Okay, let's start. We are approximately at the halfway point of the semester. And before

we start with the recap, I want to say that my feedback from you, I really value that.

There is of course the official evaluation of the university, but that is at the end of the semester

and the system is kind of a bit flawed, because everything you write in the evaluation, you cannot

benefit from any changes I make to the course, right? So I put in Studon a survey, which is called

feedback, and it's very, very simple, four questions. What do you like about the lecture?

What don't you like about the lecture? What do you like about the exercises? What don't you like?

So if you want, you don't need to, you can fill out the survey. It's fully anonymous and you don't

have to answer every question. You can just answer one question, for example, and this will give me

feedback. And so I can adjust the idea, because I can adjust the lecture in the way that makes it

a better learning experience for you.

This can be everything from content of the lecture to my personal lecturing style or

presentation style to whatever we can think of.

I still need you to do the evaluation at the end of the semester, because that's how the university

assesses me. But this is just a service for you to provide feedback during the semester.

So. That being said, let's do a short recap of what we talked about last time. And the first

thing we talked about was the so-called indentation size effect.

What is the indentation size effect?

Yes.

We need to decrease the depth. We will see that the hardness is increased and we can see this from

the

exact.

So.

For a lot of materials.

We can observe the following if we.

If we plot the hardness over the indentation depth.

You would expect a constant hardness, which is also what we see back here.

But at some point.

The hardness increases for very small.

So what is the reason for this?

When we have our indent.

Right.

And then we zoom in here.

We can see.

Hier überall sind es so Whenever ich dem delta Kur....

towers.

As you see in some ,ераار s

We can see

different

,

now we can watch sinnet the defy

nation of hour sounding

und diese Strecke, die 90°-Strecke.

Und jede einer dieser Strecke produziert eine Verlustung.

Und das sind die sogenannten geometrischen Verlustungen.

Und das sind die Verlustungen.

Und wir haben hier alle diese geometrischen Verlustungen hier unter der Kante.

Und diese sind Verlustungslöcher, also eine Löcher um die Inventarie.

In unserem Material haben wir hier die Löcher, die wir hier in der Kante haben.

Und wir haben hier die Löcher, die wir hier in der Kante haben.