Relation between {open_quotes}failure{close_quotes} and {open_quotes}damage{close_quotes}. Quarterly report, April--June 1970

Results of this investigation show that the {open_quotes}damage point{close_quotes} derived from an interrupted tensile test does not correspond to the {open_quotes}failure point{close_quotes} obtained from a creep test. It may correspond to the first transition point in constant-stress creep tests. The {open_quotes}damage point{close_quotes} is obtained from repeated tensile stress cycles of ever-increasing intensity; when the stress-strain curve no longer follows parallel paths, the {open_quotes}damage point{close_quotes} has been reached