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. Th...

Ngày tải lên: 08/08/2014, 11:21

... a repair to the lower wing skin of a Mirage I11 aircraft. At this stage it should be noted that whilst much of the initial impetus for composite repairs arose from the need to maintain the ... 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...

Ngày tải lên: 08/08/2014, 11:21

... K .F. Walker and L.R .F. Rose 27. 4. Validation strategy 27. 5. 27. 6. 27. 7. 76 7 76 8 76 8 76 9 76 9 76 9 77 1 77 2 77 3 77 4 77 6 77 6 77 7 77 7 77 7 77 8 77 9 77 9 78 3 78 3 78 3 78 4 78 4 ... 1 76 2 76 2 76 3 76 4 76 5 76 6 76 6 76 7 FOREWORD The introduction of the technology for bonded composite repairs of metallic airframe struc...

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 ... Advances in the bonded composite repair of metallic aircraft structure provides little inherent corrosion protection. Although the use of a few rub...

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 pli...

Ngày tải lên: 08/08/2014, 11:21

... plane of the composite plate consisting of the base plate and rigidly -bonded reinforcement is denoted by F, referring to Figure 7. 13, (7. 49) The moment of inertia of the reinforced region ... methods for designing composite repairs 1 57 7. 6. One-sided repairs So far we have ignored the tendency for out-of-plane bending that would result from bonding a reinfor...

Ngày tải lên: 08/08/2014, 11:21

... 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 ... 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 st...

Ngày tải lên: 08/08/2014, 11:21

... strains in the bond line of the boron/epoxy patch remain above the design limit for typical operating loads. Figure 14.9 shows the influence of the operating temperature on the most significant ... DERA research on bonded composite patch repair of aluminium alloy structures; it contains nine main sections covering repair of thin skin components, repair of th...

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, ... the bonded composite repair of metallic aircraft structure 21. Roach, D.P. (2001). Commercial application of composite doublers for DC-IO fuselage repairs, Int’l. SA...

Ngày tải lên: 08/08/2014, 11:21