Experimental determination and numerical simulation of material and damage behaviour of 3D printed polyamide 12 under quasi-static loading

Schob, Daniela; Roszak, Robert; Sagradov, Ilja; Sparr, Holger; Ziegenhorn, Matthias; Kupsch, Andreas; Léonard, Fabien; Müller, Bernd R.; Bruno, Giovanni

doi:10.24423/aom.3162

Cited by 4 publications

(6 citation statements)

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“…Given the current lack of standardized testing procedures for AM polymers under shear loading [ 19 ], the testing geometry was chosen in line with the ASTM B831 standard [ 35 ], as illustrated in Figure 1 a. Based on prior research, it has been observed that the resultant material properties demonstrate only minimal dependence on the printing direction [ 15 ]. Therefore, all subsequent tests were performed on specimens layered along the z -axis, Figure 1 b.…”

Section: Methodsmentioning

confidence: 99%

“…Previous investigations have shown that SLS PA12 behaves viscoplastically [ 15 ]. This study focuses on the development of material-specific adjustments of the Chaboche material model, with limitations set on purely isothermal conditions.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…In order to utilise the full potential of SLS PA12, a thorough understanding of the material properties under a wide range of loading conditions is essential. In recent years, studies have been conducted on the material behaviour of SLS PA12 under both quasi-static and cyclic loading [ 14 , 15 , 16 , 17 , 18 ]. Due to the lack of comprehensive standards in the field of AM, the procurement and interpretation of material data remain difficult [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…These microstructural features in combination with the described complex material properties pose challenges for numerical modelling. In the work of [ 15 , 16 ], the material model of Chaboche [ 31 ] was coupled with the damage model of Gurson–Tvergaard–Needleman [ 32 ], and a high accuracy between experiment and simulation was achieved. The GTN model does not take shear stress into account.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterization and Simulation of Shear-Induced Damage in Selective-Laser-Sintered Polyamide 12

Schob,

Richter,

Kotecki

et al. 2023

Materials

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This paper presents the characterisation of selective-laser-sintered (SLS) samples of polyamide 12 (PA12) under shear loading. PA12 is a semi-crystalline thermoplastic and is used in various industries. Its behaviour under shear stress, which is particularly important for product reliability, has not yet been sufficiently investigated. This research focuses on understanding the material and damage behaviour of PA12 under shear-induced stress conditions. The study included quasi-static experiments and numerical simulations. Samples were prepared via SLS and tested according to ASTM standards. Digital image correlation (DIC) was used for precise deformation measurements. The Chaboche material model was used for the viscoplastic behaviour in the numerical simulations. Due to existing material discontinuities in the form of voids, the material model was coupled with the Gurson–Tvergaard–Needleman (GTN) damage model. A modified approach of the GTN model was used to account for low stress triaxiality under shear loading. These models were implemented in MATLAB and integrated into Abaqus via a User Material (UMAT) subroutine. The results of the experiments and simulations showed a high degree of accuracy. An important finding was the significant influence of the shear factor kw on the damage behaviour, especially during failure. This factor proved to be essential for the accurate prediction of material behaviour under shear-induced stress conditions. The integration of the modified GTN model with the Chaboche material model in UMAT enables an accurate prediction of the material and damage behaviour and thus makes an important contribution to the understanding of the mechanical material behaviour of SLS PA12 specimens.

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Section: Methodsmentioning

confidence: 99%

Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization and Simulation of Shear-Induced Damage in Selective-Laser-Sintered Polyamide 12

Schob,

Richter,

Kotecki

et al. 2023

Materials

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“…Such quantity has been introduced by Fensch-Kleemann et al [ 21 ] to quantify laboratory-based XR topography [ 11 ] results (i.e., 2D scans of the specimen). In this laboratory set-up, the refracted beam portions (see e.g., [ 22 , 23 , 24 , 25 ]) deviating from a well-collimated primary beam (collimation of the Kratky type [ 26 ]) are collected in a fixed angular range. The C m can be calculated by normalizing the intensity of the refracted X-rays with the corresponding absorption effects.…”

Section: Diffraction Enhanced Imagingmentioning

confidence: 99%

Diffraction Enhanced Imaging Analysis with Pseudo-Voigt Fit Function

et al. 2022

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Diffraction enhanced imaging (DEI) is an advanced digital radiographic imaging technique employing the refraction of X-rays to contrast internal interfaces. This study aims to qualitatively and quantitatively evaluate images acquired using this technique and to assess how different fitting functions to the typical rocking curves (RCs) influence the quality of the images. RCs are obtained for every image pixel. This allows the separate determination of the absorption and the refraction properties of the material in a position-sensitive manner. Comparison of various types of fitting functions reveals that the Pseudo-Voigt (PsdV) function is best suited to fit typical RCs. A robust algorithm was developed in the Python programming language, which reliably extracts the physically meaningful information from each pixel of the image. We demonstrate the potential of the algorithm with two specimens: a silicone gel specimen that has well-defined interfaces, and an additively manufactured polycarbonate specimen.

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Applications of Viscoplasticity and Damage Models, the Thermomechanical Consistency and the Prospect of a Microstructural Representation

Ziegenhorn

Adelung²,

Franke

et al. 2022

Material Modeling and Structural Mechanics

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Experimental determination and numerical simulation of material and damage behaviour of 3D printed polyamide 12 under quasi-static loading

Cited by 4 publications

References 0 publications

Characterization and Simulation of Shear-Induced Damage in Selective-Laser-Sintered Polyamide 12

Characterization and Simulation of Shear-Induced Damage in Selective-Laser-Sintered Polyamide 12

Diffraction Enhanced Imaging Analysis with Pseudo-Voigt Fit Function

Applications of Viscoplasticity and Damage Models, the Thermomechanical Consistency and the Prospect of a Microstructural Representation

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