Lowering Thermal Residual Stresses in Composite Patch Repairs in Metallic Aircraft Structure

AIAA Journal ◽  
2001 ◽  
Vol 39 (10) ◽  
pp. 2013-2018 ◽  
Author(s):  
J. Cho ◽  
C. T. Sun
Keyword(s):  
Residual Stresses ◽  
Aircraft Structure ◽  
Composite Patch ◽  
Thermal Residual Stresses ◽  
Patch Repairs

General Method for Optimizing Composite Patch Repairs

2015 ◽  
Vol 1120-1121 ◽  
pp. 670-674
Author(s):  
Abdelmadjid Ait Yala ◽  
Abderrahmanne Akkouche
Keyword(s):  
Mechanical Properties ◽  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Optimization Problem ◽  
Composite Patch ◽  
Matlab Program ◽  
Patch Repairs ◽  
Selection Of ◽  
General Method

The aim of this work is to define a general method for the optimization of composite patch repairing. Fracture mechanics theory shows that the stress intensity factor tends towards an asymptotic limit K∞.This limit is given by Rose’s formula and is a function of the thicknesses and mechanical properties of the cracked plate, the composite patch and the adhesive. The proposed approach consists in considering this limit as an objective function that needs to be minimized. In deed lowering this asymptote will reduce the values of the stress intensity factor hence optimize the repair. However to be effective this robust design must satisfy the stiffness ratio criteria. The resolution of this double objective optimization problem with Matlab program allowed us determine the appropriate geometric and mechanical properties that allow the optimum design; that is the selection of the adhesive, the patch and their respective thicknesses.

scholarly journals Thermal Residual Stresses in Bonded Dissimilar Materials and Their Singularities

1996 ◽  
Vol 39 (2) ◽  
pp. 197-203 ◽  
Author(s):  
Seiji IOKA ◽  
Shiro KUBO ◽  
Kiyotsugu OHJI ◽  
Jun-ichi KISHIMOTO
Keyword(s):  
Residual Stresses ◽  
Dissimilar Materials ◽  
Thermal Residual Stresses

Prediction of Process Induced Thermal Residual Stresses in Injection Molded Composites

1989 ◽  
Vol 2 (4) ◽  
pp. 319-333 ◽  
Author(s):  
Rushad F. Eduljee ◽  
John W. Gillespie ◽  
Roy L. Mccullough
Keyword(s):  
Residual Stresses ◽  
Thermal Residual Stresses ◽  
Injection Molded
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