Patent ID: 11904589
Assignee: THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY
Field: Surface technology, coating (Chemistry)
Classification: CPC B | IPC B

Claim 19:
20. A method of forming a square symmetric composite laminate structure, the method comprising the steps of:
forming a first ply layer by dispensing a first set of first elongate tapes oriented in a first direction and a second set of second elongate tapes oriented in a second direction, a first sum of the first and second directions being 90 degrees, and
forming a second ply layer by dispensing a third set of first elongate tapes oriented in a third direction and a fourth set of second elongate tapes oriented in a fourth direction, a second sum of the third and fourth directions being 90 degrees,
wherein:
the first and second directions are different than the third and fourth directions, respectively;
the first ply layer has a layup of [Φ/(π/2−Φ)] and the second ply layer has a layup of [−Ψ/−(π/2−Ψ)]; and
the second elongate tape is positioned adjacent the third elongate tape and the second and third elongate tapes are both positioned intermediate the first and fourth elongate tapes, thereby defining a double-double helix arrangement of the respective elongate tapes forming the first and second ply layers.