Questions about Hooke's Law graphs.Watch
2) If a graph has a straight line gradient up to a certain point, it is obeying Hooke's Law until the point where it reaches the limit of proportionality. After that, it starts to curve which is the elastic region. How can you tell where the plastic deformation region starts?
F vs ext graph; if line doesn't go through O, does object obey Hooke's Law?
If graph is a straight line up to limit of prop, Hooke's Law obeyed. Graph then curves; how can you tell where plastic deformation starts?
The small gaps 1) P -> E, 2) E -> Y mean the object 1) behaves elastically for a small extra load whilst F =/= ke 2) small extra load between the end of elasticity, start of plasticity. Thus object likely deforms a short way into the curved region.