Abstract
An experimental procedure is described for through-thickness residual-stress determination in Fe−Ni−Cr alloy heat-exchanger tubing. The method involves the installation of a small number of strain gages on either the inner or the outer tube wall. Stress is released by controlled material removal by chemical etching of the opposite tube wall. A calculation procedure based on the Sachs' approach is proposed. The method is applied to the analysis of I-800 straight, as-received or stress-relieved tube specimens. Typical results are presented which indicate that it is possible to obtain an adequate through-thickness residual-stress distribution by combining the results of internally and externally etched tubes.
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