Theoretical analysis on the collapse mechanisms of thin-walled composite tubes

Boria, Simonetta; Pettinari, Silvia; Giannoni, Fabio

doi:10.1016/j.compstruct.2013.03.020

Cited by 31 publications

(15 citation statements)

References 21 publications

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“…As in [29,30] the internal and the external fronds have the same length of the crush length during the opening. Assume that b c is the frustum side width at the crack tip related to the position of the crack initiation that verifies…”

Section: Composite Square Frustum: Analytical Modelmentioning

confidence: 91%

“…As in [29], the total crush procedure can be obtained repeating the first single crush cycle choosing suitable frustum side width at the crack tip. Therefore in the following we analyze the energy absorbed in a single crush cycle by a thin-walled composite truncated square pyramid subjected to axial loading.…”

Section: Composite Square Frustum: Analytical Modelmentioning

confidence: 99%

“…Following [29,30] the crushing dynamics through four different phenomena were modeled: fronds bending, axial splitting, crack propagation and friction between the annular wedge and the fronds and between the fronds and the platen of the press.…”

Section: Composite Square Frustum: Analytical Modelmentioning

confidence: 99%

“…The analysis is based on previous research [17,[25][26][27][28][29] on similar structures in order to improve the mathematical modeling reducing some simplifications dictated by experimental evidence. The theoretical modeling is based on an energetic approach, identifying the main energy contributions responsible for internal absorbing and balancing them to the work done by the external load.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Analytical and numerical analysis of composite impact attenuators

Boria

Pettinari

Giannoni

et al. 2016

Composite Structures

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Section: Composite Square Frustum: Analytical Modelmentioning

confidence: 91%

Section: Composite Square Frustum: Analytical Modelmentioning

confidence: 99%

Section: Composite Square Frustum: Analytical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analytical and numerical analysis of composite impact attenuators

Boria

Pettinari

Giannoni

et al. 2016

Composite Structures

Self Cite

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“…due to the relatively low stiffness of the composite material and the small thickness-radius of the tube, a composite thin-walled tube is prone to local instability and failure, and thus fails to take full advantage of the high strength of the composite materials [2]. Compared to thinwalled composite tube, the composite foam sandwich pipes have better local flexural rigidity due to the relative larger thickness-radius, and the local flexural rigidity takes full advantage of the high strength of the composite material [3].…”

mentioning

confidence: 99%

Experimental Tests on the Composite Foam Sandwich Pipes Subjected to Axial Load

Zhao

Xu³

et al. 2014

Appl Compos Mater

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Compared to the composite thin-walled tube, the composite foam sandwich pipe has better local flexural rigidity, which can take full advantage of the high strength of composite materials. In this paper, a series of composite foam sandwich pipes with different parameters were designed and manufactured using the prefabricated polyurethane foam coreskin co-curing molding technique with E-glass fabric prepreg. The corresponding axial-load compressive tests were conducted to investigate the influence factors that experimentally determine the axial compressive performances of the tubes. In the tests, the detailed failure process and the corresponding load-displacement characteristics were obtained; the influence rules of the foam core density, surface layer thickness, fiber ply combination and end restraint on the failure modes and ultimate bearing capacity were studied. Results indicated that: (1) the fiber ply combination, surface layer thickness and end restraint have a great influence on the ultimate load bearing capacity; (2) a reasonable fiber ply combination and reliable interfacial adhesion not only optimize the strength but also transform the failure mode from brittle failure to ductile failure, which is vital to the fully utilization of the composite strength of these composite foam sandwich pipes.

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

Zhu

Zhao

et al. 2020

Polymer Composites

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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.

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Theoretical analysis on the collapse mechanisms of thin-walled composite tubes

Cited by 31 publications

References 21 publications

Analytical and numerical analysis of composite impact attenuators

Analytical and numerical analysis of composite impact attenuators

Experimental Tests on the Composite Foam Sandwich Pipes Subjected to Axial Load

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

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