Abstract
In order to avoid local deformation and stress concentration at contact points between the extensometer and the specimen surface in a strain controlled fatigue test, the digital image measurements system was adapted to measure the displacement of the specimen gage during a fatigue test. Capability of the digital image system for the strain- controlled fatigue testing was studied by preliminary experiments. Low-cycle fatigue tests with various ranges of strain were conducted on solder materials at a constant temperature of 20 degrees C. The effect of variables in the digital image measurement system on the accuracy and the reliability were discussed. The results confirmed that this system was capable to measure the displacement for strain- controlled fatigue testing.
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