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Glass mat reinforced thermoplastic composite material (Glass Mat Reinforced Thermorplastic, referred to as GMT) refers to a novel, energy-saving and lightweight composite material with thermoplastic resin as matrix and glass fiber mat as reinforced skeleton.
It is currently an extremely active composite material in the world.
The variety of material development is regarded as one of the new materials of the century
.
GMT can generally produce semi-finished sheet materials, which are then directly processed into products of the desired shape
.
Figure Lightweight and high-strength GMT material source: Hanwha official website
1.
The advantages of GMT materials
The advantages of GMT materials
High specific strength: The strength of GMT is similar to that of hand-laid polyester FRP products, and its density is 1.
01-1.
19g/cm, which is smaller than that of thermosetting FRP (1.
8-2.
0g/cm), so it has higher specific strength
.
Lightweight and energy-saving: the dead weight of the car door made of GMT material can be reduced from 26Kg to 15Kg, and the thickness of the back can be reduced to increase the car space, and the energy consumption is only 60-80% of the steel product and 35-50% of the aluminum product.
%
.
Compared with thermosetting SMC (sheet molding compound), GMT material has the advantages of short molding cycle, good impact performance, recyclability and long storage cycle
.
Impact performance: GMT's ability to absorb shock is 2.
5-3 times higher than that of SMC.
Under the action of impact force, SMC, steel and aluminum all have dents or cracks, while GMT is safe
.
High Rigidity: The GMT contains GF fabric that retains its shape even with a 10mph impact
.
Second, the application of GMT materials in the automotive field
Second, the application of GMT materials in the automotive fieldGMT sheet has high specific strength and can be made into lightweight parts.
At the same time, it has high design freedom, strong collision energy absorption and good processing performance.
It has been widely used in the automobile industry abroad since the 1990s
.
At present, GMT materials are widely used in the automotive industry, mainly including seat frames, bumpers, dashboards, hoods, battery brackets, foot pedals, front ends, floors, fenders, rear doors, roofs, luggage Brackets, sun visors, spare tire racks,
etc.
Figure Hanwha Advanced GMT application in automobiles Source: Hanwha official website
1.
Seat frame
The second-row seatbacks on the Ford Motor Company 2015 Ford Mustang Roadster were compression molded by Tier 1 supplier/fabricator Continental Structural Plastics using Hanwha L&C's 45% unidirectional glass fiber reinforced fiberglass mat thermoplastic composite (GMT ) and Century Tool & Gage's tooling, compression molding, successfully met the very challenging European safety regulations ECE for holding luggage under load
.
The part required more than 100 FEA iterations to complete, eliminating five parts from an earlier steel design and saving 3.
1kg per vehicle in a thinner structure that is also easier to install
.
Image of the second-row seat backs of the Ford Motor Company 2015 Ford Mustang Roadster Source: SPE & Ford
2.
Rear anti-collision beam
The anti-collision beam at the rear of the 2015 Hyundai new Tucson is the material used by GMT.
Compared with steel products, it is lighter in weight and has better cushioning performance.
It reduces vehicle weight and fuel consumption while ensuring safety performance
.
Source: Auto Home
3.
Front-end module
Mercedes-Benz has selected Quadrant Plastic Composites GMTex™ fabric-reinforced thermoplastic composites for front-end modular elements in its S-Class luxury coupe
.
Figure Mercedes S-Class Coupe front-end module Source: PressReleaseFinder
4.
Body under guard
Underbody hood protection manufactured by Quadrant Plastic Composites with high-performance GMTex™ is applied to the Mercedes Off-Road Special Edition
.
Figure Body Guard Source: PressReleaseFinder
5.
Tailgate skeleton
In addition to the usual advantages of functional integration and weight reduction, the GMT tailgate structure enables the formability of the GMT to enable product forms that are not possible with steel or aluminum, and are used in Nissan Murano, Infiniti FX 45 and other models
.
Figure GMT material tailgate skeleton Source: PressReleaseFinder
6.
Dashboard Framework
GMT's new concept of making dashboard frames has been used on several Ford Group models: the Volvo S40 and V50, the Mazda 3 and the Ford C-Max
.
These composite materials enable a wide range of functional integrations, especially by incorporating vehicle crossmembers in the form of thin steel tubes in moulded parts, and are significantly lighter in weight compared to conventional methods without adding cost
.
Figure GMT Manufacturing Dashboard Framework Source: PressReleaseFinder
7.
Battery holder
Figure GMT-manufactured battery bracket Source: Mitsubishi Chemical Advanced Materials official website
