Damage Tolerance in Composite Structures

2008 ◽  
pp. 255-266
Keyword(s):  
Composite Structures ◽  
Damage Tolerance

Integrally-Stiffened Composite Damage Tolerance Evaluated by Computational Simulation

2001 ◽  
Author(s):  
Christos C. Chamis ◽  
Levon Minnetyan
Keyword(s):  
Material Properties ◽  
Composite Structures ◽  
Failure Modes ◽  
Damage Tolerance ◽  
Epoxy Composite ◽  
Computational Simulation ◽  
Computer Code ◽  
Simulation Design ◽  
Damage Initiation ◽  
Composite Damage

Abstract An integrally stiffened graphite/epoxy composite rotorcraft structure is evaluated via computational simulation. A computer code that scales up constituent micromechanics level material properties to the structure level and accounts for all possible failure modes is used for the simulation of composite degradation under loading. Damage initiation, growth, accumulation, and propagation to fracture are included in the simulation. Design implications with regard to defect and damage tolerance of integrally stiffened composite structures are examined. A procedure is outlined regarding the use of this type of information for setting quality acceptance criteria, design allowables, damage tolerance, and retirement-for-cause criteria.

scholarly journals Residual Properties in Damaged Laminated Composites through Nondestructive Testing: A Review

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4513
Author(s):  
Carlo Boursier Niutta ◽  
Andrea Tridello ◽  
Davide S. Paolino ◽  
Giovanni Belingardi
Keyword(s):  
Composite Structures ◽  
Damage Tolerance ◽  
Laminated Composites ◽  
Quantitative Description ◽  
Material Behavior ◽  
Future Research ◽  
Widespread Application ◽  
Residual Properties ◽  
Nondestructive Techniques ◽  
Material State

The development of damage tolerance strategies in the design of composite structures constitutes a major challenge for the widespread application of composite materials. Damage tolerance approaches require a proper combination of material behavior description and nondestructive techniques. In contrast to metals, strength degradation approaches, i.e., the residual strength in presence of cracks, are not straightforwardly enforceable in composites. The nonhomogeneous nature of such materials gives rise to several failure mechanisms and, therefore, the definition of an ultimate load carrying capacity is ambiguous. Nondestructive techniques are thus increasingly required, where the damage severity is quantified not only in terms of damage extension, but also in terms of material response of the damaged region. Based on different approaches, many nondestructive techniques have been proposed in the literature, which are able to provide a quantitative description of the material state. In the present paper, a review of such nondestructive techniques for laminated composites is presented. The main objective is to analyze the damage indexes related to each method and to point out their significance with respect to the residual mechanical performances, as a result of the working principle of each retained technique. A possible guide for future research on this subject is thus outlined.

Electromagnetic damage tolerance for radar absorbing composite structures with impact damage

2020 ◽  
Vol 199 ◽  
pp. 108366
Author(s):  
Jeong-In Go ◽  
Won-Jun Lee ◽  
Sang-Yong Kim ◽  
Sang-Min Baek ◽  
Won-Ho Choi
Keyword(s):  
Composite Structures ◽  
Damage Tolerance ◽  
Impact Damage

Real world application of angular scan pulse-echo ultrasonic propagation imager for damage tolerance evaluation of full-scale composite fuselage

2019 ◽  
Vol 18 (5-6) ◽  
pp. 1943-1952 ◽  
Author(s):  
WJ Lee ◽  
BH Seo ◽  
SC Hong ◽  
MS Won ◽  
JR Lee
Keyword(s):  
Composite Structures ◽  
Fatigue Testing ◽  
Damage Tolerance ◽  
Structural Characteristics ◽  
Full Scale ◽  
Inspection Method ◽  
Complex Test ◽  
Ultrasonic Propagation ◽  
Pulse Echo

Composite structures are assertively used for new airframe designs and manufacturing in military aircrafts because of superior strength-to-weight ratios and fatigue resistance. Because the composites have different fatigue failure characteristics compared with metals, it is necessary to develop different approaches for the composite fatigue design and testing. In this study, we propose an in situ damage evaluation technology with high spatial resolution during full-scale fatigue testing of composite aircraft structures. For real composite structure development considering composite fatigue characteristics, full-scale fatigue and damage tolerance tests of the composite fuselage structure were conducted to evaluate the structural characteristics. In the meantime, the laser ultrasonic nondestructive inspection method, called an angular scan pulse-echo ultrasonic propagation imager, which is fully noncontact, real-time, and portable to position it in between the complex test rigs, is used to observe in situ damage growth of the composite. Finally, the verification procedure assisted by the angular scan pulse-echo ultrasonic propagation imager assures no growth of the initial impact damages after lifetime operation and proves the damage tolerance capability of the developed composite fuselage structure.

Investigation of impact and damage tolerance in advanced aerospace composite structures

2003 ◽  
Vol 8 (3) ◽  
pp. 297-306 ◽  
Author(s):  
J Bayandor ◽  
R S Thomson ◽  
M L Scott ◽  
M Q Nguyen ◽  
D J Elder
Keyword(s):  
Composite Structures ◽  
Damage Tolerance
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