Okay, willkommen back, everyone.

I hope you had a nice winter break, nice holidays for those who celebrate.

And I hope you are eager and motivated to learn more in the year 2025.

And I hope you didn't forget too much.

So last time we started with the topic of nanomechanical testing and we looked at different testing methods already.

Let's assume we work for a company that produces thin films for microelectronic industry.

And you just found the best material ever, a new material that you fabricated with different deposition methods.

And it has the perfect electronic and optical properties.

Now your boss comes to you and says that's all nice.

The company is already in the earth club. However, we also need to know the mechanical.

Because we don't want to apply this film to microelectronics and then it fails on the future.

So we need some kind of lifetime prediction.

And for lifetime prediction, they usually want a stress strinker.

Now the problem is, you can only deposit this material with a thickness of 10 micrometers or less.

So how can you get a stress strinker of such a thin film?

I will move it a bit over so you can read it better.

Nanonentation, can you get a stress strinker from nanonentation?

We can convert it.

What kind of nanonentation did we talk about where we can get a stress strinker?

This was a nanonentation chapter back then.

If we use a specific kind of tip, we can get stress strinkers from nanonentation.

So we can use spherical indentation.

What else can we use? You already said, bulge test.

What methods can we use to get a stress strinker from such a small material?

Yeah.

Can you read it?

Tensile, yeah.

Microtensile testing.

The opposite of tensile testing.

Compression testing.

Micropillar compression.

And then we also have bending.

All of these except for the bulge test use the nanonentation device to measure.

Or to perform the experiment.

So that's the spherical indentation you talked already a lot about.

Going into too much detail there.

Bulge test was this free-standing film testing apparatus.

We have free-standing film here.

And on the bottom we load this either with liquid, but mostly usually we load it with gas pressure.

For microtensile testing, we use these dog bone shape samples.

And the gripper, that is basically the negative of this sample.

And we talked about micropillar compression, where we make the bar for the last three.

These are all methods where we use the print unit to make the samples.

And for the nononentation test, we use a flat punch.

Which is basically just a cylinder, flat cylinder, and we compress it.

And lastly we have bending.

This could be a three-point bending, but what we see mostly is cantilever bending.

We also use the FIP to make a cantilever like this.

And for our nononentation tip, we use a wedge or a sharp indenter.

So now you told your boss you know what to do.