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Study on the Behavior of a Center Crack under Thermal Impact by the Dislocation Theory
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 Title & Authors
Study on the Behavior of a Center Crack under Thermal Impact by the Dislocation Theory
Cho, Chong-Du; Ahn, Soo-Ick;
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 Abstract
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.
 Keywords
Thermal Impact;Stress Intensity Factor;Dislocation Density;Climb Dislocation;Glide Dislocation;
 Language
Korean
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