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Blast-Induced Response of Closed Cellular Rigid Polyurethane Foam
Material characteristics and their response are key to blast mitigation. The sudden pressure jump in the pressure profile of the blast wave is called the positive peak overpressure \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\left( {P_{so}^{ + } } \right)$$\end{document}. It reduces to the ambient condition in milliseconds, which creates a positive impulse \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\left( {i_{p}^{ + } } \right)$$\end{document} and exerts as blast loading on the material. The blastwave is commonly mitigated by using various materials and dissipating the energy impinging on it. But, the mechanical response of cellular material exhibits three interesting regions in quasi-static compression: linear elastic regime (initiation of cell wall bending), plateau (cell wall collapse happens and stress becomes constant) and densification (cell wall contacts each other and the stress rises steeply). Because of the extended plateau region, cellular solids are used for blast wave mitigation. In this study, the mechanical response of the closed cellular, rigid polyurethane (PU) foam of densities 120 kg/m3, say D1, and 50 kg/m3, say D2, when subjected to blast pressure, is observed. The uniaxial strain mode of compression is carried out by restraining the rear side and around the model. The front face displacement of the PU foam impacted by the blast wave of incident pressure 200 kPa with Mach number 1.7 is 1.454 and 14.92 mm for D1 and D2 foam density, respectively, and the displacement ratio is 10.26. The low-density foam is better in pressure absorption by undergoing large deformation.
Blast-Induced Response of Closed Cellular Rigid Polyurethane Foam
Material characteristics and their response are key to blast mitigation. The sudden pressure jump in the pressure profile of the blast wave is called the positive peak overpressure \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\left( {P_{so}^{ + } } \right)$$\end{document}. It reduces to the ambient condition in milliseconds, which creates a positive impulse \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\left( {i_{p}^{ + } } \right)$$\end{document} and exerts as blast loading on the material. The blastwave is commonly mitigated by using various materials and dissipating the energy impinging on it. But, the mechanical response of cellular material exhibits three interesting regions in quasi-static compression: linear elastic regime (initiation of cell wall bending), plateau (cell wall collapse happens and stress becomes constant) and densification (cell wall contacts each other and the stress rises steeply). Because of the extended plateau region, cellular solids are used for blast wave mitigation. In this study, the mechanical response of the closed cellular, rigid polyurethane (PU) foam of densities 120 kg/m3, say D1, and 50 kg/m3, say D2, when subjected to blast pressure, is observed. The uniaxial strain mode of compression is carried out by restraining the rear side and around the model. The front face displacement of the PU foam impacted by the blast wave of incident pressure 200 kPa with Mach number 1.7 is 1.454 and 14.92 mm for D1 and D2 foam density, respectively, and the displacement ratio is 10.26. The low-density foam is better in pressure absorption by undergoing large deformation.
Blast-Induced Response of Closed Cellular Rigid Polyurethane Foam
Lecture Notes in Civil Engineering
Chouw, Nawawi (editor) / Zhang, Chunwei (editor) / Kaviarasu, K. (author) / Alagappan, P. (author)
Australasian Conference on the Mechanics of Structures and Materials ; 2023 ; Auckland, New Zealand
Proceedings of the 26th Australasian Conference on the Mechanics of Structures and Materials ; Chapter: 79 ; 919-928
2024-09-03
10 pages
Article/Chapter (Book)
Electronic Resource
English
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