What Happens When Layered Materials Are Put Under Pressure

Posted: Jan 5 2019, 9:10am CST | by , Updated: Jan 5 2019, 9:17am CST , in Latest Science News


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What Happens When Layered Materials are Put Under Pressure
Credit: Drexel University

New study shows that layered materials create ripples or internal waves when they are pushed to the brink.

Materials can bend, twist and break. Deformation mechanisms of the material have fascinated researchers for years but their details are not entirely known. By studying the behavior of a deck of cards or stacks of materials like steel and aluminum, researchers shed new light on the internal behavior of layered materials under pressure. They suggest that layered materials from playing cards to tectonic plates create a certain kind of waves or ripples as they deform. The internal waves that happen inside layered materials when they are put under pressure are called ripplocations.

The phenomenon was first documented in 2016, but new study proves the existence of this structural deformation mechanism in layered materials. Researchers have for the first time accomplished the detailed high-speed imaging of internal waves or ripplocations that can potentially explain how the process works.

"What we did here was show that ripplocations exist at the macro level and then modeled them at the atomic level, and showed that the response was basically the same.” said lead author Michel Barsoum from Drexel's College of Engineering. "This is the first time ripplocations have been seen in action and helped us understand why they are reversible"

Ripplocation behavior shows that layered solid materials return to their original form after they squeezed. Barsoum has described this effect as "kinking non-linear elasticity” and ran atomistic simulations on bulk samples to explain the phenomenon. In order to better understand the actual mechanism, researchers observed internal waves in layered materials with naked eye.

"The experiment we carried out is quite simple actually. In one case, we confined a deck of cards from the sides and pushed on them from the top. At a given load, buckling occurs, but because the deck is confined, they behave as waves that are fully reversible,"

Researchers also observed that height of the ripples or amplitude increased as more load applied.

"This paper shows that ripplocations are scale independent," said Barsoum. "This first investigation showed that ripplocations exist and are more or less fully reversible and that they dissipate energy in a manner that we have observed in layered solids at the atomic scale for more than a decade now. But demonstrating the same behavior in layered materials that we can see directly, is an important step toward proving that the behavior happens in materials of all sizes."

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The Author

<a href="/latest_stories/all/all/47" rel="author">Hira Bashir</a>
The latest discoveries in science are the passion of Hira Bashir (). With years of experience, she is able to spot the most interesting new achievements of scientists around the world and cover them in easy to understand reporting.




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