Abstract
A two-dimensional photoelastic study was made of stress-concentration factors and stress distributions in a statically loaded tension bar with symmetrical U-shaped grooves. A new procedure using a known source of stress concentration in series with an unknown stress concentration was developed which practically eliminates all errors due to time-edge effects, extrapolation procedures and other disturbances. The photoelastic results confirm Kikukawa's observation1 that the maximum stress concentration may occur in bars with grooves of finite depth rather than with infinitely deep grooves as is generally assumed.
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