Estimation of Residual Life and Failure Mechanism of Cracked Aircraft Wing Skin

2020 ◽  
pp. 493-513
Author(s):  
Mahantesh Hagaragi ◽  
M. Mohan Kumar ◽  
Ramesh S. Sharma
Keyword(s):  
Failure Mechanism ◽  
Residual Life ◽  
Aircraft Wing ◽  
Wing Skin

Mixed Mode Stress Intensity Factor Determination for Single and Multiple Cracks in an Aircraft Wing

2014 ◽  
Vol 592-594 ◽  
pp. 2528-2533
Author(s):  
S. Suresh Kumar ◽  
V. Veeraraghavan ◽  
M. Vimalesh ◽  
Sanjay B. Bharadwaj
Keyword(s):  
Lift Force ◽  
Residual Life ◽  
Fatigue Cracks ◽  
Crack Depth ◽  
Bottom Surface ◽  
Multiple Cracks ◽  
Aircraft Wing ◽  
Aspect Ratios ◽  
Depth Ratio ◽  
Crack Depth Ratio

Structural failure of aircraft wings due to nucleation and propagation of cracks is one of the main reasons for failure of aged aircrafts. Reported studies on aircraft failures indicate that the main cause of wing failure is due to fatigue cracks which nucleate from the wing root region. Thus, determination of residual life of the cracked wing structure using fracture mechanics approach becomes important. In the present work an attempt has been made to estimate the SIF of single and multiple cracks in an aircraft wing subjected to lift force. Crack depth ratios ranging between 0.1 and 0.4 and aspect ratios of 0.6 and 1.0 have been considered. Single and multiple cracks are introduced at the wing rib region and the lift force is applied at the bottom surface of the wing. Geometric correction factor (Y) is estimated with the additional consideration of mode II and mode III fracture. The effect of crack depth ratio and number of cracks on SIF is determined. Non symmetric SIF distribution is observed with increase of crack depth ratio. It is also noted that SIF values are always higher at the crack surface region compared to crack middle region irrespective of crack depth ratio.

Positioning method and assembly precision for aircraft wing skin

2016 ◽  
Vol 232 (2) ◽  
pp. 317-327 ◽  
Author(s):  
Feiyan Guo ◽  
Zhongqi Wang ◽  
Yonggang Kang ◽  
Xining Li ◽  
Zhengping Chang ◽  
...  
Keyword(s):  
Low Cost ◽  
Aircraft Wing ◽  
Flexible Assembly ◽  
Assembly Accuracy ◽  
Positioning Method ◽  
Airplane Wing ◽  
Wing Skin ◽  
Tooling System ◽  
Assembly Precision ◽  
Aerodynamic Configuration

To an aircraft, the accuracy of aerodynamic configuration has a direct influence on flight performance. To improve the assembly accuracy of aircraft wing components, two kinds of positioning method and the corresponding assembly precision are studied, and a low-cost flexible assembly tooling system for different wing components is proposed. First, the article analyzes the technological characteristics of airplane wing skin and determines the assembly requirement. Second, positioning method based on contour boards and coordination holes and their assembly precision are researched. Third, to verify the positioning method and the algorithm of assembly precision calculation based on coordination holes, a locating unit with three motion axes is designed and manufactured. Fourth, experimental verification is done and the corresponding results are analyzed. Experiment results showed the assembly precision based on coordination holes has an improvement of 24% contrasting with the precision based on contour boards, and the assembly productivity is increased by 60%. The flexible assembly tooling system also has a demonstration effect for other flexible assembly tooling within the aerospace industry.

Aircraft wing skin contouring by shot peening

1991 ◽  
Vol 9 (2) ◽  
pp. 89-101 ◽  
Author(s):  
S. E. Homer ◽  
R. D. Van Luchene
Keyword(s):  
Shot Peening ◽  
Aircraft Wing ◽  
Wing Skin

On the role of tin underlays for the prevention of thermal grooving in thin gold films

1986 ◽  
Vol 44 ◽  
pp. 732-733
Author(s):  
Jin Young Kim ◽  
R. E. Hummel ◽  
R. T. DeHoff
Keyword(s):  
Thin Film ◽  
Free Surface ◽  
Grain Boundary ◽  
Beneficial Effect ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Distinct Advantage ◽  
Gold Films ◽  
Gold Thin Film

Gold thin film metallizations in microelectronic circuits have a distinct advantage over those consisting of aluminum because they are less susceptible to electromigration. When electromigration is no longer the principal failure mechanism, other failure mechanisms caused by d.c. stressing might become important. In gold thin-film metallizations, grain boundary grooving is the principal failure mechanism.Previous studies have shown that grain boundary grooving in gold films can be prevented by an indium underlay between the substrate and gold. The beneficial effect of the In/Au composite film is mainly due to roughening of the surface of the gold films, redistribution of indium on the gold films and formation of In2O3 on the free surface and along the grain boundaries of the gold films during air annealing.

Analysis of Drag for an Aircraft Wing Model with and without Winglet

2011 ◽  
Vol 1 (7) ◽  
pp. 89-91
Author(s):  
Mitul Patel ◽  
◽  
Sharvil Shah ◽  
Dharmendra Dubey
Keyword(s):  
Aircraft Wing ◽  
Wing Model

A method of technical diagnostics for offshore structures

1994 ◽  
Vol 16 (2) ◽  
pp. 43-48
Author(s):  
Do Son
Keyword(s):  
Diagnostic Method ◽  
Joint Venture ◽  
Oil And Gas ◽  
Residual Life ◽  
Life Time ◽  
Offshore Structures ◽  
Technical Diagnostics ◽  
Offshore Platforms ◽  
South Vietnam ◽  
Local Destruction

This paper describes the results of measurements and analysis of the parameters, characterizing technical state of offshore platforms in Vietnam Sea. Based on decreasing in time material characteristics because of corrosion and local destruction assessment on residual life time of platforms is given and variants for its repair are recommended. The results allowed to confirm advantage of proposed technical diagnostic method in comparison with others and have been used for oil and gas platform of Joint Venture "Vietsovpetro" in South Vietnam.

ABOUT METHODS OF DETEMINING BUFFET ONSET BOUNDARY FOR A PASSENGER AIRCRAFT WING

2018 ◽  
Vol 49 (8) ◽  
pp. 809-823
Author(s):  
Nikolay Nikolaevich Bragin
Keyword(s):  
Aircraft Wing ◽  
Passenger Aircraft
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