US Navy developing 3D printable energetics (propellants, explosives)

[JRT]

Printable Explosives? The Latest in Additive Manufacturing
Published on 31 May 2016

What if you could print explosives when and where you needed them? Scientists at Naval Air Warfare Center, China Lake are exploring this possibility, its process, and how it would work.

"Ideally, we would fully develop an end item and then we could send that out to the fleet and they would be able to print them," said Dr. Andrew Ihnen, material scientist at Naval Air Warfare Center Weapons Division.

The impact is getting products/weapons to our warfighters faster, production stability, and independence from the logistics trail.

"Things that I couldn't imagine doing five years ago are now possible," said Dr. Jeff Davis, Head of Energetics Research Division at China Lake. "Ten years from now, who knows what it's going to look like. We are just scratching the surface."

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[Monash]

You have to wonder what the advantages would be over explosives/propellants produced on conventional production lines via conventional processes. As far as I can see you'd still have to transport the raw materials to the printers wherever they were located, so I don't necessarily see it being a big advantage in terms of logistics. Printed parts and components for weapons, vehicles and equipment yes. Explosives not so much and that is because the you could in theory transport a few different types of bulk metallic/polymer powders etc and via an on-site printing produce literally thousands of different components on demand for hundreds of different systems.

With explosives etc all you can print is, well a strictly limited range explosives - the process is still basically linear i.e. the number of different 'outputs' vs inputs is limited. If they are more energetic all to the good but if so printing them at the factory back home still basically makes as much sense as doing it closer to the 'front' or wherever.

[JRT]

UK Defence Agency Plans to 3D Print High Explosives

by Michael Petch
16 March 2020

The Defence Science and Technology Laboratory (DSTL), an executive agency sponsored by the Ministry of Defence (MOD) of the UK, has started to develop 3D printed explosives.

The project aims to create new possibilities for various explosive effects using intricate designs enabled by 3D printing, and also to reduce transportation and storage costs.

Applying additive manufacturing to produce new energetic formulations is part of the MOD’s Future Energetics Project, established to train experts and develop new technologies.

The Future Energetics Project

DSTL aims to ensure the contribution of innovative science and technology in the defense and security sector of the UK. Recognizing the importance of energetic experts for the security sector, the Ministry of Defence has established the Future Energetics Project in 2015. Since then, MOD has invested nearly £10 million in training experts, developing technologies and equipment.

DSTL states, “Energetics knowledge and experience is vital for the UK to develop the best equipment, platforms and operational assets. We need to know how energetic systems damage or defeat our platforms and how we can counter threats, so we can advise on things like countermeasures, detection, safety, transportation and disposal, all while working with explosives in accordance with legislation.”

The Future Energetics Project includes blast modeling, explosive trials, chemical synthesis, novel energetics manufacture, and small-scale hazard testing. To develop new energetic materials and methods, scientists of the project have started to implement additive manufacturing.

Applying 3D printing to produce explosive formulations, is currently being tested. Since the different explosive effects are influenced by the geometry of the charge, scientists of this project examine the energetic characteristics, enabled to develop by additive manufacturing.

Focusing on material extrusion and printer capabilities, the project aims to develop individual shapes for warzone missions. 3D printing customized charges on-demand may also reduce the cost of transportation and material usage.

A statement from DSTL explains, “Having this capability also means we can rigorously test and evaluate vehicles and systems against current and emerging threats to ensure they offer the required protection for armed forces. We also need to be able to support the police and counter-terrorism units who deal with explosions and homemade devices, such as the Manchester bombing in 2017.”

To make the process of mixing high explosive materials safer, DSTL uses acoustic energy instead of physical blades. Therefore, formulations are manufactured in a LabRAM resonant acoustic mixer.

Further work in 3D printing explosives

To reduce cost and improve weaponry efficiency, the Australian government has awarded USD $2 million to research institutions to develop methods to 3D print energetic materials. Professor David Lewis, a polymer specialist at the awarded Flinders University, said, “The ability to develop systems like this is the next generation of additive manufacturing and is the key to this technology becoming mainstream.”

In Indiana, professors of Purdue University have 3D printed energetic materials without voids. Professor Jeffrey Rhoads commented, “We have shown that we can print these energetic materials without voids, which is key. Voids are bad in energetic materials because they typically lead to inconsistent, sometimes catastrophic burns.”

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