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• W2070547460 endingPage "1160" @default.
• W2070547460 startingPage "1149" @default.
• W2070547460 abstract "Dynamic and quasi-static compressive deformation of as-cast and normalized porous S15CK carbon steels with cylindrical pores oriented in one direction was investigated at 298 and 77 K, using the split Hopkinson pressure bar method and a universal testing machine, combined with an acoustic emission measurement system, to clarify the formation mechanism of a plateau stress region where deformation proceeds with almost no stress increase. Dynamic and quasi-static compressions perpendicular to the orientation of the pores at 298 and 77 K do not produce a plateau stress region in the as-cast and normalized porous S15CK, because the localized crack formation and slip deformation that originate from the large concentration of stress around pores promotes densification in the early stage of the stress–strain curves. When the samples undergo dynamic compression parallel to the pore direction at 77 K, the matrix becomes brittle, and cracks are easily formed. However, the pores do not easily collapse, because they are oriented along the compressive direction. Therefore, densification occurs at a higher strain level. In addition, the formation of small cracks in the matrix decreases the work hardening rate. As a result, a plateau stress region with high stress amplitude and wide strain range appears, which is independent of the microstructure. This mechanism for the formation of the plateau stress region is completely different from that of metal foams with isotropic pores, which is based on sequential inhomogeneous deformation. As a result, energy absorption 10 times that of commercial aluminum foams is achieved." @default.
• W2070547460 created "2016-06-24" @default.
• W2070547460 creator A5013330843 @default.
• W2070547460 creator A5018284789 @default.
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• W2070547460 date "2012-02-01" @default.
• W2070547460 modified "2023-09-23" @default.
• W2070547460 title "Peculiar formation mechanism of a plateau stress region during dynamic compressive deformation of porous carbon steel with oriented cylindrical pores" @default.
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• W2070547460 doi "https://doi.org/10.1016/j.actamat.2011.11.001" @default.
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