Advances in the Bonded Composite Repair o f Metallic Aircraft Structure phần 5 pdf

... consider the effect that the difference between the coefficients of thermal expansion of the boron patch and the aluminium alloy wing skin has on the residual stresses left in the skin after the patch ... to design several complex repair schemes, such as the repair of fatigue cracks in the lower skin of Mirage aircraft [2], and cracks on the upper surface of...

Ngày tải lên: 08/08/2014, 11:21

... the first being the isotropic solution and the second the orthotropic solution. Application of a closed form solution to the repair of an aircraft wing requires an assumption of the value of ... debonding (referring to Chapter 13 for more details). In the following, we will focus our attention on the influence of thermal residual stress only. For an orthotropic com...

Ngày tải lên: 08/08/2014, 11:21

... determine the economic life of the airframe. Unfortunately, management of corrosion by the setting of inspection intervals is not always effective since the location of corrosion and its rate of ... use of this technology. The application for the solution of the problem of cracking in the fuel drain holes in wing of the C-141 is credited with maintaining the viab...

Ngày tải lên: 08/08/2014, 11:21

... Keeping void contents low is a matter of recognising the origins of the voids and ensuring that appropriate procedures are used. If the 64 Advances in the bonded composite repair of metallic aircraft ... ratio of the support span to specimen thickness. For the 55 21/4 B/Ep composite, an ILS value of 97 MPa or above, indicates the material is in good condi...

Ngày tải lên: 08/08/2014, 11:21

... Advances in the bonded composite repair of metallic aircraft structure 4 .5. 4. Fickean diffusion coeflcients for moisture absorption Althof [24] gives the following data for the diffusion coefficients ... The adhesive to metal or composite interface 0 The adhesive to primer interface 0 The surface matrix resin of the composite 0 The near-surface p...

Ngày tải lên: 08/08/2014, 11:21

... practice, however, structures to be reinforced may be finite in size or constrained by the surrounding structure. To quantify the effect of this constraint, consider the configuration shown in Figure ... even though the load transfer through the bonded joint around the periphery of the patch is not instantaneous in the manner of the inclusion model, it is s...

Ngày tải lên: 08/08/2014, 11:21

... function by transferring some portion of the load from the reinforced component through the adhesive bond layer, thereby reducing the range and mean of the cyclic stresses in the repaired component. ... results from finite element (FE) analyses are given to highlight the influence on the plate stress concentration for a bonded repair specimen of the following:...

Ngày tải lên: 08/08/2014, 11:21

... comprising cooling from +50 "C to -55 "C over 70min, dwell at -55 °C for 30min, heating to +50 "C over 35min, and dwell at 50 °C/96%RH for 58 5min. Exposure to this cycle for ... DERA research on bonded composite patch repair of aluminium alloy structures; it contains nine main sections covering repair of thin skin components, repair of thick sections...

Ngày tải lên: 08/08/2014, 11:21

... Advances in the bonded composite repair of metallic uircraft structure Following the development of a bonded- composite repair for MSD in the fuselage lap-joint of wide bodied transport aircraft ... is done for the purpose of increasing the fatigue life of the joint. In service, environmental degradation may cause this bond to become ineffective,...

Ngày tải lên: 08/08/2014, 11:21

... assessment of bonded composite doubler repairs 491 Application of impact damage to composite coupons Following the composite doubler installation and prior to environmental conditioning, ... Advances in the bonded composite repair of metallic aircraft structure 2. The load was increased, using displacement mode control, at a continuous rate of O. OSin...

Ngày tải lên: 08/08/2014, 11:21