# How do you identify the elastic limit and yield point on a stress/strain graph?

I understand what these points are, but I'm struggling to identify E and Y on certain graph shapes.

With graph B I can identify Y, but there doesn't seem to be a clear elastic limit between P and Y.

With graph C there doesn't seem to be a clear yield point or elastic limit, so I'm not sure where I would place them.

Graph D doesn't follow Hooke's Law at all, so there is no limit of proportionality. In this case, where would the elastic limit and yield point go?

Note: This is not a specific homework question, in case anyone thinks the question is too specific. This is a general question about the placement of points on a graph that I need to be able to do for my A-Level course.

• Possible duplicate of Yield Point and Elastic Limit Jul 3, 2017 at 23:06
• It's not. I read that question before posting this one. They're about the same topic (materials and stress strain graphs) but are about different elements of those topics. That question was about what Y and E are, and this question is about how to identify them on a graph. Jul 4, 2017 at 8:06