A: Proportional limit| B: Elastic limit| C: Upper YP | D: Lower YP
Let us say, the gage length was 100mm (random, just for the sake of understanding). I know that if I unload the body anywhere between OB (O is the origin), the body will return back to its original shape and size. So if in the region OB it got to a length of say 102mm while loading, after unloading the body will again come back to 100mm.
I have two questions,
If suppose, I stretch the body up to anywhere in the region BC to a length of 104mm (say), then while unloading the body, the body wont come back to 100mm but to somewhere say 103mm. (some elastic recovery will take place). I have seen this in one of the videos on Youtube but I want to make sure if this is right?
If suppose I stretch the body up to anywhere in the region DE to say 110mm, then on unloading will the body remain at 110mm itself or will it show some recovery?