Dependence Between the Mechanical Characteristics of the Material and the FDM Sample Made From This Material

Raspopina, V. B.; Perelygina, A Yu; Shemetov, L. I.; Grigorov, P.

doi:10.1007/978-3-030-85057-9_18

Cited by 2 publications

(3 citation statements)

References 15 publications

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“…Однако специфика FDM-технологии такова, что механические характеристики материала неравнозначны механическим характеристикам изделия [8]. В частности, на прочность изделия, помимо свойств материала, влияют следующие факторы: режим печати (скорость печати, скорость подачи материала, температурный режим и т.д.…”

Section: рис 1 модели внутренней структуры Fdm-деталейunclassified

“…При оценке механических характеристик таких материалов учитывается объемное соотношение газовой и полимерной фаз. Как правило, данные материалы имеют относительно равномерную ячеистую структуру, плотность которой в той или иной мере обеспечивается параметрами технологического процесса 8 . В некотором приближении структуру, заполняющую FDM-образец по шаблону «линии» с 50% заполнением и менее, можно считать эквивалентной ячеистой в рамках ГОСТ 17370-2017 7 .…”

Section: описание проблемыunclassified

“…Метод испытания на растяжение(ISO 1926(ISO :2009, Rigid cellular plastics -Determination of tensile properties, MOD). М.: Изд-во «Стандартинформ», 2018 8. Ярцев В. П., Андрианов К. А., Иванов Д. В. Физико-механические и технологические основы применения пенополистирола при дополнительном утеплении зданий и сооружений: учеб.…”

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Sample geometry transformation for mechanical tests of constructional materials in an FDM structure

Shemetov

Raspopina

Chernyshkov

2022

jour

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The aim was to obtain a rough determination of the dimensions and shape of a sample for an experimental study of the mechanical characteristics of filamentary FDM-printing structures with a low filling at central tension. The sample geometry was designed based on the dimensions and shape provided in the GOST 17370-2017 “Cellular rigid plastics. Tension testing method”. The research methods included the finite element analysis of stress state parameters in an automated environment, elements of the stiffened shell theory and experimental testing of samples. The theory of stiffened shells was used to simplify the geometry of the finite element model for the studied samples. Finite element analysis was carried out in a linear formulation and, based on the results of its combination with the analysis of the technological model of a designed sample, a decision on transforming the sample geometry was made. The samples were produced using a “line” template with an orientation along the longitudinal axis of the sample. According to the results of testing the samples, a conclusion about the success of implied transformation was made. The success criterion involves the destruction of an FDM sample within the limits of the working part. As a result, both external and internal geometries of the prototype sample were transformed. This allowed the main emphasis in the work of the stretchable FDM sample to be shifted to its working part and the trajectory of power flows to be adjusted according to the FDM-printing specifics. Experimental testing of FDM samples with a low “line” template filling showed a consistently satisfactory result: fractures occurred in the working part of test samples. In the course of the studies, the general trend in the dependence of the force flow distribution over the sample volume on the combination of the printing thread trajectory with external and internal geometries of the sample was determined. Future work will focus on a more detailed analysis and formalisation of the obtained results with regard to various printing templates.

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Section: рис 1 модели внутренней структуры Fdm-деталейunclassified

Section: описание проблемыunclassified

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Sample geometry transformation for mechanical tests of constructional materials in an FDM structure

Shemetov

Raspopina

Chernyshkov

2022

jour

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Hybrid deposition additive manufacturing: novel volume distribution, thermo-mechanical characterization, and image analysis

Harris

Mohsin

Potgieter

et al. 2022

J Braz. Soc. Mech. Sci. Eng.

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The structural integrity of additive manufacturing structures is a pronounced challenge considering the voids and weak layer-to-layer adhesion. One of the potential ways is hybrid deposition manufacturing (HDM) that includes fused filament fabrication (FFF) with the conventional filling process, also known as “HDM composites". HDM is a potential technique for improving structural stability by replacing the thermoplastic void structure with a voidless epoxy. However, the literature lacks investigation of FFF/epoxy HDM-based composites regarding optimal volume distribution, effects of brittle and ductile FFF materials, and fractographic analysis. This research presents the effects of range of volume distributions (10–90%) between FFF and epoxy system for tensile, flexure, and compressive characterization. Volume distribution in tensile and flexure samples is achieved using printable wall thickness, slot width, and maximum width. For compression, the printable wall thickness, slot diameter, and external diameter are considered. Polylactic acid and acrylonitrile butadiene styrene are used to analyze the brittle and ductile FFF structures. The research reports novel application of image analysis during mechanical characterization using high-quality camera and fractographic analysis using scanning electron microscopy (SEM). The results present surprising high tensile strain (0.038 mm/mm) and compressive strength (64.5 MPa) for lower FDM-percentages (10%, 20%) that are explained using in situ image analysis, SEM, stress–strain simulations, and dynamic mechanical analysis (DMA). In this regard, the proposed work holds novelty to apply DMA for HDM. The optimal volume distributions of 70% and 80% alongside fractographic mechanisms for lower percentages (10%, 20%) can potentially contribute to structural applications and future material-based innovations for HDM.

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Dependence Between the Mechanical Characteristics of the Material and the FDM Sample Made From This Material

Cited by 2 publications

References 15 publications

Sample geometry transformation for mechanical tests of constructional materials in an FDM structure

Sample geometry transformation for mechanical tests of constructional materials in an FDM structure

Hybrid deposition additive manufacturing: novel volume distribution, thermo-mechanical characterization, and image analysis

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