Impact mitigating capabilities of a spray-on elastomer coating applied to concrete.
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| Title: | Impact mitigating capabilities of a spray-on elastomer coating applied to concrete. |
|---|---|
| Authors: | Fallon, C.1 cf335@cam.ac.uk, McShane, G.J.1 gjm31@cam.ac.uk |
| Source: | International Journal of Impact Engineering. Jun2019, Vol. 128, p72-85. 14p. |
| Subjects: | Elastomers, Concrete, Protective coatings, Quasistatic processes, Finite element method |
| Abstract: | Highlights • Dynamic impact experiments are performed on elastomer-coated concrete. • An elastomer coating significantly reduces impact damage in the concrete substrate. • Numerical modelling suggests the elastomer alters damage initiation in the concrete. Abstract Structural protection against the effects of a nearby explosive detonation is an area of growing importance. Spray-on elastomer coatings are of interest as a practical and low cost protective solution. Recent research has demonstrated the effectiveness of such coatings for blast mitigation. However, there are two loading scenarios of concern for these applications: blast pressures and fragment impacts. To date, there remains a need to understand the merits of this protective solution for impact indentation of concrete structural elements. In this work, we examine whether, and by what mechanism, an elastomer coating can offer protection in this case. A series of quasi-static indentation and dynamic impact experiments are performed using a 0.1 kg circular cylindrical (i.e. blunt) projectile. It is demonstrated that the coating displays a significant protective capability over the full range of impact velocities considered, c. 45–150 m s − 1. The coating remains intact until impacted at a velocity of c.120 m s − 1 when it fails by a ductile, tearing mechanism, forming a plug which undergoes large elastic contraction after projectile penetration. A finite element model of the impact indentation of uncoated and coated concrete cubes is developed and validated against the experiments. Focusing on the early time steps and damage initiation in the concrete, the numerical model is used to interrogate the mechanism by which the elastomer achieves its mitigating effect. It is found that the way in which the elastomer alters the stress distribution in the concrete, and its time evolution, is key to its performance. These findings provide a basis for optimising protective coatings for concrete structural elements. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal of Impact Engineering is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 135077049 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Impact mitigating capabilities of a spray-on elastomer coating applied to concrete. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Fallon%2C+C%2E%22">Fallon, C.</searchLink><relatesTo>1</relatesTo><i> cf335@cam.ac.uk</i><br /><searchLink fieldCode="AR" term="%22McShane%2C+G%2EJ%2E%22">McShane, G.J.</searchLink><relatesTo>1</relatesTo><i> gjm31@cam.ac.uk</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Impact+Engineering%22">International Journal of Impact Engineering</searchLink>. Jun2019, Vol. 128, p72-85. 14p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Elastomers%22">Elastomers</searchLink><br /><searchLink fieldCode="DE" term="%22Concrete%22">Concrete</searchLink><br /><searchLink fieldCode="DE" term="%22Protective+coatings%22">Protective coatings</searchLink><br /><searchLink fieldCode="DE" term="%22Quasistatic+processes%22">Quasistatic processes</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Highlights • Dynamic impact experiments are performed on elastomer-coated concrete. • An elastomer coating significantly reduces impact damage in the concrete substrate. • Numerical modelling suggests the elastomer alters damage initiation in the concrete. Abstract Structural protection against the effects of a nearby explosive detonation is an area of growing importance. Spray-on elastomer coatings are of interest as a practical and low cost protective solution. Recent research has demonstrated the effectiveness of such coatings for blast mitigation. However, there are two loading scenarios of concern for these applications: blast pressures and fragment impacts. To date, there remains a need to understand the merits of this protective solution for impact indentation of concrete structural elements. In this work, we examine whether, and by what mechanism, an elastomer coating can offer protection in this case. A series of quasi-static indentation and dynamic impact experiments are performed using a 0.1 kg circular cylindrical (i.e. blunt) projectile. It is demonstrated that the coating displays a significant protective capability over the full range of impact velocities considered, c. 45–150 m s − 1. The coating remains intact until impacted at a velocity of c.120 m s − 1 when it fails by a ductile, tearing mechanism, forming a plug which undergoes large elastic contraction after projectile penetration. A finite element model of the impact indentation of uncoated and coated concrete cubes is developed and validated against the experiments. Focusing on the early time steps and damage initiation in the concrete, the numerical model is used to interrogate the mechanism by which the elastomer achieves its mitigating effect. It is found that the way in which the elastomer alters the stress distribution in the concrete, and its time evolution, is key to its performance. These findings provide a basis for optimising protective coatings for concrete structural elements. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Impact Engineering is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.ijimpeng.2019.02.003 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 14 StartPage: 72 Subjects: – SubjectFull: Elastomers Type: general – SubjectFull: Concrete Type: general – SubjectFull: Protective coatings Type: general – SubjectFull: Quasistatic processes Type: general – SubjectFull: Finite element method Type: general Titles: – TitleFull: Impact mitigating capabilities of a spray-on elastomer coating applied to concrete. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Fallon, C. – PersonEntity: Name: NameFull: McShane, G.J. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2019 Type: published Y: 2019 Identifiers: – Type: issn-print Value: 0734743X Numbering: – Type: volume Value: 128 Titles: – TitleFull: International Journal of Impact Engineering Type: main |
| ResultId | 1 |
