FATIGUE OF STRUCTURAL ELEMENTS DEVELOPMENT OF THEORY AND MEASUREMENT OF RESIDUAL STRESSES AT TEE FILLET WELDS IN 1-1/2 INCH HY-80 STEEL
NAVAL APPLIED SCIENCE LAB BROOKLYN NY
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A theory has been developed for the calculation of relaxation strains when a hole is drilled into a plate with a linearly varying stress field. With this theory a technique was developed for the measurement of residual stresses at the toe of tee fillet welds. The above technique was employed for the measurement of residual stresses at the toe of tee fillets in 1 12 in. HY-80 steel with the fillet in the as welded, ground, shot-peened, ground and shot- peened, and mechanically-peened condition. It was found that experimental data conform to the assumed theory, and that residual stresses in as welded tee fillet welds in both the transverse and longitudinal directions approach the yield strength of the steel. It was also found that residual stresses are reduced approximately 25 percent by grinding, 50 percent by shot peening and 50 percent by grinding and shot peening. Mechanical peening drastically affected residual stresses by converting high tension at the toe of the fillet weld to high compression of approximately the same magnitude.
- Properties of Metals and Alloys