Material Characterization of AISI 316L Flexure Pivot Bearings Fabricated by Additive Manufacturing

Riede, Mirko; Knoll, Matthias; Wilsnack, Christoph; Gruber, Samira; Cubillo, Alba Alegre; Melzer, Christian; Brandão, Ana D.; Pambaguian, Laurent; Seidel, André; López, Elena; Brueckner, Frank; Leyens, Christoph

doi:10.3390/ma12152426

Cited by 12 publications

(6 citation statements)

References 20 publications

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“…When comparing the simulated results with the experimental measurements of the maximum tip deflection, an excellent agreement was observed. Note that the modulus of elasticity of the deposit is taken to be slightly lower than that of the substrate due to the porosities and phase change during solidification (E deposit = 175 GPa and E substrate = 200 GPa) [13,23].…”

Section: Experimental Validationmentioning

confidence: 99%

Reduced order modeling of selective laser melting: from calibration to parametric part distortion

Ghnatios

Hascoët

et al. 2021

Int J Mater Form

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Additive manufacturing is an appealing solution to produce geometrically complex parts, difficult to manufacture using traditional technologies. The extreme process conditions, in particular the high temperature, complex interactions and couplings, and rich metallurgical transformations that this process entails, are at the origin of numerous process defects. Therefore, the numerical simulation of the process is gaining the interest of both the scientific and the industrial communities. However, simulating that process demands impressive computational resources, limiting high resolution simulations to the microscopic and mesoscopic scales. This paper proposes a thermo-mechanical modeling framework at the process scale as well as its associated reduced order simulation counterpart, enabling the parametric evaluation of the part distortion. It deeply addresses the process calibration using a high-resolution computational procedure based on the use of an in-plane-out-of-plane separated representation at the heart of the so-called Proper Generalized Decomposition (PGD), as well as the analysis of the transient thermal effects, defining the conditions in which the thermal and mechanical analyses can be decoupled.

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Section: Experimental Validationmentioning

confidence: 99%

Reduced order modeling of selective laser melting: from calibration to parametric part distortion

Ghnatios

Hascoët

et al. 2021

Int J Mater Form

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“…The results are presented in Table 6 . According to Riede et al [ 29 ], an aspect ratio between 0.3 and 0.5 is recommended to ensure accuracy and high build-up rates during multi-layer manufacturing. For pre-alloyed powder processing and in situ synthesis parameters for achieving an aspect ratio of approx.…”

Section: Resultsmentioning

confidence: 99%

Additive Manufacturing of β-NiAl by Means of Laser Metal Deposition of Pre-Alloyed and Elemental Powders

et al. 2021

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The additive manufacturing (AM) technique, laser metal deposition (LMD), combines the advantages of near net shape manufacturing, tailored thermal process conditions and in situ alloy modification. This makes LMD a promising approach for the processing of advanced materials, such as intermetallics. Additionally, LMD allows the composition of a powder blend to be modified in situ. Hence, alloying and material build-up can be achieved simultaneously. Within this contribution, AM processing of the promising high-temperature material β-NiAl, by means of LMD, with elemental powder blends, as well as with pre-alloyed powders, was presented. The investigations showed that by applying a preheating temperature of 1100 °C, β-NiAl could be processed without cracking. Additionally, by using pre-alloyed, as well as elemental powders, a single phase β-NiAl microstructure can be achieved in multi-layer build-ups. Major differences between the approaches were found within substrate near regions. For in situ alloying of Ni and Al, these regions are characterized by an inhomogeneous elemental distribution in a layerwise manner. However, due to the remelting of preceding layers during deposition, a homogenization can be observed, leading to a single-phase structure. This shows the potential of high temperature preheating and in situ alloying to push the development of new high temperature materials for AM.

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“…Yet, it is noted that mechanical performances of the work pieces fabricated by the plastics materials-based AM processes are not satisfied, and they in turn limit further performance enhancement of the compliant nanopositioner. Hence, 3D printing with metal materials is utilized to enhance the mechanical performance of the work piece [25]. For example, in [26], a flexure hinge with comb-like passive damping structure is fabricated by the selective laser sintering of stainless steel 316L for suppressing the vibration, which is further tuned through filling damping materials.…”

Section: Introductionmentioning

confidence: 99%

Design, fabrication and implementation of a high-performance compliant nanopositioner via 3D printing with continuous fiber-reinforced composite

Cui¹,

Shang²,

Jiang³

et al. 2021

J. Micromech. Microeng.

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Nanopositioning systems have been widely applied in scientific and emerging industrial applications. With simplicity in design and operation, flexure bearings with spatial constraints and voice coil based nano-actuators are considered in designing compliant compact nanopositioning systems. To achieve nano-metric positioning quality, monolithic fabrication of the positioner is preferred, which calls for 3D printing fabrication. However, conventional plastic material-based 3D printing suffers from low mechanical performances, and it is challenging to monolithically fabricate 3D compliant mechanisms with high mechanical performances. Here, we study the fabrication of continuous carbon fiber reinforced composites by 3D printing of the double parallelogram flexure beam structures for spatial constrained nanopositioner with enhanced vertical stiffness. Also, with the consideration of the beam structure design, the process parameters for embedding the carbon fibers are optimized to enhance the beam strengths. Experimental results demonstrate a significant performance improvement with the composite based nanopositioner in both stiffness and natural frequency, and its positioning resolution of 30 nm is achieved. The result of this study will serve as the building block to apply advanced 3D printing of composite structure for precision engineering in the presence of more complex spatial structures.

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Material Characterization of AISI 316L Flexure Pivot Bearings Fabricated by Additive Manufacturing

Cited by 12 publications

References 20 publications

Reduced order modeling of selective laser melting: from calibration to parametric part distortion

Reduced order modeling of selective laser melting: from calibration to parametric part distortion

Additive Manufacturing of β-NiAl by Means of Laser Metal Deposition of Pre-Alloyed and Elemental Powders

Design, fabrication and implementation of a high-performance compliant nanopositioner via 3D printing with continuous fiber-reinforced composite

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