Tuning energy dissipation in damage tolerant bio-inspired interfaces

Morano, Chiara; Zavattieri, Pablo; Alfano, Marco

doi:10.1016/j.jmps.2020.103965

Cited by 25 publications

(18 citation statements)

References 49 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%

“…It was observed that the energy release rate was affected by the crack position with respect to the material distribution of the sub-surface geometry. By comparing the results obtained with the different channel shapes, it was established how channel shapes have a relevant effect on crack propagation and, therefore, a parametric study on sub-surface geometry was carried out in a second work [ 35 ]. It was found that increasing channel height, width and pitch has a positive effect on joint performance.…”

Section: Joint Design Strategies For Additive Manufacturingmentioning

confidence: 99%

“…The work by Afferrante et al [ 38 ] can be considered as complementary to the works by Alfano et al [ 33 ] and Morano et al [ 35 ] as it investigates the effect of 2D sub-surface structure with loading in different directions with respect to the tailored structures. The authors studied how it is possible to control the joint strength using the crack trapping mechanism and controlling the adherends’ stiffness.…”

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%

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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%

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%

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

et al. 2020

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“…As a result, under deflection-control, the structure demonstrates a sudden drop in structural response (snap-through) and the emitted energy may give rise to a virtual catastrophic branch of structural response (Carpinteri and Accornero, 2018;Xu et al, 2019;Heide-Jørgensen and Budzik, 2017). The occurrence of snap-back is dependent on multiple factors, such as the geometric characteristics of structure and initial notch (Gajo, 2004;Salviato et al, 2019), material properties (brittle or ductile), boundary conditions (Carpinteri, 1989;Carpinteri and Accornero, 2018) and property heterogeneity (Xu et al, 2019;Heide-Jørgensen and Budzik, 2017;Xia et al, 2013;Xia et al, 2015;Morano et al, 2020). Implicit finite element codes are normally employed to numerically predict responses with non-linearity.…”

mentioning

confidence: 99%

Snap-back instability of double cantilever beam with bridging

Lü

Lubineau

2021

International Journal of Solids and Structures

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Adhesive bonding community shows a continued interest in using bridging mechanisms to toughen the interface of secondary bonded joints, especially in the case of laminated composites. Due to snap-back instability that occurs during fracture, confusions may exist when identifying the toughening effect experimentally. The true toughening effect may be overestimated by lumping all energy contributions (kinetic energy included) in an overall effective toughness. Here, fundamentals for bridging to enhance fracture resistance are explored through the theoretical analysis of the delamination of a composite double cantilever beam (DCB) with bridging. Specifically, we establish a theoretical framework on the basis of Timoshenko beam theory and linear elastic fracture mechanics to solve the fracture response of DCB in the presence of discrete bridging phases. We elucidate the crack trapping and the snap-back instability in structural response during the crack propagation. We identify the contribution to the overall toughness observed numerically/experimentally of both the physical fracture energy and other types of dissipation.The associated toughening mechanisms are then unveiled. Furthermore, we study the effects of property of the bridging phases on the snap-back instability, based on which, we propose a dimensionless quantity that can be deployed as an indicator of the intensity of snap-back instability. Finally, we identify the role of geometrical properties, i.e. the substrate thickness and the arrangement spacing of the bridging phases, in the snap-back instability and the macroscopic fracture toughness of a DCB. This work provides, from a theoretical point of view, an essential insight into the physics related to the structural response of DCB with discrete toughening elements.

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