Analysis of crack trapping in 3D printed bio-inspired structural interfaces

Morano, Chiara; Bruno, Luigi; Pagnotta, Leonardo; Alfano, Marco

doi:10.1016/j.prostr.2018.11.063

Cited by 14 publications

(13 citation statements)

References 9 publications

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“…The second approach draws inspiration from organisms which show high adhesion and toughness. Using a fracture mechanics-based approach, several authors [ 33 , 34 , 35 , 37 ] developed through the thickness structures able to delay crack propagation and the failure of the joints.…”

Section: Discussionmentioning

confidence: 99%

“…These first promising results led to further investigation carried out by Morano et al [ 34 ]. At first, FEM models for three different channel shapes were proposed and validated with experimental data in order to correlate the sub-surface geometry with the crack propagation behavior under mode I loading.…”

Section: Joint Design Strategies For Additive Manufacturingmentioning

confidence: 99%

“… Adherend bio-inspired stiffness tailoring using a sub-surface geometry as proposed in [ 33 , 34 , 35 ]. …”

Section: Figurementioning

confidence: 99%

“…The magnitude of the increment was distinct for the different investigated shapes using the digital image correlation (DIC) technique. Adherend bio-inspired stiffness tailoring using a sub-surface geometry as proposed in [33][34][35].…”

Section: Locally Controlled Propertiesmentioning

confidence: 99%

“…The adhesive material was deposited in a controlled way on the adherends using the AM process based on the continuous liquid Figure 6. Adherend bio-inspired stiffness tailoring using a sub-surface geometry as proposed in [33][34][35].…”

Section: Adhesive Tailoringmentioning

confidence: 99%

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Review of Tailoring Methods for Joints with Additively Manufactured Adherends and Adhesives

et al. 2020

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This review aims to assess the current modelling and experimental achievements in the design for additive manufacturing of bonded joints, providing a summary of the current state of the art. To limit its scope, the document is focused only on polymeric additive manufacturing processes. As a result, this review paper contains a structured collection of the tailoring methods adopted for additively manufactured adherends and adhesives with the aim of maximizing bonded joint performance. The intent is, setting the state of the art, to produce an overview useful to identify the new opportunities provided by recent progresses in the design for additive manufacturing, additive manufacturing processes and materials’ developments.

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Section: Discussionmentioning

confidence: 99%

Section: Joint Design Strategies For Additive Manufacturingmentioning

confidence: 99%

“… Adherend bio-inspired stiffness tailoring using a sub-surface geometry as proposed in [ 33 , 34 , 35 ]. …”

Section: Figurementioning

confidence: 99%

Section: Locally Controlled Propertiesmentioning

confidence: 99%

Section: Adhesive Tailoringmentioning

confidence: 99%

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Review of Tailoring Methods for Joints with Additively Manufactured Adherends and Adhesives

et al. 2020

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Reducing part deformation of isotactic polypropylene specimens fabricated with powder bed fusion technique through controlling crystallization behaviors

Gao,

Guo,

Zhang

et al. 2024

Journal of Polymer Science

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Serious shrinkage and warpage are obstacles to the development of ideal isotactic polypropylene (iPP) materials for polymer‐based powder bed fusion (PBF) technique. In this work, the variations of the dimensional accuracy of the PBF‐printed iPP parts were investigated with various printing parameter and nucleating agent. The iPP parts printed at a scanning speed of 700 mm/s exhibit smaller extents of shrinkage and curling than those at lower speeds, due to a lower degree of crystallinity. Interestingly, iPP blended with the α‐ or β‐nucleating agent demonstrates more serious part deformation with respect to neat iPP. Especially, α‐nucleating agent tends to trigger the most severe curling under the investigated printing parameters. Based on X‐ray diffraction and differential scanning calorimetry (DSC) results, both neat iPP and α‐iPP parts crystallize into α‐crystal, while β‐iPP parts display the coexistence of β‐ and α‐crystals. And, the difference of the crystallinity is less than 3% in three specimens. This suggests that both crystallinity and crystalline structure are not the main reasons for the shrinkage and warpage in this case. Instead, the severe part deformation of the α‐iPP parts is assigned to the narrower sintering window as well as the higher onset crystallization temperature of α‐iPP, which hinder relaxation of residual stresses. This work provides insights into the part deformation mechanism for PBF‐processed polymer materials.

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Effect of induced plastic strain on the porosity of PA12 printed through selective laser sintering studied by X-ray computed micro-tomography

Morano

Crocco

Formoso

et al. 2023

Int J Adv Manuf Technol

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3D printing is a widespread technology in different fields, such as medicine, construction, ergonomics, and the transportation industry. Its diffusion is related to the ability of this technique to produce complex parts without needing for assembly of different components or post-processing. However, the quality of the parts produced by additive manufacturing could be affected by the fabrication process, thus leading to the development of different kinds of defects such as porosity or inclusions. Understanding the role played by these defects and promoting strategies that could help reduce their occurrence represents a key point to allow using 3D printing for structural applications. In this work, 3D printed parts have been subjected to porosity characterization by using experimental tests on Dogbones samples subjected to plastic deformation. In particular, X-ray computed micro-tomography (µ-CT) has been employed as an investigation tool for the identification of fabrication defects and for analyzing the crack growth mechanism that occurs after subjecting samples to quasi-static loading conditions.

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Analysis of crack trapping in 3D printed bio-inspired structural interfaces

Cited by 14 publications

References 9 publications

Review of Tailoring Methods for Joints with Additively Manufactured Adherends and Adhesives

Review of Tailoring Methods for Joints with Additively Manufactured Adherends and Adhesives

Reducing part deformation of isotactic polypropylene specimens fabricated with powder bed fusion technique through controlling crystallization behaviors

Effect of induced plastic strain on the porosity of PA12 printed through selective laser sintering studied by X-ray computed micro-tomography

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