Damage tolerance-based design of conformal antenna composite structure

In this paper, the probabilistic compliance methodology for damage tolerance design of thicker composite structures were investigated, and the research results show that for the composite laminates withstanding impact energy below 90J, if it cannot produce barely visible impact damage (BVID), then using the probabilistic methodology can meet certification requirements of damage tolerance.

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Investigation on Damage Tolerance of Carbon/Epoxy Laminate for Aircraft Structural Design

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.488-489.460 ◽

2011 ◽

Vol 488-489 ◽

pp. 460-463

Author(s):

Hyun Bum Park ◽

Chang Duk Kong ◽

Kyung Sun Lee

Keyword(s):

Compressive Strength ◽

Composite Structure ◽

Structural Design ◽

Damage Tolerance ◽

Epoxy Composite ◽

General Aviation ◽

Small Scale ◽

Foreign Object ◽

Foreign Object Damage ◽

Impact Damages

In Korea, the KC-100, which is a small scale piston propeller general aviation aircraft, has been developed to establish a domestic certificate infrastructure and system through the BASA(Bilateral Aviation Safety Agreement) program by KAI(Korea Aerospace Industries, Ltd.). This aircraft adopted the whole composite structure concept for an environmental friendly aircraft through low fuel consumption due to structure weight reduction. However the carbon/epoxy composite structure, which is mainly used for this aircraft, is very weak against foreign object damage. Therefore the purpose of the damage tolerance design philosophy is to ensure that the aircraft can operate safely for a period of time with damage present within the airframe. This study is to investigate the residual compressive strength of the carbon/epoxy UD and fabric laminate due to impact damages. Through investigation on compressive strength, design allowable of carbon/epoxy laminate is determined by the experiment to address design criteria of the composite structure.

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The Different Probabilistic Method for the Conservatism Analysis of Composite Structure Damage Tolerance Design

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.194-196.1672 ◽

2011 ◽

Vol 194-196 ◽

pp. 1672-1675

Author(s):

Tian Chun Zou ◽

Zhen Yu Feng ◽

Hao Lei Mou ◽

Ke Yi Mao

Keyword(s):

Impact Energy ◽

Composite Structure ◽

Calculated Result ◽

Damage Tolerance ◽

Probabilistic Method ◽

Probabilistic Methods ◽

Tolerance Design ◽

Distribution Fitting ◽

Structure Damage ◽

The Impact

The result shows: If probabilistic methods were used to conduct compliance analysis for composite structure damage tolerance. When the impact energy is low, calculated result should conservatively use probabilistic methods of Weibull distribution fitting; when the impact energy is high, calculated result should conservatively use probabilistic methods of logarithmic linear fitting.

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