EFFECT OF SURFACE CONDITION AND PRIOR PLASTIC DEFORMATION ON X-RAY EFFECTIVE ELASTIC PARAMETERS IN A STEEL AND ITS WELD |
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| Authors: | R.W. Hampton D.V. Nelson |
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| Affiliation: | Acting Chief, Test Engineering and Analysis Branch, NASA Ames Research Center, Moffett Field, CA;Associate Professor, Mechanical Engineering Dept., Stanford University, Stanford, CA |
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| Abstract: | The effective elastic parameter (EEP) was determined for three material and surface conditions of ASTM 516 grade 70 steel and found to differ by as much as 19 percent. This difference occurred between data for plate with a machined surface and that for a chemically milled surface.
In these tests, the same EEP appeared to apply for specimens both before and after exposure to yield level strains. This suggests that the X-ray calibration data may be used to determine stresses in welds exposed to yield-level residual strains as long as the appropriate EEP values are used for the weld material and surface condition. |
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