Dynamic and static stress concentration factors aDmK and as generated at a fillet part are observed by photoelastic method, and the comparison between two different factors is carried out. Next, the reflection coefficient A is calculated using the height of incident and reflected waves measured by the strain gauge. As die result, following relationship aDmax = ( 1+ A ) as is derived experimentally. The equation shows that the maximum dynamic stress concentration factor aon* is easily calculated using the static stress concentration factor asand the reflection coefficient A.
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