High energy absorption efficiency of thin-walled conical corrugation tubes mimicking coconut tree configuration

Ha, Ngoc San; Lu, Guoxing; Xiang, Xinmei

doi:10.1016/j.ijmecsci.2018.08.041

Cited by 141 publications

(33 citation statements)

References 53 publications

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“…These values were estimated by comparison of the experimental and numerical punch force vs. punch travel evolution from the Nakazima tests [ 61 ]. Similar values have been previously reported in literature for modelling thin-walled tube compression [ 67 ] and Erichsen cupping tests [ 68 ].…”

Section: Numerical Modellingsupporting

confidence: 90%

On the Use of Strain Path Independent Metrics and Critical Distance Rule for Predicting Failure of AA7075-O Stretch-Bend Sheets

2020

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The strain-based forming limit curve is the traditional tool to assess the formability of metal sheets. However, its application should be restricted to proportional loading processes under uniform strain conditions. Several works have focused on overcoming this limitation to characterize the safe process windows in industrial stretch-bend forming processes. In this paper, the use of critical distance rule and two path-independent stress-based metrics are explored to numerically predict failure of AA7075-O stretch-bend sheets with 1.6 mm thickness. Formability limits of the material were experimentally obtained by means of a series of Nakazima and stretch-bending tests at different thickness-over-radius ratios for inducing controlled non-uniform strain distributions across the sheet thickness. By using a 3D calibrated finite element model, the strain-based forming limit curve was numerically transformed into the path-independent stress and equivalent plastic strain polar spaces. The numerical predictions of necking strains in the stretch-bending simulations using the above approaches were successfully compared and critically discussed with the experimental results for different values of the critical distance. It was found that failure was triggered by a critical material volume of around the half thickness, measured from the inner surface, for the both path-independent metrics analyzed.

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Section: Numerical Modellingsupporting

confidence: 90%

On the Use of Strain Path Independent Metrics and Critical Distance Rule for Predicting Failure of AA7075-O Stretch-Bend Sheets

2020

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“…Ha et al [19] investigated the crashworthiness characteristics of a new bio-inspired conical corrugation tubes (CCTs). They classified the deformation of CCTs into four modes.…”

Section: Literature Reviewmentioning

confidence: 99%

Impact Performance of a Plate Structure with Coconut-Inspired Microchannels

2020

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Very few studies have been conducted in the past to reveal the underlying mechanism that causes the high-impact performance of coconuts as a natural composite material and a structure. The goal of this study is to understand the dominant microstructures of coconuts with respect to mechanical impact. In this study, we use a high-resolution X-ray computed tomography (CT) machine in scanning the microstructures and analyzing the patterns of microchannels in coconut shells. By using the established patterns, we model a novel plate structure with coconut-inspired microchannels. Numerical simulation elucidates a significant improvement in crashworthiness. The microchannel design opens a path to further developing self-healing composites and intelligent composites with sensing elements embedded in the channels.

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“…Crashworthiness optimisation of nested and concentric circular tubes under impact loading is also available in literature coupling Finite Element Method (FEM), Response Surface Models (RSM) and statistical based optimisation algorithms [45][46][47][48][49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of crushing and energy absorption characteristics of bio-inspired nested structures

Nikkhah

Baroutaji

Kazancı

et al. 2020

Thin-Walled Structures

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Mimicking anatomical structures like bone can aid in the development of energy absorbing structures that can achieve desirable properties. Accordingly, this study presents the analysis of tubular nested designs inspired by Haversian bone architecture. Based on this design philosophy, a total of 18 nested tube designs with various geometrical configurations were developed. Within each design, the effect of

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High energy absorption efficiency of thin-walled conical corrugation tubes mimicking coconut tree configuration

Cited by 141 publications

References 53 publications

On the Use of Strain Path Independent Metrics and Critical Distance Rule for Predicting Failure of AA7075-O Stretch-Bend Sheets

On the Use of Strain Path Independent Metrics and Critical Distance Rule for Predicting Failure of AA7075-O Stretch-Bend Sheets

Impact Performance of a Plate Structure with Coconut-Inspired Microchannels

Evaluation of crushing and energy absorption characteristics of bio-inspired nested structures

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