Material looks set to make cars lighter, safer and even cheaper
11 May 2018

Composite car components that use graphene are expected to make it to market in seven to eight years and could lead to the development of much lighter, more energy-efficient cars.

That’s the expectation of the University of Sunderland, which is spearheading a consortium promoting the revolutionary material. It is currently running a pilot plant in Japan.

Scientists at the university have been working on graphene — which, when added to carbon-reinforced plastic in a certain way, means a bumper made using the material is capable of absorbing 40% more energy than the standard item. This could lead to the creation of significantly lighter, safer cars.

A number of organisations have recognised the potential of graphene in recent years. Goodyear talked about using it to create tiny sensors in the tread of its Eagle 360 spherical tyre concept, shown in 2016. The Advanced Propulsion Centre in Warwick recently held a seminar that brought together experts to discuss the potential of graphene, which was first isolated at the University of Manchester in 2004.

However, the University of Sunderland claims to be the first to physically test the technology, rather than simply theoretically table it, and has gone so far as to begin patent applications for certain parts of the process.

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Graphene is produced by breaking down graphite, the same material used in pencils, to produce a material one-atom thick, or one million times thinner than a human hair. When turned into a powder, small amounts can be blended with the thermoset resin used to impregnate carbonfibre while it is still in liquid form.

The same technique can be used with thermoplastic material, which can be moulded when hot and becomes hard when cooled. In that case, the graphene is mixed with the plastic when it is melted.

When used in any kind of a crash structure or bumper, carbonfibre absorbs energy as it fragments. The addition of graphene in the right quantity improves this characteristic and gives the material other properties, too.

“The combination of materials creates a kind of toughness that absorbs some load, so it’s somewhere between carbonfibre and metal,” said Ahmed Elmarakbi, professor of automotive composites at the University of Sunderland (pictured above). The process can be used with glass-reinforced plastic (glassfibre) as well.

The final bumper design by the university was created with two components. The outer shell was made from a carbonfibre-reinforced epoxy resin and graphene mix. Strengthening ribs were made from glassfibre, reinforced with thermoplastic mixed with graphene.

“Whatever we’re using now, we can use much less of it,” said Elmarakbi. “Where there are many layers of laminate, we can get better performance using graphene. If we want the same performance, we can use fewer layers.

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“As well as reducing weight, this could lead to carbonfibre components becoming much more cost effective by reducing the amount of carbonfibre needed to make them.”

There are still some challenges in readying the material for production. Mixing the graphene powder evenly throughout the polymer is important because clumps of graphene can weaken the finished item and patents have been applied for in this area. Using too much graphene can make a component too strong, transmitting too much energy rather than absorbing it, and too little can make it too weak.

Once perfected, the material can potentially be used in various applications. “It can replace many different parts of the vehicle,” said Elmarakbi. “Structural components, doors, chassis — any part of the structure made of steel or aluminium could be replaced.”

The material can also be used to manufacture lightweight batteries. “We could build a battery 50% of the size and get the same capacity,” said Elmarakbi. The high-energy-density, lightweight battery would also be far cheaper to make, with some components costing up to 90% less.

Other parties in the consortium led by the University of Sunderland include five European partners, while Centro Ricerche Fiat, part of Fiat Chrysler Automobiles, also lent support.

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Comments
9

11 May 2018

Any other inventions to make cars cheaper and better? We could do with a breakthrough in engines to improve efficiency and performance.

11 May 2018

For over 10 years I ve been reading about how graphene could revolutionise many things, including replace silicon in computers, but so far didly squat has happened. As for carbon fibre I cant understand why its still so expensive - its been around for years, carbon is a very abundant element and resin isnt exactly expensive either.

XXXX just went POP.

11 May 2018
typos1 wrote:

For over 10 years I ve been reading about how graphene could revolutionise many things, including replace silicon in computers, but so far didly squat has happened. As for carbon fibre I cant understand why its still so expensive - its been around for years, carbon is a very abundant element and resin isnt exactly expensive either.

They have also not long found how to effectivley filter water with graphene

11 May 2018

Graphene has been touted as a miracle cure for a long time, can't think off-hand of any developments that could be described as "game-changing"

11 May 2018

 Yes, sounds like just the ticket, light strong, can be incorporated into numerous areas of the automotive industry, but, would it really lower Car prices?, I agree also that Carbon fibre has been around for at least 40 years and it still isn’t cheap as Chips, why is that?.......

Peter Cavellini.

11 May 2018
Peter Cavellini wrote:

 Yes, sounds like just the ticket, light strong, can be incorporated into numerous areas of the automotive industry, but, would it really lower Car prices?, I agree also that Carbon fibre has been around for at least 40 years and it still isn’t cheap as Chips, why is that?.......

The actual carbon fibres are still expensive to manufacture but, new processes that should be cheaper and "greener" are, apparently, on the way.

Citroëniste.

11 May 2018
I'd like to know how energy-intensive the large-scale production of graphene would be and how that energy would be produced.

11 May 2018
Graphene is a ground breaking material and has many potential uses but at present,the two primary methods of production have distinct shortcomings and the one that could offer large scale production, can result in structural instability....which sort of defeats the object.

Creation of a hybrid polymer could be a good route, blending the properies of both materials in smaller quantities, so this sounds promising.

TBC

12 May 2018

Although the overall weight of new cars has increased markedly in the last 40 years, and it's a good target for the manufacturers keen to lower said weight. The reality is that in 40 years time, all new vehiles will be full electric. So the real breakthrough here is buried down in the second to last paragraph. A Tesla model S with a 100KWh graphene battery pack would weigh almost 300kg less than the current lithium unit (and still supply the same range). If you want to save weight, look no further...............

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