Failure Analysis of Bi-Material FFF Parts

Fernández, Pedro Riesgo; Pelayo, F.; Avila, Dimas; Beltrán, Natalia; Blanco, David

doi:10.1016/j.promfg.2019.09.044

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…The encapsulation was chosen to identify which material would demonstrate dominance under the tensile stress. The mechanical interlocking and the overlap were designed because of the work of Tamburrino et al (2019) and Fernández et al (2019), respectively. Although these designs were studied before, a more comprehensive investigation of mechanical properties and comparison between them are required.…”

Section: Methodsmentioning

confidence: 99%

“…In this particular interface, the connection between materials was maintained by TPU fibers until the fracture occurred. The fibers of the flexible material sustained the link between two parts of the specimen enabling the gradual and considerable elongation of the fibers until reaching the highest strain at break (Fern andez et al, 2019). The materials were partially joined at the interface after the rupture.…”

Section: Mechanical Properties Of Multi-materials Pairsmentioning

confidence: 99%

“…In this method, the first layer of the second material is deposited at a higher nozzle temperature than the nozzle temperature for the consecutive layers. Fern andez et al (2019) found that the minimum degree of overlapping between two materials causes a significant increase in the strength of the sample.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the mechanical performance of mono-material vs multi-material interface geometries using fused filament fabrication

Dairabayeva

Perveen

Talamona

2023

RPJ

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Purpose Currently on additive manufacturing, extensive research is directed toward mitigating the main challenges associated with multi-material in fused filament fabrication which has a weak bonding strength between dissimilar materials. Low interfacial bonding strength leads to defects, anisotropy and temperature gradient in materials which negatively impact the mechanical performance of the multi-material prints. The purpose of this study was to assess the performance of different interface geometry designs in terms of the mechanical properties of the specimens. Design/methodology/approach Tensile test specimens were printed using: mono-material without a boundary interface, mono-material with the interface geometries (Face-to-face; U-shape; T-shape; Dovetail; Encapsulation; Mechanical interlocking; and Overlap) and multi-material with the interface geometries. The materials chosen with high and low compatibility were Tough polylactic acid (PLA) and TPU. Findings The main results of this study indicate that the interface geometries with the mechanical constriction between materials provide better structural integrity to the specimens. Moreover, in the case of the mono-material parts, the most effective interface design was the mechanical interlocking for both Tough PLA and TPU. On the other hand, in the case of multi-material specimens, the encapsulation showed the highest ultimate tensile strength, whereas the overlap and T-shape presented more robust bonding. Originality/value This study examines the mechanical performance, particularly tensile strength, strain at break, Young’s modulus and yield strength of different interface designs which were not studied in the previous studies.

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Section: Methodsmentioning

confidence: 99%

Section: Mechanical Properties Of Multi-materials Pairsmentioning

confidence: 99%