Dear colleagues,
In many papers, dealing with the VECD model, it is stated that fatigue damage in e.g. 4PB tests are caused by the change in dissipated energy between two repetitions. This in a way makes sense force-controlled 4PB tests because the dissipated energy per cycle increases during the test. And so the change is positive. But how about deflection-controlled tests (which are used in general), here the dissipated energy per cycle decreases during the test, and therefore the change will be negative. And in my view trying to induce a (micro)crack will cost energy.
What's tour opinion about this note?
Regards
Ad Pronk
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