Pressure solution creep under cyclic loadingстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Pressure solution creep was studied on sodium chloride, calcium
carbonate and ammonium nitrate in respective saturated aqueous solutions
under static loading and cyclic unloading. Ball indentation and powder
compaction curves show that each transition from static to cyclic regime
produces an increase-sometimes manifold-in creep rate which lasts over
the whole time of cyclic impact. After returning to static regime, the
initial creep rate reappears. Over longer-term tests, both in static and
cyclic regime, the creep gradually slows down. Increasing impact
frequency enhances the effect. Any noticeable changes in strain rate are
absent in a pure inert medium (paraffin oil). Possible mechanisms of the
cyclic unloading effect are discussed.