Effect of Locked Up Stresses on Ballistic Performance of Welded Armor: Investigation of the Stress Distribution across the Thickness of Weld
MASSACHUSETTS INST OF TECH CAMBRIDGE
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The present progress report is concerned with a preliminary investigation undertaken in accordance with the following recommendation of the Project Advisory Committee, p. 27, Final Report, Part 1, OSRD No. 3580, April 18, 1944. No. 4. Make a detailed study of the residual stress pattern through the thickness of the plate in the neighborhood of the weld, using the welded armor as well as low carbon plate which is better suited to the X-ray method. The investigation has been limited to a low carbon weld for which satisfactory x-ray stress determinations could be made. While not necessarily representative of the stress situation existing in the armor weld, the results are interesting in revealing a marked skin effect in the distribution of residual stress across the thickness of weld. They also show the usefulness of combining information secured by x-ray and wire gage measurements according to a method worked out at this laboratory.