Study analyzes the keys to fragmentation of metallic materials

April 10, 2018, Carlos III University of Madrid
Example of fragmentation at metallic materials. Credit: UC3M

Scientists have analyzed the mechanisms behind the dynamic fragmentation of ductile metallic materials that exhibit large permanent deformations when subjected to severe mechanical loading. Previously, it was thought that dynamic fragmentation was triggered by the inherent defects of the material. What this research suggests is that the key mechanism may not be the porosity of the metallic material, but inertia effects.

One of the authors of the study, Komi Espoir N"Souglo, says, "We have developed a simple analytical model to shed light into the mechanisms which control dynamic in porous metals used in the aerospace industry and the civilian-security sector."

Co-author José Antonio Rodríguez from the Department of Continuum Mechanics and Structural Analysis says, "This work provides a new approach for analyzing and designing structures for which it is important to predict and control the size of the fragments that form when a metallic material fractures under impact loading." The paper was published in the journal Proceedings of the Royal Society A.

Possible applications

The identification of the mechanisms controlling dynamic fragmentation of a protective structural material will lead to the optimization of manufacturing processes, reducing costs and improving the quality of the final products. For example, protective structures of industrial facilities such as need to withstand extreme mechanical loads such as explosions and impacts without fragmenting, thus maintaining their load-carrying capacity. "This knowledge can also be applied in the design of structures that can easily be fragmented, as in the case of that sometimes falls to the earth's surface. In this case, the aim is that during atmospheric re-entry, the space debris will be fragmented so that the structures that eventually reach the Earth's surface are not of a large size," the researchers explain.

Explore further: Image: Satellite panel following reentry testing

More information: K. E. N'souglo et al, Random distributions of initial porosity trigger regular necking patterns at high strain rates, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Science (2018). DOI: 10.1098/rspa.2017.0575

Related Stories

Image: Satellite panel following reentry testing

March 21, 2018

Ideally, no parts of a reentering satellite would survive their fiery return through the atmosphere, so testing is being used to understand how satellites break apart as they fall.

Toward designing/controlling flexibility of MOFs

December 27, 2017

Porous coordination polymers (PCPs) or metal-organic frameworks (MOFs) have been extensively studied for their diversified and designable/tailorable framework and pore structures. Compared with conventional porous materials, ...

New technology for producing porous aluminum

July 18, 2017

A new technology of producing an unsinkable aluminum alloy was developed at Peter the Great St. Petersburg Polytechnic University (SPbPU). Porosity is produced by the addition of foaming gas into liquid aluminum during re-melting. ...

Observing fracture in stressed materials

July 24, 2017

Ever wondered, while cruising at 36,000 feet over the Atlantic, what would happen if a piece of satellite, asteroid, or other debris collided with your aircraft?

Researchers develop model for lighter armor

August 17, 2017

The US Army Research Laboratory is working on developing new light-weight ceramic materials that resist fracture, and has teamed with researchers from the University of Florida to better understand exactly how these materials, ...

Recommended for you

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.