Structural response and performance of hexagonal thin-walled grooved tubes under dynamic impact loading conditions

Isaac, Chukwuemeke William; Oluwole, Oluleke

doi:10.1016/j.engstruct.2018.04.053

Cited by 26 publications

(10 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For uniform evaluation of L y at both the left-and right-hand sections of the thin-walled tube, the small increase in length (∆) at the right-hand section is assumed negligible and l if of the left-hand section is approximately equal to that at the right-hand section. A relationship between the axial unfolding length, original length and number of complete folds was deduced by Isaac and Oluwole (2018) and it is written as…”

Section: Crushing Parameters For Idealized Thin-walled Tubementioning

confidence: 99%

See 1 more Smart Citation

Crushing response of circular thin-walled tube with non-propagating crack subjected to dynamic oblique impact loading

Isaac

2019

International Journal of Protective Structures

Self Cite

View full text Add to dashboard Cite

The dynamic oblique crushing of circular thin-walled tubes with the presence of non-propagating crack was investigated numerically. The material considered was strain rate sensitive with crack located at the distal end of the tube. Major crashworthiness parameters were obtained and the analysis of the structural response for idealized and finite element crushed thin-walled tubes was also carried out. The study shows that crack initiation on energy absorbing tubes increase their crushing force efficiency under oblique impact, decrease their crushing force efficiency under axial impact and reduce their crashworthiness performance such as the energy absorption capacity and specific energy absorption under axial and oblique impact. Results of the crashworthiness parameters, deformation modes, damage morphology, stress–strain relations, absorption energy characteristics and crushing force-displacement history were obtained. Furthermore, the numerical study reveals both the desirable and undesirable consequence of crack on the overall crashworthiness performance of energy absorbing circular thin-walled tubes.

show abstract

Section: Crushing Parameters For Idealized Thin-walled Tubementioning

confidence: 99%

“…Dividing the deformed length by n f gives the folding length l if . When the thin-walled tube is subjected to oblique impact loading conditions, the folding length can be expressed as (Isaac and Oluwole, 2018)…”

Section: Crushing Parameters For Idealized Thin-walled Tubementioning

confidence: 99%

Crushing response of circular thin-walled tube with non-propagating crack subjected to dynamic oblique impact loading

Isaac

2019

International Journal of Protective Structures

Self Cite

View full text Add to dashboard Cite

show abstract

“…For example, the axial crushing behavior of steel circular structure was investigated by using experimental and theoretical approaches as early as 1960s . Afterward, the investigations on energy‐absorbing characteristics and crashworthiness were spread to the structures with different geometrical shapes , and the applied loading cases were also multifarious .…”

Section: Introductionmentioning

confidence: 99%

On energy‐absorbing mechanisms of metal/WF‐CFRP hybrid composite columns

Zhu

Zhao

et al. 2020

Polymer Composites

View full text Add to dashboard Cite

Hybrid material system, comprised of metal and carbon fiber reinforced plastic (CFRP), combines the excellent mechanical performance and lightweight feature of CFRP with the competitive material cost and superior toughness of metal. By virtue of such mingled feature, metal/CFRP hybrid structure exhibits great potential in automotive components. This study aims to investigate the crushing behavior of aluminum/WF‐CFRP (woven fabric CFRP) hybrid columns subjected to dynamic loading condition by comparing with the corresponding individual columns made of single material (aluminum column and WF‐CFRP column). The dynamic axial crushing tests indicate that specific energy absorption of WF‐CFRP column is 45% higher than that of the aluminum column and 27% superior to that of the hybrid column, while the total energy absorption of the hybrid column is about 8% higher than the summation of WF‐CFRP column and aluminum column. Afterward, several finite element models are developed to reveal the underlying energy‐absorbing mechanisms and the influences of each factor for the hybrid columns. The numerical results show that specific energy absorption of the hybrid columns is negatively correlated with the metal volume fraction (F m), when inner aluminum wall thickness (t m) equals to 1.0 mm. It is also found that crushing process of the hybrid columns with l = 2 (2 CFRP layers) is dominated by the progressive folding of inner aluminum column, leading to a lower damage level of CFRP and lower load carrying capacity. With increasing wrapped CFRP layer number up to 8, the inner aluminum column starts to generate internal inversion deformation mode due to the restriction of the outer CFRP layers, and outer CFRP layers exhibit progressive failure. The energy‐absorbing mechanisms analysis indicates that the internal energy of the internally inversed aluminum column is significantly higher than that of the progressively folded aluminum column, and thus such special deformation mode is capable to offer a more stable and higher load carrying capacity for the hybrid columns. Besides, it is also found that the plastic deformation of the inner aluminum column is the major energy‐absorbing mechanism, which is followed by the crushing failure of outer CFRP layers. The combination mode of thinner aluminum column and thicker CFRP layers tends to offer higher energy‐absorbing capacity, which is much higher than that of the summation of corresponding individual columns. Finally, a complex proportional assessment method is considered to select the optimal configuration achieving the balance of material cost and structural crashworthiness. The present study is expected to provide guideline for design of metal/CFRP hybrid columns.

show abstract

“…absorbing components made of thin-walled tubes play a significant role in protecting occupants when the collision occurs [1]- [7]. Such tubes which are made of aluminium alloy can deform plastically in different modes, such as progressive buckling [8], [9], global bending [10], [11], inextensional (asymmetric) mode [12], and extensional (symmetric) mode [13], dissipating the impact energy and thus they improve the passive safety of the vehicle and protect the passengers.…”

mentioning

confidence: 99%

“…The crush response of thin-walled tubes under axial loading is featured by an initial high Peak Crush Force (PCF) which might cause serious negative effects [2]. With the aim of diminishing the magnitude of PCF, crush initiator techniques such as corrugations [16], [29], holes [30], grooves [9], [31] are normally applied to thin-walled tubes. The crush initiator or triggers are not only reducing the PCF but also promoting the desirable deformation mechanism such as the progressive buckling.…”

mentioning

confidence: 99%

Theoretical and numerical crush analysis of multi-stage nested aluminium alloy tubular structures under axial impact loading

Tran

Baroutaji

2019

Engineering Structures

View full text Add to dashboard Cite

show abstract

Structural response and performance of hexagonal thin-walled grooved tubes under dynamic impact loading conditions

Cited by 26 publications

References 42 publications

Crushing response of circular thin-walled tube with non-propagating crack subjected to dynamic oblique impact loading

Crushing response of circular thin-walled tube with non-propagating crack subjected to dynamic oblique impact loading

On energy‐absorbing mechanisms of metal/WF‐CFRP hybrid composite columns

Theoretical and numerical crush analysis of multi-stage nested aluminium alloy tubular structures under axial impact loading

Contact Info

Product

Resources

About