Лако-красочные материалы — производство

During the early 1940s, the first aluminum components were bonded by means of a hot-setting phenolic resin plastified with polyvinyl formal, called ‘Redux’ (see Chapter 2 and Section 5.4). High-strength and fatigue-resisting joints were obtained when aluminum alloys were pickled with an aqueous solution of sulfuric acid and sodium dichromate at 60 ° C for […]

Aircraft manufacture is the number one field of application for high-performance bonding technology. However, with few exceptions, there has been a certain regression — or at least stagnation — in the application and further development of structural bonding. Problems which occurred during the 1970s contributed especially towards this trend. In metal aircraft manufacture, approximately 10-15% […]

Perhaps the most diversified branch of adhesive use is in transportation, be it by water, by land, or by air. Private or public mobility, hobby activity or leisure time are relevant parameters for the classification of transportation systems according to their purpose. In all fields oftransportation, the higher the weight ofa transportation system, the greater […]

8.1 Introduction Examples for the successful use of adhesive bonding technologies can be found in many fields of application. When choosing the best adhesive for a specific applica­tion, the limits of resistance of an adhesive joint to static, cyclic or impact load must be considered. The expectation in service life depends on the service conditions […]

One of the problems of adhesive bonding technology is the fact that bonded joints may fail unpredictably when the adherents are contaminated. Even pre-existing contaminations in the form of monolayer adsorbates on the adherent surface prevent a load-carrying intermolecular interaction between the adhesive and the load-bearing adherent. Contaminations induce adhesive failure and poor aging behavior […]

Filter elements for hydraulic flight regulation systems (Figures 7.73 and 7.74) usually consist of a metal casing with a glued-in filter. The adhesive bond must be resistant to temperatures in excess of 150 °C. Failure of the bond and loosening of the filter from its seating allows the fluid and included debris to bypass the […]

As illustrated in Figure 7.71, damage occurred in a honeycomb structure of a service hatch of an aircraft; here, a delaminated glass-fiber patch impaired the function of an engine control unit. The distance between the hatch and a heat exchanger nearby was less than 2 mm in some places, while in some areas they even […]

Inaccurate temperature control during the autoclaving process may indeed be the cause for adhesive failure. This is demonstrated by the delamination of a tail rotor blade (Figure 7.69). During inspection, a delaminated area was found in the bonding between honeycomb and outer cover sheet which was opened during a failure analysis in the laboratory. The […]

Large-area delamination ofthe adhesive bonding between the aluminum outer cover sheet and honeycomb structures of the tail unit of aircraft resulted in several cases with a similar damage pattern (Figure 7.67). Due to these delaminations the outer cover sheets were even lost during flight, with both the bottom side and upper side of the cover […]

The following case illustrates the influence of a maritime climate and the classic pattern of bond-line corrosion (see Section 7.7.6). The aircraft concerned had been used for low-altitude maritime surveillance for about 40 years, and were therefore exposed to severe aerodynamic and corrosive conditions. Both, the cabin and the wings are mostly made of bonded […]