Mohr's Circle is a useful tool for understanding stress in materials when they are being pushed or pulled in multiple directions. However, using it can be tricky. Here are some of the challenges people face:

1. Understanding the Graph:

   • It can be hard for students to get what the circle means.
   • Placing the circles correctly takes a lot of careful work.

2. Moving from Theory to Real Life:

   • In the real world, things get more complicated because materials don't always act as expected.

3. Choosing Failure Criteria:

   • Figuring out the right criteria for failure makes it harder to analyze and make decisions.

To deal with these issues, practicing a lot and using software tools can help people understand better and make analyzing stress easier.