An analytical model for assessing strain rate sensitivity of unidirectional composite laminates

Wang, W.; Makarov, G. E.; Shenoi, R.A.

doi:10.1016/j.compstruct.2004.04.017

Cited by 31 publications

(16 citation statements)

References 14 publications

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“…The literature on the strain-rate sensitivity of fibre reinforced composites is not straightforward. While it is generally accepted that the mechanical properties of most polymer matrix composites are rate sensitive, literature results are often contradictory as shown by Barré et al [5], summarising test data from 31 papers, and very recently by Wang et al [6]. Although inconsistencies maybe due to differences in matrix, reinforcement alignment and test conditions, they quite imply the complex nature of rate dependency for polymer matrix composites [7].…”

Section: Introductionmentioning

confidence: 81%

Vacuum infusion of a composite E-glass vinylester laminate for nautical application: experimental response to repeated impacts

Belingardi¹,

Cavatorta²,

Paolino³

2006

WIT Transactions on the Built Environment, Vol 87

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The aim of this paper is to investigate the response to repeated impacts of a non-symmetric glass fibre reinforced laminate. The laminate is intended for a nautical application and the manufacturing technique is vacuum infusion. In a first part of the work, four impact velocities (1.566 m/s, 2.215 m/s, 3.132 m/s and 3.836 m/s) were considered, and a minimum of four specimens for any given velocity were subjected to forty repeated impacts or up to perforation. The impact response was evaluated in terms of damage progression by visual observation of the impacted specimens, evolution of the peak force and of the bending stiffness with the number of impacts and by calculating the damage degree (ratio between the absorbed energy and the impact energy). In a second part of the work, additional single impact tests were performed at 4.429 m/s and 6.264 m/s to investigate the laminate strain-rate sensitivity.Repeated impact tests pointed out that the delamination area grows very rapidly in the first few impacts to then level off, following closely the behaviour of the bending stiffness against the number of impacts. The value of the peak force increases in the first few impacts due to compaction and strain-hardening of the resin with a related decrease of the damage degree. Comparison between quasi-static penetration tests and impact tests demonstrates a strain-rate dependency of the laminate bending stiffness and first damage load. The values of R 2 show a good fitness of a linear function on the experimental data.

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Section: Introductionmentioning

confidence: 81%

Vacuum infusion of a composite E-glass vinylester laminate for nautical application: experimental response to repeated impacts

Belingardi¹,

Cavatorta²,

Paolino³

2006

WIT Transactions on the Built Environment, Vol 87

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“…However, some previous studies have included strain rate effects for CFRP and adhesive material such as (Al-Zubaidy et al, 2013c, Hou and Ruiz, 2000, Wang et al, 2005. In this section, the empirical parameters that were suggested by Al-Zubaidy et al (2013c) will be used to include the effect of strain rate for CFRP and epoxy in the Cowper-Symonds model (Jones, 1997).…”

Section: Effect Of Strain Rate On Cfrp and Adhesive Materialsmentioning

confidence: 99%

Modelling impact resistance of polymer-laminated steelwork

Kadhim¹,

Wu²,

Cunningham³

2017

Proceedings of the Institution of Civil Engineers - Engineering

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This paper reports the numerical simulation of a series of carbon fibre reinforced polymer (CFRP) strengthened steel beams under impact loads. Non-linear finite element (FE) analysis is conducted using a proposed FE model validated via comparison with available experimental tests. The numerical model includes the effect of the strain rate for steel using the Johnson-Cook model, while for CFRP and adhesive materials the Cowper-Symonds model is employed. Several possible failure modes for the strengthened member can be captured using the FE model such as global steel failure, CFRP rupture and debonding between steel members and CFRP laminates. The numerical results show that the use of externally bonded CFRP laminates decreases mid-span deflection of strengthened beams in the series by 11%. While having the same level of impact kinetic energy, it is found that a beam struck at a lesser velocity and with a larger mass of impactor tends to have higher deflection both for the strengthened and un-strengthened cases. Additional key parameters such as CFRP laminate thickness are also investigated in this study.

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“…In an analytical study by Wang et al [39] to assess strain rate sensitivity of unidirectional composite laminates spring-dashpot models similar to those of rheological Kelvin-Voigt model of viscoelasticity were used and the unidirectional ply was simplified as a coated fibre bundle. They showed the higher sensitivity of GFRP plies to high strain rates than CFRP plies.…”

Section: Strain Rate Effectmentioning

confidence: 99%