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

Khan, M.A. and Kumar, S. (2018) Performance enhancement of tubular multilayers via compliance-tailoring: 3D printing, testing and modeling. International Journal of Mechanical Sciences, 140, pp. 93-108. (doi: 10.1016/j.ijmecsci.2018.02.038)

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Material-tailoring of bondlayer has been demonstrated to be an effective route for the design of high performance adhesively bonded multilayers. Herein, enhanced performance of tubular bonded joints (TBJs) with compliance-tailored bondlayer is demonstrated both via experiments utilizing multimaterial additive manufacturing (AM) and modeling. An edge-compliance is imparted to end regions of the bondlayer mimicking the cortical bone microstructure via AM. For the ease of fabrication, TBJs with bi-modulus bondlayer having a single-step change in compliance is also 3D printed. The experimental tests performed on AM-enabled TBJs under axial tension show 100% and 70% increase in load carrying capacity and toughness respectively, compared to joints with homogeneous bondlayer. Finite element (FE) analyses performed on 3D printed joints under the same loading conditions reveal that the peak shear and peel stresses in the bondlayer are lower due to its increased edge-compliance. To identify optimal compliance-tailoring schemes and to characterize stress transfer through such bondlayer, an analytical model validated by an analogous FE model is proposed within the context of linear elastostatics. The effect of linearly-tailoring the compliance of the bondlayer with respect to mid-bondlength either partially or fully over the bondlength, on the stress-state is evaluated. A parametric study is conducted by perturbing the geometric and material properties so as to identify parameters for the optimal design of compliance-tailored multilayers.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Kumar, Professor Shanmugam
Authors: Khan, M.A., and Kumar, S.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:International Journal of Mechanical Sciences
ISSN (Online):1879-2162
Published Online:21 March 2018

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