Friday , December 3 2021

A small high-speed particle actually shows a study that melts a hole in a space station


If the particle collects a sufficiently high velocity when it breaks down, we know that even a dust or small droplet can damage a hard metal surface.

However, until now, there has been a problem in understanding how and why this damage occurred. Because the speed must be really high and the scales are really small.

Now, researchers at MIT have developed cameras that are fast enough and have enough magnification to capture this effect in detail, and have learned that these speeds are very intense. soluble surface.

Scientists were "unpredictable" on the basis of previous erosion research.

High-speed microscopic particles may actually be quite useful, and their shape of the surfaces is not bad. Sandblasting is the application of such an application or coatings.

But they can also be dangerous – such as micrometers that bomb the ISS, or particles that are carried by strong winds that hit the wind turbines.

"We want to understand the mechanisms and the exact conditions under which these erosion processes can take place, ece explains MIT's Mostafa Hassani-Gangaraj.

He and his team did a series of experiments to learn, using a microparticle pulse test bed developed in MIT. With a frame up to 100 million FPS, the test bed can record at incredibly high speeds.

They then formed a tin surface and used a laser to heat a tin piece. This evaporates the substrate surface and launches and accelerates the microscopic tin particles in the process. This resulted in about 10 micrometer tin particles with a diameter of about 0.01 millimeters – reaching a speed of one kilometer per second (2323 miles per hour).

They have also illuminated these effects using lasers to illuminate these effects.

This allowed them to see the mechanism that produced the damage for the first time, rather than relying on the examination of the surface after the impact.

And there, in the video, you can clearly see the molten material leaping from the impact area.

effect erosion semTo scan the electron micrograph of one of the effects of a 10 mikrom particle at 1 kps. (Hassani-Gangaraj and others)

This information is actually incredibly valuable. For example, industrial processes that use high-speed microparticles can help to develop, with higher speeds leading to better results than researchers.

These results show that this is not always the case – you cut it up too high and you can melt things unintentionally.

This can also help us understand how microparticles can damage turbines, spacecraft and oil pipelines. And the poor robots in Mars, we blew up those crazy dust storms. Engineers equipped with this new knowledge can develop more erosion-resistant materials for both space and terrestrial applications.

Obviously there is more research to be done. The team was used only in the tin and direct impact angle. There will probably be different stiffness or toughness levels for different materials and slightly different effects with different melting points (very few) and different impact angles.

However, this first step is quite impressive in demonstrating that the test bed and test setup can be used to capture and analyze this moment of impact.

MIT engineer David Veysset, "It is possible to extend the extent of erosion," he said.

The team's research was published in the journal Nature Communication.

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