles on several length scales. Plasma prints exhibit unique features attributable to the nonequilibrium chemistry and to the high‐speed heat exchange.

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A macroscale FEM-based approach for selective laser sintering of thermoplastics

Ganci

Zhu

Buffa

et al. 2017

Int J Adv Manuf Technol

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Thermomechanical simulation of the selective laser melting process for PA12 including volumetric shrinkage

Cited by 6 publications

References 10 publications

A computational phase transformation model for selective laser melting processes

A computational phase transformation model for selective laser melting processes

HelixJet: An innovative plasma source for next‐generation additive manufacturing (3D printing)

A macroscale FEM-based approach for selective laser sintering of thermoplastics

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