Dynamic fracture energy of polyurea-bonded steel/E-glass composite joints

Kim, H.; Citron, Jason; Youssef, George; Navarro, Artemio; Gupta, Vijay

doi:10.1016/j.mechmat.2011.08.017

Cited by 29 publications

(18 citation statements)

References 20 publications

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“…, Davidson and Sudame, 2004, Knox et al, 2000 and acts to prevent fragments breaking off the back surface of the wall, effectively holding it together during the blast event. Polyurea has also been used in the design of sandwich materials , composite panels (Hui and Oskay, 2012, Kim et al, 2012, McShane et al, 2008 and as a helmet suspension pad material (Grujicic et al, 2007), to mitigate blast effects. Additionally, some researchers have considered the use of polyurea to improve the blast or impact load resistance of metallic structures , Amini et al, 2010a, Amini et al, 2006, Amini et al, 2010b, McShane et al, 2008.…”

Section: Declarationmentioning

confidence: 99%

“…Polyurea has also been used in the design of sandwich materials (Bahei-El-Din and , composite panels (Hui and Oskay, 2012, Kim et al, 2012, McShane et al, 2008 and as a helmet suspension pad material (Grujicic et al, 2007) to mitigate blast effects. Used in a sandwich structure, the foam core used a graded design with three layers of foam of increasing density (from the loading surface to the back surface).…”

Section: Polyurea Coatings For Blast Mitigationmentioning

confidence: 99%

“…Future work may investigate combining polyurea with other materials in either a layered or sandwich plate configuration or as a matrix in a composite material. The use of polyurea in sandwich panels under blast loading has been investigated by a number of authors as well as in composite panels (Hui and Oskay, 2012, Kim et al, 2012, McShane et al, 2008. Experimental and numerical testing using the methods developed in this thesis could be applied to further understand the effect of sandwich plates containing polyurea and how they might be used to provide blast protection.…”

Section: Polyurea Combined With Other Materialsmentioning

confidence: 99%

See 2 more Smart Citations

Deformation of polyurea-coated steel plates under localised blast loading

Ackland

Anderson

Ngo

2013

International Journal of Impact Engineering

156

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Section: Declarationmentioning

confidence: 99%

Section: Polyurea Coatings For Blast Mitigationmentioning

confidence: 99%

Section: Polyurea Combined With Other Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Deformation of polyurea-coated steel plates under localised blast loading

Ackland

Anderson

Ngo

2013

International Journal of Impact Engineering

156

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“…Grujici and coworkers attributed the ability of polyurea to exceptionally perform in such loading scenarios to the underlying molecular structure . In addition, polyurea was investigated in response to different environmental and operating conditions such as temperature, humidity, and ultraviolet radiation, all of which confirmed its superior overall properties …”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of elastomeric polyurea foam

Reed

Huynh

Rosenow

et al. 2019

J of Applied Polymer Sci

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Polymeric foams are ubiquitous in impact mitigation for civilian and military applications; the performance in such loading scenarios can be elucidated through quasi‐static and dynamic mechanical testing. The present study reports on the complex microstructure of newly synthesized polyurea foams exhibiting a hierarchical structure consisting of large perforated semi‐closed spherical cells with a mean diameter of 370 ± 162 μm surrounded by smaller closed, spherical cells with size distribution of 69 ± 18 μm. The stress–strain curves were used to calculate the basic mechanical properties and to predict the dynamic behavior of the foams. Nonlinear regression and finite element analyses were used to calibrate the Ogden hyperfoam model to explicate the hyperelastic behavior. The performance of the polyurea foam was found to outperform a benchmark foam in nearly all the elastic and energy absorbing properties. For example, one variation of the newly synthesized foam stored nearly doubled the energy of the benchmark foam while being 12% lighter. Low‐density polyurea foam was found to decelerate an incoming impact mass with a minimum G‐level that was nearly one third lower than the higher density polyurea and benchmark foams. In all, the behavior of the foam is dependent on the parameters of the fabrication process. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48839.

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“…Polyurea is a thermoset elastomer which, due to its superior mechanical and physical properties, impact mitigation, moisture and chemical resistance, long elongation at tearing and a wide range of operating temperatures, makes it a suitable candidate for many engineering applications (Roland, et al, 2007;& Heinrich, 2000;Persson, et al, 2005;Bond, Morton & Krol, 1984;Rahalkar, 1989;Hoppie, 1982;Choi, Roland & Bissonnette, 1994;Davidson et al, 2004;Barsoum, G.S. & Dudt, P.J., 2010;Amirkhizi, et al, 2006;Amini, Isaacs & Nemat-Nasser, 2009;Jain, 2007;Kim, 2008;Youssef, 2011).…”

Section: Introductionmentioning

confidence: 99%

The effect of ultraviolet radiation on ultrasonic properties of polyurea

Whitten

Youssef

2016

Polymer Degradation and Stability

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Polyurea is used in military and civilian applications where exposure to the sun is commonly of long duration, which can deteriorate its mechanical performance to suboptimal levels. This study reports on the ultrasonic properties of polyurea as a function of ultraviolet radiation exposure duration and temperature. Six sets of samples were continuously exposed to ultraviolet radiation for different durations up to 15 weeks. Control samples were also tested that did not receive UV exposure. The ultrasonic properties were measured using high-frequency contact ultrasound transducers in pitch-catch configuration. All exposed samples exhibited significant color changes from transparent yellow to opaque light brown. Changes of color were observed as early as 3 weeks of UV exposure. Nonetheless, crazing was only observed in samples of 6, 9, 12, and 15 weeks of continuous exposure. The size of the surface cracks increased as the duration of exposure continued. The effect of extended UV radiation on the acoustic properties was noted to be minimal, where elastic and shear moduli decreased monotonically after an initial increase during the first 3 weeks of exposure. The attenuation properties were measured at 23°C and 40°C. The p-wave attenuation did not show any notable change, while the s-wave attenuation monotonically decreased as the temperature and UV exposure duration increased.

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Dynamic fracture energy of polyurea-bonded steel/E-glass composite joints

Cited by 29 publications

References 20 publications

Deformation of polyurea-coated steel plates under localised blast loading

Deformation of polyurea-coated steel plates under localised blast loading

Synthesis and characterization of elastomeric polyurea foam

The effect of ultraviolet radiation on ultrasonic properties of polyurea

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