Performance enhancement of tubular multilayers via compliance-tailoring: 3D printing, testing and modeling

Khan, M.A.; Kumar, S.

doi:10.1016/j.ijmecsci.2018.02.038

Cited by 35 publications

(12 citation statements)

References 47 publications

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“…Kumar et al [ 23 , 24 ] and Khan et al [ 25 , 26 ] used AM to create single lap joint (SLJ) geometries with tailored modulus in the bondline layer without additional joining, a process conceptually similar to that of AddJoining [ 12 ].…”

Section: Joint Design Strategies For Additive Manufacturingmentioning

confidence: 99%

“…The works of Khan et al [ 25 , 26 ] focused on the compliance tailoring of joints in cylindrical configurations using three different strategies for the gradation of the elastic modulus of the adhesive layer. These were the use of power law, exponential law and trapezoidal law ( Figure 4 ).…”

Section: Joint Design Strategies For Additive Manufacturingmentioning

confidence: 99%

“…At first, numerical and analytical analyses were carried out in order to investigate the best gradation coefficients for each elastic modulus design law [ 29 ]. In [ 25 ], authors observed that stress peaks at the tube end are greater than at the shaft ends, thus implemented monotonic elastic modulus variations using a power law and an exponential law. The bond layer elastic modulus at the overlap was tailored as a function of the axial coordinate between is the lowest elastic modulus ( E MIN = 280 MPa) and the highest elastic modulus ( E MAX = 2700 MPa).…”

Section: Joint Design Strategies For Additive Manufacturingmentioning

confidence: 99%

“…Experiments on this configuration were compared to baseline solutions with homogeneous bond layers with elastic modulus E MIN and E MAX , which confirmed model previsions as tensile load increments up to 100% and toughness increments up to 69%. Comparing the results from [ 25 ] and [ 26 ] it can be observed how symmetrical elastic modulus bond layer tailoring is more effective than monotonic tailoring. This is true even for geometries that have non-symmetrical stress distributions under tensile loading due to the geometrical configuration of the joint.…”

Section: Joint Design Strategies For Additive Manufacturingmentioning

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: Joint Design Strategies For Additive Manufacturingmentioning

confidence: 99%

Section: Joint Design Strategies For Additive Manufacturingmentioning

confidence: 99%

Section: Joint Design Strategies For Additive Manufacturingmentioning

confidence: 99%

Section: Joint Design Strategies For Additive Manufacturingmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2020

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“…The ability of emerging multimaterial additive manufacturing (AM) to tailor features of the joined structures to enable higher-performance joined multilayers in a single manufacturing process opens new opportunities to expand function and increase performance. Examples of tailoring enabled by multimaterial AM include modification of surface texture at the bonded interfaces 1 , geometrically interlocked layers 2 – 5 , and compliance tailoring of the bondlayer 6 – 9 .…”

Section: Introductionmentioning

confidence: 99%

Strength and Performance Enhancement of Multilayers by Spatial Tailoring of Adherend Compliance and Morphology via Multimaterial Jetting Additive Manufacturing

Ubaid

Wardle

Kumar

2018

Sci Rep

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Material tailoring of bondlayer compliance is a known effective route to enhance performance of multilayers, and here spatial material-tailoring of compliance and morphology of the adherends is examined. Multimaterial jetting additive manufacturing (AM) allows us to realize for the first time compliance- and morphology-tailored adherends, and evaluate directly the mechanical performance, including failure, of the tensile-loaded multilayers. Adherend compliance-tailoring, unlike bondlayer tailoring, requires additional consideration due to adherend bending stiffness and moment influences on bondlayer stresses. We introduce anisotropic as well as layered/sandwich adherend tailoring to address this dependence. Numerical models show that for both sub-critical and critical bondlengths (at which shear-dominated load transfer occurs through the bondlayer), adherend tailoring reduces peak stresses significantly, particularly peel stress (reductions of 47–80%) that typically controls failure in such systems. At sub-critical bondlengths, the AM-enabled layered/sandwich adherend tailoring shows significantly increased experimental performance over the baseline multilayer: strength is increased by 20%, toughness by 48%, and strain-to-break by 18%, while retaining multilayer stiffness. The adherend tailoring demonstrated here adds to the techniques available to increase the performance of bonded multilayers, suggesting that adherend tailoring is particularly well-suited to additively manufactured multilayers, but can also have application in other areas such as layered electronics and advanced structural composite laminates.

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Enhanced Bonding via Additive Manufacturing‐Enabled Surface Tailoring of 3D Printed Continuous‐Fiber Composites

et al. 2018

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Additive manufacturing (AM) of composites, particularly continuous fiber composites as studied here, is emerging as a new paradigm for creating advanced structures. Traditional machining and joining approaches will evolve or be fully displaced by AM approaches, and here the authors introduce a seminal investigation into AM‐enabled bonding/joining of continuous fiber composite laminates/multilayers. The AM‐enabled tailoring approach volumetrically increases surface area available for bonding by ∼150% by printing lines of continuous Nylon matrix filaments at an infill density of 50% to create a porous (∼50 vol%) bonding surface, rather than the conventional/baseline solid (100 vol%) surface approach. The AM‐tailored multilayers show improvements relative to the baseline single‐lap‐joint (SLJ) multilayer, and versus the industry‐standard surface preparation approach: 550% and 145% increases in ultimate strength, 10 000% and 800% increases in toughness, respectively, while maintaining joint stiffness. Benchmark mechanical performance data is established via the AM‐tailored bonding approach for carbon, glass, and Kevlar continuous fiber reinforced additively manufactured composite SLJ multilayers. AM‐enabled enhanced joining, such as the concept demonstrated here, is critical as AM components are increasingly being joined, both to each other and to other (non‐AM, different AM, etc.) structures in advanced applications.

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Performance enhancement of tubular multilayers via compliance-tailoring: 3D printing, testing and modeling

Cited by 35 publications

References 47 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

Strength and Performance Enhancement of Multilayers by Spatial Tailoring of Adherend Compliance and Morphology via Multimaterial Jetting Additive Manufacturing

Enhanced Bonding via Additive Manufacturing‐Enabled Surface Tailoring of 3D Printed Continuous‐Fiber Composites

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