Composite Structure Repair - Carbon Core (Thermoset Resin) Structure
Composite Structure Repair - Carbon Core (Thermoset Resin) Structure
(OP)
Dear fellow engineers,
I hope everyone is keeping well and safe. I was recently looking at damage on a carbon core structure where the damage seems to be quite severe and would most likely lie outside of the SRM. Can you suggest a good reference or guide, which shares examples of failures of composite carbon fiber thermosetting structures and suggests industry-wide accepted repair schemes for them?
Thanks
Regards,
Sam
I hope everyone is keeping well and safe. I was recently looking at damage on a carbon core structure where the damage seems to be quite severe and would most likely lie outside of the SRM. Can you suggest a good reference or guide, which shares examples of failures of composite carbon fiber thermosetting structures and suggests industry-wide accepted repair schemes for them?
Thanks
Regards,
Sam
RE: Composite Structure Repair - Carbon Core (Thermoset Resin) Structure
The FAA has done plenty research and published guidance to support the certification of composite structural repairs.
Found some:
DOT/FAA/AR-00/46 Repair of Composite Laminates (Office of Aviation Research, Washington, D.C. 20591)
AC 21-26 "Quality Control for the Manufacture of Composite Structures" [6/89]
AC 21-31 "Quality Control for the Manufacture of Non-Metallic Compartment Interior Components" [11/91]
AC 23-15A “Small Airplane Certification Compliance Program” [12/03]
AC 23-20 "Acceptance Guidance on Material Procurement and Process Specifications for Polymer Matrix Composite Systems" [9/03]
AC 25.571-1C “Damage Tolerance and Fatigue Evaluation of Structure” [4/98]
AC 29 MG 8 “Substantiation of Composite Rotorcraft Structure” [4/06]
AC 35.37-1A "Guidance Material for Fatigue Limit Tests and Composite Blade Fatigue Substantiation" [9/01]
AC 145-6 "Repair Stations for Composite and Bonded Aircraft Structure" [11/96]
EUROCAE ED-113 Aircraft Lightning Direct Effects Certification
FAA Technical Report “Aircraft Lightning Protection Handbook” (DOT/FAA/CT- 89/22).
FAA Policy Statement "Static Strength Substantiation of Composite Airplane Structure" [PS-ACE100-2001-006, December 2001]
FAA Policy Statement "Final Policy for Flammability Testing per 14 CFR Part 23, Sections 23.853, 23.855 and 23.1359" [PS-ACE100-2001-002, January 2002]
FAA Policy Statement “Material Qualification and Equivalency for Polymer Matrix Composite Material Systems" [PS-ACE100-2002-006, September 2003]
FAA Policy Statement “Bonded Joints and Structures - Technical Issues and Certification Considerations” [PS-ACE100-2005-10038, September 2005]
www.sparweb.ca
RE: Composite Structure Repair - Carbon Core (Thermoset Resin) Structure
B.E.
You are judged not by what you know, but by what you can do.
RE: Composite Structure Repair - Carbon Core (Thermoset Resin) Structure
the only chance you have is if this is a piece of secondary structure, where of course the consequences of failure are less critical and so the opportunity for "hand waving" presents itself. I'm not saying this is a good course of action, you'll still need an RDA (certification for your repair) and so convince someone else that your "hand waving" is "good enough" … not easy, but possibly not impossible.
can you scrap the part and get a new one ? Probably an OEM repair is the best option ?
another day in paradise, or is paradise one day closer ?
RE: Composite Structure Repair - Carbon Core (Thermoset Resin) Structure
RE: Composite Structure Repair - Carbon Core (Thermoset Resin) Structure
RE: Composite Structure Repair - Carbon Core (Thermoset Resin) Structure
another day in paradise, or is paradise one day closer ?