Residual stress via the contour method in compact tension specimens produced via selective laser melting

Vrancken, Bey; Cain, Victoria; Knutsen, R.D.; Humbeeck, Jan Van

doi:10.1016/j.scriptamat.2014.05.016

Cited by 222 publications

(94 citation statements)

References 18 publications

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“…Furthermore, they observed that building direction has much less influence on the uniaxial tensile properties of the material. Their results were confirmed by Vrancken et al [9], who showed that the residual stress inside samples is mainly oriented along the building direction, significantly affecting the fracture behavior during fracture toughness tests.…”

Section: Introductionmentioning

confidence: 52%

Fracture mechanics of laser sintered cracked polyamide for a new method to induce cracks by additive manufacturing

et al. 2016

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This paper presents an experimental investigation on specimens manufactured by Selective Laser Sintering (SLS), with the purposes of giving designers advice when designing 3D printed parts, and laying the basis for a step forward in the field of fracture mechanics of 3D complex parts.The aim is to investigate the effect of building direction in Polyamide (PA) 3D printed samples and to assess whether a crack can be initiated directly from the sintering process for fracture mechanics study purposes.Six different configurations of Mode I Compact Tension (CT) specimens were manufactured and tested; the experiments were monitored by Digital Image Correlation (DIC) and fractured surfaces were analyzed using microscopy.Results showed that samples with better mechanical performance are those in which all the layers contain a portion of the crack. On the other hand, those with layers parallel to the crack plan offer a preferential pathway for the crack to propagate. DIC and fractography investigations showed that, under certain conditions, small-radius geometries, or too-close surfaces may glue depending on printer resolution. Experiments also showed that SLS is capable of printing specimens with internal cracks that can be used to study fracture mechanics of complex parts or parts with internal cracks.

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Section: Introductionmentioning

confidence: 52%

Fracture mechanics of laser sintered cracked polyamide for a new method to induce cracks by additive manufacturing

et al. 2016

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“…First principles models, both simple and complex, were proposed by Patterson et al [35,36] and Fergani et al [61], all of which were demonstrated and verified using various numerical experiments and comparisons to published experimental data. Examples of computational studies that were verified using various simple part deformation experiments were those performed by Vrancken et al [62], Zinovieva et al [63], Liu et al [64] and Safronov et al [65]. Stress models built using ANSYS include those models developed by Zaeh and Branner [66] and Gu and He [67].…”

Section: Stress and Distortion Modelsmentioning

confidence: 99%

Overhanging Features and the SLM/DMLS Residual Stresses Problem: Review and Future Research Need

2017

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Abstract:A useful and increasingly common additive manufacturing (AM) process is the selective laser melting (SLM) or direct metal laser sintering (DMLS) process. SLM/DMLS can produce full-density metal parts from difficult materials, but it tends to suffer from severe residual stresses introduced during processing. This limits the usefulness and applicability of the process, particularly in the fabrication of parts with delicate overhanging and protruding features. The purpose of this study was to examine the current insight and progress made toward understanding and eliminating the problem in overhanging and protruding structures. To accomplish this, a survey of the literature was undertaken, focusing on process modeling (general, heat transfer, stress and distortion and material models), direct process control (input and environmental control, hardware-in-the-loop monitoring, parameter optimization and post-processing), experiment development (methods for evaluation, optical and mechanical process monitoring, imaging and design-of-experiments), support structure optimization and overhang feature design; approximately 143 published works were examined. The major findings of this study were that a small minority of the literature on SLM/DMLS deals explicitly with the overhanging stress problem, but some fundamental work has been done on the problem. Implications, needs and potential future research directions are discussed in-depth in light of the present review.

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“…First principles models, both simple and complex, were proposed by Patterson et al [35][36] and Fergani et al [61], all of which were demonstrated and verified using various numerical experiments and comparisons to published experimental data. Examples of computational studies that were verified using various simple part deformation experiments were those performed by Vrancken et al [62] [71] were multiscale finite element models for fast and efficient prediction of part distortion, primarily intended to inform part designers and engineers.…”

Section: Stress and Distortion Modelsmentioning

confidence: 99%

Overhanging Features and the SLM/DMLS Residual Stresses Problem: Review and Future Research Need

Patterson¹,

Messimer²,

Farrington³

2017

Preprint

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A useful and increasingly common additive manufacturing (AM) process is the selective laser melting (SLM) or direct metal laser sintering (DMLS) process. SLM/DMLS can produce fulldensity metal parts from difficult materials, but it tends to suffer from severe residual stresses introduced during processing. This limits the usefulness and applicability of the process, particularly in the fabrication of parts with delicate overhanging and protruding features. The purpose of this study was to examine the current insight and progress made toward understanding and eliminating the problem in overhanging and protruding structures. To accomplish this, a survey of literature was undertaken, focusing on process modeling (general, heat transfer, stress and distortion, and material models), direct process control (input and environmental control, hardware-in-the-loop monitoring, parameter optimization, and post-processing), experiment development (methods for evaluation, optical and mechanical process monitoring, imaging, and design-of-experiments), support structure optimization, and overhang feature design; approximately 140 published works were examined. The major findings of this study were that a small minority of the literature on SLM/DMLS deals explicitly with the overhanging stress problem, but some fundamental work has been done on the problem. Implications, needs, and potential future research directions are discussed in-depth in light of the present review.

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Residual stress via the contour method in compact tension specimens produced via selective laser melting

Cited by 222 publications

References 18 publications

Fracture mechanics of laser sintered cracked polyamide for a new method to induce cracks by additive manufacturing

Fracture mechanics of laser sintered cracked polyamide for a new method to induce cracks by additive manufacturing

Overhanging Features and the SLM/DMLS Residual Stresses Problem: Review and Future Research Need

Overhanging Features and the SLM/DMLS Residual Stresses Problem: Review and Future Research Need

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