Advances in the Bonded Composite Repair o f Metallic Aircraft Structure phần 8 ppsx
Advances in the Bonded Composite Repair o f Metallic Aircraft Structure phần 8 ppsx
... 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, gr/ep versus ... used to predict the effect of increasing the size of the initial bondline defect. Table 15.4 shows that, for a crack length of 15mm, AKP/AKu increased from 0.24 in the absence of bondline ... increase. The failure mode is then expected to change from patch failure to disbonding from at the ends of the patch. under the patch. disbonding occurs. 434 Advances in the bonded composite...
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Advances in the Bonded Composite Repair o f Metallic Aircraft Structure phần 1 potx
... 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 viability of this fleet. The ... FOREWORD The introduction of the technology for bonded composite repairs of metallic airframe structures could not have come at a more opportune time. Today, many countries are facing the...
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Advances in the Bonded Composite Repair o f Metallic Aircraft Structure phần 2 potx
... 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 ... 26 Advances in the bonded composite repair of metallic aircraft structure composites are very abrasive and diamond tipped tools are normally used for cutting or machining. The fine graphite ... 48 Advances in the bonded composite repair of metallic aircraft structure current understanding and the complexity of the bonded joint, there is no reliable way to accelerate nature to obtain...
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Advances in the Bonded Composite Repair o f Metallic Aircraft Structure phần 3 pptx
... 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 plies of the composite. Obviously the failure ... For a thermal loading of AT = -60 "C, which corresponds to cooling the cured specimens from the curing temperature of 80 "C down to the testing temperature of 20 "C, the...
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Advances in the Bonded Composite Repair o f Metallic Aircraft Structure phần 4 docx
... 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 ... with the first-order approximation given by Eq. (7.14). It can be seen that the first-order solution ignoring the load attraction effect of composite 1 78 Advances in the bonded composite repair ... 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 so close to it that the differences...
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Advances in the Bonded Composite Repair o f Metallic Aircraft Structure phần 5 pdf
... then decay linearly to zero at the free surface of the skin (or plane of symmetry in the case of a patch on both sides of the skin). This results in the matrix D having the form: D =fO ... 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 the wing pivot fitting of FlllC aircraft ... program, reported in reference [I6], have confirmed this need. Indeed, the tendency for the centroid of the skin/patch combination to align itself with the plane of action of the remote load...
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Advances in the Bonded Composite Repair o f Metallic Aircraft Structure phần 6 pptx
... mm from the centre of the lower lug and continued to the end of the “horizontal” section around the lug, as indicated in Figure 10.24. The first ply of the boron/epoxy reinforcement was then ... in the bonded composite repair of metallic aircraft structure ioo.0 Fig. 10.22. Typical auxiliary model used in the shape optimisation procedure for F/ A- 18 aileron hinge, showing point ... tt-' is the height for step k. 280 Advances in the bonded composite repair of metallic aircraft structure Table 10.1 Geometric details for patch on one side of plate for non- uniform...
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Advances in the Bonded Composite Repair o f Metallic Aircraft Structure phần 7 pdf
... of a1. The coefficients of thermal expansion, a1 and a2, are the effective coefficients of thermal expansion for a unidirectional laminate. For a 3D laminate the out of plane coefficient ... stresses. In a bonded joint in which two materials are bonded together, thermal stresses may develop as a result of the difference in thermal coefficients of expansion. The following equations ... repairs of aircraft wings The object of this section is to determine the applicability of a closed form solution to the large repair of an aircraft wing, whose cross section is shown in Figure...
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Advances in the Bonded Composite Repair o f Metallic Aircraft Structure phần 9 pptx
... 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, and corrosion of the mating skins could ... configuration of the defects. In some cases the defects only remained on one side of the hole, the other being removed by the tool. Following this the fasteners were inserted. The specimens...
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Advances in the Bonded Composite Repair o f Metallic Aircraft Structure phần 10 docx
... assessment of bonded composite doubler repairs 491 Application of impact damage to composite coupons Following the composite doubler installation and prior to environmental conditioning, ... performed in- situ to eliminate the removal of the specimens from the tension test machine following each fatigue interval. 5. Static strain measurements were acquired at the following four fatigue ... a point of reference, a shape outline of the Boron-Epoxy doubler is superimposed on the C-scan image. Side-by-side comparisons of the before and after C-scans show that the original engineered...
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