The development of TiNi-based negative Poisson's ratio structure using selective laser melting

Li, Sheng; Hassanin, Hany; Attallah, Moataz M.; Adkins, Nicholas J.E.; Essa, Khamis

doi:10.1016/j.actamat.2015.12.017

Cited by 255 publications

(116 citation statements)

References 36 publications

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“…Excess material accumulation at nodes has been observed by Gümrük et al [68]. Similar results were seen by Li et al [69], where strut diameters increased by approximately 30% around the nodes (from 0.3 mm to amaximumof2mm).Al-Ketanetal. [70]comparedseveralunitcell designs and found nodes to be smoother in surface-based unit cells.…”

Section: Dimensional Inaccuraciessupporting

confidence: 79%

Review of defects in lattice structures manufactured by powder bed fusion

Echeta

Feng

Dutton

et al. 2019

Int J Adv Manuf Technol

148

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Additively manufactured lattice structures are popular due to their desirable properties, such as high specific stiffness and high surface area, and are being explored for several applications including aerospace components, heat exchangers and biomedical implants. The complexity of lattices challenges the fabrication limits of additive manufacturing processes and thus, lattices are particularly prone to manufacturing defects. This paper presents a review of defects in lattice structures produced by powder bed fusion processes. The review focuses on the effects of lattice design on dimensional inaccuracies, surface texture and porosity. The design constraints on lattice structures are also reviewed, as these can help to discourage defect formation. Appropriate process parameters, post-processing techniques and measurement methods are also discussed. The information presented in this paper contributes towards a deeper understanding of defects in lattice structures, aiming to improve the quality and performance of future designs.

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Section: Dimensional Inaccuraciessupporting

confidence: 79%

Review of defects in lattice structures manufactured by powder bed fusion

Echeta

Feng

Dutton

et al. 2019

Int J Adv Manuf Technol

148

View full text Add to dashboard Cite

show abstract

“…The influence of laser process parameters and the build direction on the microstructure and the density of the SLM parts have been investigated by many workers. Parts made by SLM, show microstructural and mechanical properties different from those found in conventionally manufactured parts (Read et al, 2015, Qiu et al, 2015, Mumtaz and Hopkinson, 2009, Wong et al, 2007, Mumtaz and Hopkinson, 2010, Chantarapanich et al, 2014, Simhambhatla and Karunakaran, 2015, Li et al, 2016.…”

Section: Introductionmentioning

confidence: 99%

Net-shape manufacturing using hybrid selective laser melting/hot isostatic pressing

Hassanin

Essa

Qiu

et al. 2017

RPJ

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Purpose: A manufacturing technology using hybrid Selective Laser Melting / Hot Isostatic Pressing (SLM/HIP) process has been developed to produce full density net-shape components more rapidly and at lower cost than processing by SLM alone.Design/methodology/approach: Ti-6Al-4V powder was encapsulated in-situ by the production of as-SLMed shell prior to the HIP process. After HIPping, the SLM shell is an integral part of the final component. Finite element modelling (FE) based on pure plasticity theory of porous metal coupled with an iterative procedure has been adopted to simulateHIPping of the encapsulated Ti-6Al-4V powder and SLMed shell. Two demonstrator parts have been modelled, designed, produced and experimentally validated. Geometrical analysis and microstructural characterisation have been carried out to demonstrate the efficiency of the process.Findings: the FE model is in agreement with the measured data obtained and confirms that the design of the shell affects the resulting deformed parts. In addition, the SEM and EBSD of the interior and exterior parts reveal a considerably different grain structure and crystallographic orientation with a good bonding between the SLMed shell and HIPped powder.Originality/value: An approach to improve SLM productivity by combining it with HIP is developed to further innovate the advanced manufacturing field. The possibility of the hybrid SLS/HIP supported by FEA simulation as a net shape manufacturing process for fabrication of high performance parts has been demonstrated

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“…Li et al. studied the development of shape memory auxetic cellular structures and investigated the role of LPBF process parameters on the as‐fabricated and heat‐treated microstructure and hence the performance of the developed structures . In contrast, Yan et al.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Properties of Additively Manufactured Cellular Structures Using Machine Learning Approaches

et al. 2020

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Cellular structures are lightweight‐engineered materials that have gained much attention with the development of additive manufacturing technologies. This article introduces a precise approach to predict the mechanical properties of additively manufactured lattice structures using deep‐learning approaches. Diamond‐shaped nodal lattice structures are designed by varying strut length, strut diameter, and strut orientation angle. The samples are manufactured using laser powder bed fusion (LPBF) of Ti−64 alloy and subjected to compression testing to measure the ultimate strength, elastic modulus, and specific strength. Machine learning approaches such as shallow neural network (SNN), deep neural network (DNN), and deep learning neural network (DLNN) are developed and compared to the statistical design of experiment (DoE) approach. The trained DLNN model show the highest performance when compared with DNN, DoE, and SNN with a mean percentage error of 5.26%, 14.60%, and 9.39% for the ultimate strength, elastic modulus, and specific strength, respectively. The DLNN model is used to create process maps, and is further validated. The results show that although deep learning is preferred for big data, the optimized DLNN model outperform the statistical DoE approach and can be a favorable tool for lattice structure prediction with limited data.

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The development of TiNi-based negative Poisson's ratio structure using selective laser melting

Cited by 255 publications

References 36 publications

Review of defects in lattice structures manufactured by powder bed fusion

Review of defects in lattice structures manufactured by powder bed fusion

Net-shape manufacturing using hybrid selective laser melting/hot isostatic pressing

Controlling the Properties of Additively Manufactured Cellular Structures Using Machine Learning Approaches

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