Hello, I have a metallic specimen (assumed simplistically with null density) subjected to a load for a long time that, because of the creep, shows a certain additional deflection d2 in addition to that produced by the self-weight d1. Lets assume also that the specimen is perfectly elastic (no micro-cracks due to creep).
If at a certain point, I reduce the applied load (i.e. 0.5times), apart from the deflection due to self-weight deflection (d1^=0.5d1), will I immediately obtain a total recover of the creep deflection (d2=0) or a reduced creep deflection d2^ (d2^
Hi Michele,
By definition, the elastic strain is proportional to the applied stress. The creep behaviour is defined by an equation that relates the creep strain rate to a function of stress. Therefore, instantaneously, the only strain that changes when you halve the load is the elastic strain. The next question, however, is: "what is the creep strain rate at this point because the bar has already experienced some prior creep?" The two extremes are strain hardening and time hardening.
Regards,
Simon
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