Numerical and experimental validation of a non-standard specimen for uniaxial tensile test

Bergonzi, Lorenzo; Vettori, M.; Pirondi, A.; Moroni, F.; Musiari, F.

doi:10.1016/j.prostr.2018.11.078

Cited by 17 publications

(6 citation statements)

References 6 publications

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“…The mechanical characterization analyses were performed using MaCh5 (MaCh3D SRL, Parma, Italy), a commercial desktop testing machine (load capacity of 5kN and a crosshead run of 110 mm) [ 38 ]. The specimen free trait was considered as base length for strain measurements and, according to ISO 527, it was set to a length of 60 mm between rollers’ contact lines and specimens end-tabs.…”

Section: Methodsmentioning

confidence: 99%

3D Printed Masks for Powders and Viruses Safety Protection Using Food Grade Polymers: Empirical Tests

Foresti

Ghezzi

Vettori³

et al. 2021

Polymers

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The production of 3D printed safety protection devices (SPD) requires particular attention to the material selection and to the evaluation of mechanical resistance, biological safety and surface roughness related to the accumulation of bacteria and viruses. We explored the possibility to adopt additive manufacturing technologies for the production of respirator masks, responding to the sudden demand of SPDs caused by the emergency scenario of the pandemic spread of SARS-COV-2. In this study, we developed different prototypes of masks, exclusively applying basic additive manufacturing technologies like fused deposition modeling (FDM) and droplet-based precision extrusion deposition (db-PED) to common food packaging materials. We analyzed the resulting mechanical characteristics, biological safety (cell adhesion and viability), surface roughness and resistance to dissolution, before and after the cleaning and disinfection phases. We showed that masks 3D printed with home-grade printing equipment have similar performances compared to the industrial-grade ones, and furthermore we obtained a perfect face fit by customizing their shape. Finally, we developed novel approaches to the additive manufacturing post-processing phases essential to assure human safety in the production of 3D printed custom medical devices.

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Section: Methodsmentioning

confidence: 99%

3D Printed Masks for Powders and Viruses Safety Protection Using Food Grade Polymers: Empirical Tests

Foresti

Ghezzi

Vettori³

et al. 2021

Polymers

Self Cite

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“…The machine technology is based on a proprietary shape of the grips that is counter shaped to the head of the specimens, with the advantage of reducing the test execution times, eliminating the degrading effects of traditional grips on the specimen and minimizing operator error by excluding the influence of subjective factors during the test setup 8 . The loads are recorded with a 5‐kN load cell, while the deformation of the specimen is measured with a commercial extensometer, with a measuring base of 50 mm, directly acquired by the MaCh3D system.…”

Section: Methodsmentioning

confidence: 99%

“…The loads are recorded with a 5‐kN load cell, while the deformation of the specimen is measured with a commercial extensometer, with a measuring base of 50 mm, directly acquired by the MaCh3D system. Even though the equivalence between ASTM and MaCh3D specimen has already been assessed, 8 further cross‐validation has been carried out for the material used. Five specimens have been produced starting from pure material according to parameters in Table 1, in the horizontal orientation, (Table 1) using 0° and 45° infill, both for MaCh3D and ASTM geometries, for a total of 20 specimens.…”

Section: Methodsmentioning

confidence: 99%

Mechanical properties comparison between new and recycled polyethylene terephthalate glycol obtained from fused deposition modelling waste

Bergonzi¹,

Vettori²

2021

Mat Design & Process Comms

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The recycling of materials and the efficient use of resources are nowadays fundamental in a circular economy perspective. This concept also applies to additive manufacturing (AM) where waste can be reused to produce new material. Using mostly thermoplastic polymers, fused deposition modeling (FDM) is an AM technique that allows to melt waste materials and, successively, using a suitable extruder, obtain new filament. In the process, polymers are subject to multiple re‐melting and polymer orientations by extrusion operations. The aim of this work is to evaluate the influence of the recycling process over polyethylene terephthalate glycol‐modified (PETG) mechanical properties by tensile testing of samples produced using pure and recycled material. Furthermore, filament itself has been tested to evaluate recycle process influence before FDM printing.

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“…These parameters are chosen as relevant factors for the experiments because expected to affect the polymer crystallinity, the coalescence and the intra-layers adhesion [13]. Three levels for each relevant factor are investigated, values are set on the basis of previous experiences [4,14] and considering the ranges indicated in the manufacturers data sheets (table 1). Worth nothing that the building time is highly affected by the specimen volume, the deposition speed and the layer height.…”

Section: D Printers and Process Parametersmentioning

confidence: 99%

“…The mechanical testing is performed using MaCh3D, a miniaturized universal testing machine (figure 3) developed for products and materials certification directly on the production site [14], peculiarity relevant for additive manufacturing. Indeed additive manufacturing needs the development of cost effective and transportable tools.…”

Section: Characterization Set-upmentioning

confidence: 99%

Additive Manufacturing Process Parameter Influence on Mechanical Strength of Adhesive Joints, Preliminary Activities

Frascio

Bergonzi

Jilich

et al. 2019

APP

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The work illustrates how building parameters of the Additive Manufacturing process Fused Filament Fabrication can aﬀect not only the mechanical properties but also the surface wettability and morphology. Wettability and morphology are relevant factors in bonded joints performance. Advantages of polymeric additive manufacturing are to allow a re-design of components with locally controlled properties and integrated functions. Major limitations are related to the lack of material testing standardization and constraints due to the build volume and to the object orientation for printability: the latter problem scan be addressed with the use of bonded joints that allow to create bigger assemblies from smaller parts optimally designed to take advantage of material orthotropy and without the structural drawbacks. In this study, two materials are considered, acrylonitrile butadiene styrene and polylactideacid. Wettability, surface morphology and mechanical strength have been determined at diﬀerent combinations of nozzle temperature, print speed and layer thickness.

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Numerical and experimental validation of a non-standard specimen for uniaxial tensile test

Cited by 17 publications

References 6 publications

3D Printed Masks for Powders and Viruses Safety Protection Using Food Grade Polymers: Empirical Tests

3D Printed Masks for Powders and Viruses Safety Protection Using Food Grade Polymers: Empirical Tests

Mechanical properties comparison between new and recycled polyethylene terephthalate glycol obtained from fused deposition modelling waste

Additive Manufacturing Process Parameter Influence on Mechanical Strength of Adhesive Joints, Preliminary Activities

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