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Fast Cure Liquid Shim Materials with Long Term Durability and Fatigue Resistance

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Fast Cure Liquid Shim Materials with Long Term Durability and Fatigue Resistance

 

Structural bonding is important for aerospace applications due to the high mechanical strength and long durability requirements. For example, the rib to skin assembly in wing construction undergoes high stress during every take-off and landing, as well as during flying through high turbulence. In many assembly applications it is necessary to use ‘liquid shim’ materials to ensure a good fit between the parts being joined. Structural liquid shim materials must accommodate a variable gap between the parts being joined, provide mechanical integrity through more than 1,000,000 stress-relaxation cycles, withstand a wide range of service conditions and be capable of meeting green strength requirements in a short-time to expedite the assembly process. The nature of these requirements and the high stress/strain displacement pose new challenges for material developers to design high performance materials.In developing a new generation of liquid shim materials Henkel Aerospace has taken fatigue testing into consideration early in the process, along with the overall balance of faster cure, high service temperature, mechanical performance and long-term durability. The network formation of these two-part epoxy systems, optimum balance of cure/working life, and micro- and macro- scale stress-relaxation behavior will be discussed. The fit for high throughput production, ability to fill thick gaps up to 3 mm and use in composite joining applications, as well as the subsequent long term fatigue and thermal cycling performance will also be presented.

 

Authors: Sara Zhang, Ruairí O’Kane, Adam Meng, Nicolas Dominguez, Bill Torres, Erwin Duinker, and Juergen Becher

 

 Conference: SAMPE Seattle 2017

 

SKU/Code: SE17--0642

Pages: 12

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