Physics question - new spec - HELP! Watch
Why is the yield point at B and not C? Isn't the yield point the stress or force at which a large amount of plastic deformation takes place with constant or reduced load? On the graph, extension increases for a decrease in force at C, so why is B the yield point?
B is the yield point, C is the UTS, you get some molecular rearrangement after yield point which lowers youngs modulus at that point but after UTS material is breaking so also some molecular reshuffle there. In general the little hump after the elastic limit is the yield point