• Proceedings of the Materials Research Society of Korea Conference
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• 2008.11a
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• pp.12.2-12.2
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• 2008

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2008.11a
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• pp.334-335
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• 2008

• Proceedings of the Korean Fiber Society Conference
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• 2001.04a
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• pp.359.1-360
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• 2001

• Proceedings of the Korean Nuclear Society Conference
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• 2002.05a
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• pp.231.2-231
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• 2002

• Proceedings of the Korean Nuclear Society Conference
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• 2004.05a
• /
• pp.316.2-316.2
• /
• 2004

• Proceedings of the Korean Fiber Society Conference
• /
• 1997.10a
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• pp.385-389
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• 1997

• Proceedings of the Korean Fiber Society Conference
• /
• 1997.10a
• /
• pp.112-116
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• 1997

• Proceedings of the Materials Research Society of Korea Conference
• /
• 1998.11a
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• pp.151-151
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• 1998

• Journal of the Korea Concrete Institute
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• v.13 no.3
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• pp.268-276
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• 2001

A numerical model for the thermal response analysis of concrete structures is suggested. The model includes the stress-strain relationship, constitutive relationship, and multiaxial failure criteria at elevated temperature conditions. Modified Saenz's model was used to describe the stress-strain relationship at high temperatures. Concrete subjected to elevated temperatures undergoes rapid strain increase and dimensional instability. In order to explain those changes in mechanical properties, a constitutive model of concrete subjected to elevated temperature is proposed. The model consists of four strain components; free thermal creep strain, stress-induced (mechanical) strain, thermal creep strain, and transient strain due to moisture effects. The failure model employs modified Drucker-Prager model in order to describe the temperature dependent multiaxial failure criteria. Some numerical analyses are performed and compared with the experimental results to verify the proposed model. According to the comparison, the suggested material model gives reliable analytical results.

• Applied Chemistry for Engineering
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• v.25 no.5
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• pp.463-467
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• 2014

In this paper, the thermal behaviors of expanded graphite(EG)/erythritol composites with different contents of EG were studied. The surface and structure properties of the composites were determined by using scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD), respectively. The thermal properties were investigated by differential scanning calorimetry (DSC) and thermal conductivity (TC). As experimental results, the thermal conductivity of the composites increased with increasing the EG content. However, the latent heat was somewhat decreased in the presence of EG. We could concluded that EG was highly promising materials for improving the heat transfer enhancement and energy storage capacity of phase change materials (PCMs).