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조종두,안수익,Cho, Chong-Du,Ahn, Soo-Ick 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.11
This paper investigated plane strain stress intensity factors caused by thermal impact on a center-crack strip. The crack was aligned perpendicularly to the strip boundary. The problem was analysed by determining the dislocation density function in the singular integral equations formulated by the dislocation theory. Under the abrupt temperature change along the edge, the center crack behaved as a mode I crack due to the symmetric geometry. The value of maximum stress intensity factor monotonically increased until the ratio of dimensionless crack length approached to about 0.3, followed by gradual decrease. As a result, a critical corresponding crack length was determined.
조종두,K. K. Poornesh,김재민 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.3
In this article, a micromechanically motivated constitutive model is presented for nafion membrane to capture the rate, temperature,and hydration dependency under monotonic and cyclic tensile loadings. The basic framework of this model is derived from the Arruda-Boyce viscoplastic model and is modified to include hygrothermal correction factors to show that this model can be manipulated to producereliable results under various virtual testing conditions.