Composite Repairs of Cracked Metallic Aircraft Structure

Atluri, S. N.; Park, J. H.; Punch, E. F.; O'Donoghue, P. E.; Jones, Rhys

i

Composite Repairs of Cracked Metallic Aircraft Structure

1993-05-01
By Atluri, S. N. ; Park, J. H. ; Punch, E. F.

File Language:

English

Details

Creators:

Atluri, S. N. ; Park, J. H. ; Punch, E. F. ; O'Donoghue, P. E. ; Jones, Rhys
Corporate Creators:

Knowledge Systems Inc ; Aeronautical Research Laboratories
Contributors:

Oplinger, Donald W.
Corporate Contributors:

United States. Department of Transportation. Federal Aviation Administration. Technical Center
Subject/TRT Terms:
Publication/ Report Number:

DOT/FAA/CT-92/32
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Final Report
Corporate Publisher:

United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center
Abstract:

This report summarizes work that quantifies the benefits of composite patch repairs on cracked metallic aircraft structures. The first chapter describes a data base on bonding methods and repair materials that can be used in design and analysis. In the second chapter, analytical models are derived for the stress intensity factor of cracks in metallic sheets with bonded orthotropic repairs. Specific configurations included through-the-thickness center cracks, through-the-thickness cracks at a loaded fastener hole, surface cracks, and surface cracks at a hole. These analyses can be used in calculations of crack growth life extension resulting from the bonded repairs. Four types of specimens were tested in fatigue to verify the increase in fatigue life. The four configurations were edge crack specimens, surface crack specimens, surface crack at hole specimens, and simulated lap joint specimens with multiple site damage (MSD). All experiments confirmed that bonded composite repairs could significantly increase fatigue life. An update is also included on a flight demonstration program in which composite patches were placed on undamaged sections of an in-service aircraft. Preliminary results on the durability of the patches are promising.
Format:

PDF
Funding:

DTRS-57-89-C-00008
Download URL:

https://rosap.ntl.bts.gov/view/dot/93346/dot_93346_DS1.pdf
File Type:

[PDF - 5.56 MB]
Collection(s):

FAA William J. Hughes Technical Center for Advanced Aerospace
Main Document Checksum:

urn:sha-512:23538eb0f25f4ba9cebaa2677949511f4e39a7182fe55d7a8c0f5d6305edbf17d81de97e9d5918ec8b29455d446c7089a3a7892bfac5a1c603f1566d2a3178b0

File Language:

English

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