Composite laminate with self-healing layer
A composite structure comprising: a first stack comprising a plurality of plies of composite material and at least one ply of self-healing material, the ply of self-healing material comprising a plurality of containers each containing a curable healing liquid; and a second stack comprising a plurality of plies of composite material, the stacks being joined together at a bond line. By placing a ply of self-healing material in one of the stacks (preferably relatively close to the bond line) the ply of self-healing material can resist the propagation of cracks between the first stack and the second stack. Preferably the global strength of the first stack is greater than the global strength of the second stack.
1. A composite laminate structure comprising: a stack of plies of composite material, each ply of composite material comprising a plurality of reinforcement fibres embedded within a matrix; and one or more plies of self-healing material embedded within the stack of plies of composite material, each ply of self-healing material comprising a plurality of containers each containing a curable healing liquid, wherein the stack has a total thickness T 2 and the plies of self-healing material have a total thickness T 1 , and wherein the ratio T 1 /T 2 is less than 0.1.
2. The structure of claim 1 wherein the containers are formed from a glass material.
3. The structure of claim 1 wherein the containers and the reinforcement fibres are formed from different materials.
4. The structure of claim 1 wherein the ply of self-healing material further comprises a plurality of containers each containing a hardener liquid which cures the curable healing liquid on contact with the curable healing liquid.
5. The structure of claim 1 wherein the reinforcement fibres are carbon fibres.
6. The structure of claim 1 wherein the ratio T 1 /T 2 is less than or equal to 0.05.