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Author: Defence Science and Technology Organisation Publisher: ISBN: Category : Airplanes Languages : en Pages : 18
Book Description
The long-term environmental durability of AS4/3501-6 graphite/epoxy composite was evaluated by a ground exposure trial conducted at four locations within Australia and one in Malaysia for a period of between 468 and 520 weeks. The combined effects of moisture uptake, UV degradation, temperature, rainfall and wind on the strength of the samples were all evaluated. The coupons absorbed an average of about 0.9% moisture by weight over the length of the trial. The residual strength of the coupons was determined using the interlaminar shear strength (ILSS) test (ASTM D2344) both at ambient temperature and 100 deg C.A statistical analysis of the results determined that the combined effect of moisture and elevated temperature (100 deg C) decreases ILSS by about 10%. A small enhancement in ILSS at room temperature was noted for specimens which absorbed moisture over the period of the trial. This is likely to be due to the combined effects of stress relief and plasticisation of the matrix. No other significant degradation mechanism was identified in this study apart from a slight decrease in ILSS of about 5% for specimens which were coated with the standard F/A-18 paint scheme. This may be attributed to the solvents used in the application of the paint However, the benefits of the paint protecting the composite surface from erosion and UV degradation far outweigh this structurally insignificant change in ILSS.
Author: Defence Science and Technology Organisation Publisher: ISBN: Category : Airplanes Languages : en Pages : 18
Book Description
The long-term environmental durability of AS4/3501-6 graphite/epoxy composite was evaluated by a ground exposure trial conducted at four locations within Australia and one in Malaysia for a period of between 468 and 520 weeks. The combined effects of moisture uptake, UV degradation, temperature, rainfall and wind on the strength of the samples were all evaluated. The coupons absorbed an average of about 0.9% moisture by weight over the length of the trial. The residual strength of the coupons was determined using the interlaminar shear strength (ILSS) test (ASTM D2344) both at ambient temperature and 100 deg C.A statistical analysis of the results determined that the combined effect of moisture and elevated temperature (100 deg C) decreases ILSS by about 10%. A small enhancement in ILSS at room temperature was noted for specimens which absorbed moisture over the period of the trial. This is likely to be due to the combined effects of stress relief and plasticisation of the matrix. No other significant degradation mechanism was identified in this study apart from a slight decrease in ILSS of about 5% for specimens which were coated with the standard F/A-18 paint scheme. This may be attributed to the solvents used in the application of the paint However, the benefits of the paint protecting the composite surface from erosion and UV degradation far outweigh this structurally insignificant change in ILSS.
Author: Roger Vodicka Publisher: ISBN: Category : Accelerated life testing Languages : en Pages : 50
Book Description
Composite materials are found to lose mechanical [properties?] on exposure to aircraft operating environments. This is mainly due to absorption of moisture from humid air by the matrix material. Composite materials are extensively used by the RAAF for both major structural components on thbe F/A-18 and for bonded repairs and doublers. The performance of these materials under long-term environmental exposure is an important aspect of both aircraft certification and in the understanding of how the components will age. This report provides a broad overview of environmental effects on composite materials and methods which may be used to predict their long-term behaviour. The use of accelerated testing environments in the laboratory is an attractive proposition as it enables tests to be carried out in reduced time frames. A number of accelerated testing methodologies and their implications are outlined here. Accelerated testing can be carried out with confidence if the exposure conditions are representative and the failure modes of the materials during mechanical tests reflect those seen in service.
Author: Vistasp M. Karbhari Publisher: Elsevier ISBN: 1845693566 Category : Technology & Engineering Languages : en Pages : 381
Book Description
Given the increasing use of fibre-reinforced polymer (FRP) composites in structural civil engineering, there is a vital need for critical information related to the overall durability and performance of these new materials under harsh and changing conditions. Durability of composites for civil and structural applications provides a thorough overview of key aspects of the durability of FRP composites for designers and practising engineers. Part one discusses general aspects of composite durability. Chapters examine mechanisms of degradation such as moisture, aqueous solutions, UV radiation, temperature, fatigue and wear. Part two then discusses ways of using FRP composites, including strengthening and rehabilitating existing structures with FRP composites, and monitoring techniques such as structural health monitoring. Durability of composites for civil and structural applications provides practising engineers, decision makers and students with a useful and fundamental guide to the use of FRP composites within civil and structural engineering. Provides a thorough overview of key aspects of the durability of composites Examines mechanisms of degradation such as aqueous solutions, moisture, fatigue and wear Discusses ways of using FRP composites, including strengthening and rehabilitating existing structures
Author: Anastasios P. Vassilopoulos Publisher: Elsevier ISBN: 0857098128 Category : Technology & Engineering Languages : en Pages : 553
Book Description
It is commonly accepted that the majority of engineering failures happen due to fatigue or fracture phenomena. Adhesive bonding is a prevailing joining technique, widely used for critical connections in composite structures. However, the lack of knowledge regarding fatigue and fracture behaviour, and the shortage of tools for credible fatigue design, hinders the potential benefits of adhesively bonded joints. The demand for reliable and safe structures necessitates deep knowledge in this area in order to avoid catastrophic structural failures. This book reviews recent research in the field of fatigue and fracture of adhesively-bonded composite joints. The first part of the book discusses the experimental investigation of the reliability of adhesively-bonded composite joints, current research on understanding damage mechanisms, fatigue and fracture, durability and ageing as well as implications for design. The second part of the book covers the modelling of bond performance and failure mechanisms in different loading conditions. A detailed reference work for researchers in aerospace and engineering Expert coverage of different adhesively bonded composite joint structures An overview of joint failure
Author: Defence Science and Technology Organisation
Author: Defence Science and Technology Organisation
Author: Howard Benson Dexter
Author: Richard Alan Pride
Author: Richard A. Pride
Author: Roger Vodicka
Author: Daniel J. Hoffman
Author: Christian JL.
Author: Vistasp M. Karbhari
Author: Anastasios P. Vassilopoulos
Author: