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Composite material failure in aircraft

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  1. Typical aircraft fibre composites
  2. Fiber composite use in aircraft
  3. Composite behaviour under load
  4. Behaviour of composites in high-load and impact situations
  5. Repairability of composite structures
  6. Post-crash safety and handling of composite materials

Some composite materials used in construction of aircraft structures started appearing in late 1930s as well as 1940s. Typically, they used to be plasticity impregnated wood materials at that time, with the well know as well as the largest example being Duramold constructing the eight engine Hughes Flying Boat. The Duramold materials as well as construction methods also got to be used for a few aircraft productions. Interest in the use of fibreglass material developed in the 1940's, in the manufacture for fabrics made of glass fibres. By the time 1960s, there were enough techniques as well as materials already developed for making more extensive use of fibres material possible. Composite is a term that is used for this construction method to means integration of different materials to come up with a single material of lightweight, stronger as well as provide other benefits that could not be achievable with each of the materials being used separately. Fibre composites comprise of fibre reinforced resin matrix. Resin could be epoxy, vinyl polyester or even polyester. On the other hand, the strengthened could be any of the different fibres available such as boron, glass among others.

[...] As seen before, in composites, tensile failures form rough fractures surfaces. Observation showed roughness on the right composite lug. The rough appearance on the surface assisted the NTSB to make the determination that, the failure of the lag took place under tensile loads. On the two remaining lugs on the stabilizer's right side, a similar roughness was evident, through which the NTSB made the conclusion that the lugs within that side failed as a result of overstress due to tensile loading. [...]

[...] As number of cycles increase then accumulates. Do not forget that development of cracks could even occur while maximum cycle stress happens to way below static cracking threshold for cycles; however, these only happen after numerous cycles. Early matrix cracking initiation within fatigue in relation to static loading is results to decrease in threshold for onset of other damage types. Delaminations could spread over many thousands of cycles leading to separating laminate into discrete laminae that go on supporting tensile loads through the plies (Hollaway, 2001) Delamination Composite materials are made inform of laminates ( ASAL ILMU, 2015). [...]

[...] Hollaway, L. C Advanced Polymer Composites and Polymers in the Civil Infrastructure ed. Kidlington: Elsevier. Johnson, T Boeing's 787 Dreamliner. [Online] Available at: Dreamliner.htm [Accessed 2015]. Justin, H Boeing 787: From Bottom Up. Boeing, p Laurie, W Tougher carbon fibre using CNTs. [Online] Available at: fibre-using-cnts/ [Accessed 2015]. Luis, P. C., Javier, S. [...]

[...] Fatigue pp. 563-578. David, L. B An Introduction to Advanced Composite Structures Repair. Aviationpros, p David, P. B Awesome Carbon Fiber Seats on Qantas' Airbus A380?s. [Online] Available at: seats-on-qantas-airbus-a380s/ [Accessed 2015]. Dennis, R Assessing conventional and advanced NDI for composite aircraft. [Online] Available at: conventional-and-advanced-ndi-for-composite-aircraft [Accessed 2015]. Faye, S The Use Of Composites in Aerospace: Pas Present and Future Changes. [...]

[...] Of most concern are polymer matrix composites due to their dominant use as well as lower temperature constraints. There is still the need for more research on vapour release for resin, more specifically the newer systems of resin, as well as its long and short-term effects. Fume and Smoke Hazards in general- Fume and smoke from burning composite materials need to be regarded as toxic in general. Combined with multitudes of other gasses, smoke and fumes that burning aircrafts release, they could have some symbiotic effect. [...]

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