Plastic deformation of polyurea coated composite aluminium plates subjected to low velocity impact

Damith Mohotti, Tuan Ngo, Sudharshan Naidu Raman, Muneeb Ali, Priyan Mendis

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The demand for protective measures for structures is on the rise due to the increasing possibility of structural damage due to threats such as natural disasters, collision of vehicles, and blast and ballistic impacts. Application of an elastomer as a composite material with other base materials such as aluminium, steel and concrete has been considered as one of the measures to mitigate such threats. However, very limited work has been conducted in this area, especially on the feasibility of polyurea (elastomer) as a composite material against low velocity impacts. The focus of this research is to investigate the behaviour of polyurea coated composite aluminium plates subjected to rigid blunt-nosed projectile impact. AA5083-H116 aluminium alloy plates with polyurea coatings of 6. mm and 12. mm thickness were investigated. A blunt cylindrical projectile of high strength steel travelling in the velocity range of 5-15. m/s impacted at the centre of the 300. mm. ×. 300. mm square plates. A polyurea coating was used to absorb part of the impact energy and provide protection to the plates as an energy damping material through application on the impact side of the plates. In addition, uncoated aluminium plates of the same thickness were used in the test program. A gas gun mechanism was used to fire a 5. kg projectile, and laser displacement monitoring equipment was used to record the out-of-plane deformation history of the plate during the impact. The complete test setup has been modelled numerically using the advanced finite element (FE) code LS-DYNA. The models were validated with the experimental results. Deformation time histories obtained from both the experimental and numerical studies for the plates were used to compare the ability of polyurea to effectively mitigate the damage resulting from low velocity impact. The polyurea coated plates showed a considerable reduction in out-of-plane deformation when compared to the uncoated plates. These findings indicate that polyurea can be utilised as an efficient energy absorbing/damping material against low velocity impact damage.

Original languageEnglish
Pages (from-to)696-713
Number of pages18
JournalMaterials and Design
Volume56
DOIs
Publication statusPublished - 2014

Fingerprint

Aluminum
Plastic deformation
Projectiles
Composite materials
Elastomers
Damping
Coatings
Ballistics
High strength steel
Disasters
Aluminum alloys
Concretes
Steel
polyurea
Lasers
Monitoring
Gases

Keywords

  • Aluminium alloy
  • Composite plates
  • Low velocity impact
  • Plastic deformation
  • Polyurea

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Plastic deformation of polyurea coated composite aluminium plates subjected to low velocity impact. / Mohotti, Damith; Ngo, Tuan; Raman, Sudharshan Naidu; Ali, Muneeb; Mendis, Priyan.

In: Materials and Design, Vol. 56, 2014, p. 696-713.

Research output: Contribution to journalArticle

Mohotti, Damith ; Ngo, Tuan ; Raman, Sudharshan Naidu ; Ali, Muneeb ; Mendis, Priyan. / Plastic deformation of polyurea coated composite aluminium plates subjected to low velocity impact. In: Materials and Design. 2014 ; Vol. 56. pp. 696-713.
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