We know that even wheat & # 39; dust or tiny droplets can & # 39; damaging the surface of the hard metal if the particle gather enough speed when cut & # 39; it.
But & # 39; now there was a problem figuring out how or why such damage occurs. That's because the speed to be really freaking high, and the scales are really incredibly tiny.
Now, the MIT researchers have developed cameras that are fast enough, and sufficiently increase, to capture that moment & # 39; impact in detail – and learned that these speeds are so intense, the impact partially Facts melts the surface.
This was "unforeseen", based on previous research on erosion, scientists said.
The microscopic particles & # 39; speed can actually be quite helpful, and the way to escape is not bad surfaces. Sandblasting is one such application, or applying coatings.
But it can also be dangerous, as micrometeorites maturing the ISS, for example, or particles carried by strong winds affecting the wind turbines.
"We understand the mechanisms and the exact conditions when it can & # 39; these processes happen & # 39; erosion", explained the engineer Mostafa Hassani, Gangaraj of MIT.
So he and his team emerged with & # 39; & # 39 series, experiments to find out, using & # 39; micro-impact test developed at MIT. B & # 39; & # framerat of 39, to 100 million fps, the testbed can & # 39; register at incredibly high speeds required.
Then established a tin surface, and used a laser to heat another piece of & # 39; tin. This evaporates the surface of the substrate, excluding and accelerates the microscopic particles of tin in the process. This resulted in & # 39; tin particles & # 39; about 10 micrometers b & # 39; diameter – about 0.01 millimeters – hitting the tin surface in & # 39; speeds up to kilometers per second (2237 miles in hours).
Also used lasers to illuminate these impacts for a clear view of & # 39; what was happening.
This allowed to see, for the first time, the mechanism that produces the damage, rather than depending on the test surface after impact.
And there, in the video, you & # 39; see b & # 39; clearly molten material leaves & # 39; away from the impact site.
This information is actually incredibly valuable. Can & # 39; help improve, for example, those industrial processes using micro-b & # 39; high speed, where the accepted wisdom, according to the researchers, is that higher speeds get better results.
These results show that this is not always the case – kannukkjaha too high and you & # 39; melt things without intending to do so.
It also can & # 39; help us understand how the micro-turbines can harm, to space and to the system & # 39; oil pipelines. And what about the poor robots in & # 39; tightly, the weather & # 39; those storms & # 39; insane drill. Equipped with & # 39; this new knowledge, engineers can develop materials more resistant to erosion, both for space and terrestrial applications.
Obviously there is a bit more research to be done. The team used only tin, and b & # 39; angle & # 39; direct impact. Probably there is a slightly different effects for different materials – b & # 39; & # 39 different levels, stiffness or hardness, and points & # 39; different melting (tin is quite low), and angles & # 39; diverged.
But this first step, when it shows that the experimental testbed setup and can & # 39; is used to capture and analyze that moment & # 39; impact, is very impressive.
"We can extend this to any situation where erosion is important", said the MIT engineer David Veysset.
The team's research was published in the journal Nature Communications.