Abstract
The high level of durability and reliability is a strict requirement for today's aircraft constructions. The most important aspect is the mass of the structure which has a decisive influence on both the volatile and technical properties of an aircraft as well as its economical operation. Modern aircraft structures, or more precisely their load-bearing structures, are almost exclusively manufactured as thin-walled ones which meet the requirement to minimize the mass of the structure. While the local loss of coverage stability is permissible under operating load conditions, exceeding critical load levels of the structural skeleton elements (e.g. frames, stringers) is practically synonymous with some destruction of the structure. It results in a necessity for the continual improvement of both design methods and the improvement of structural solutions of aviation structures. By reducing the thickness of the cover and, at the same time, introducing densely spaced stiffening longitudinal elements, a structure with considerably higher critical loads can be obtained and, consequently, a more favorable distribution of gradients and stress levels which directly contributes to an increase in fatigue life. This paper attempts to analyze the above-mentioned problem more closely, using the example of a densely ribbed rectangular plate.
Highlights
Aviation structures are subject to a wide spectrum of loads during operation
Each task performed during a flight consists of a number of maneuvers that generate different types of aircraft load, both in value and direction of their action
The most important element is the mass of the structure, which has a decisive impact on both flight and technical properties, as well as economic efficiency
Summary
Aviation structures are subject to a wide spectrum of loads during operation. Each task performed during a flight consists of a number of maneuvers that generate different types of aircraft load, both in value and direction of their action. The most important element is the mass of the structure, which has a decisive impact on both flight and technical properties, as well as economic efficiency All of these factors make aircraft one of the most complex systems of modern technology. More precisely, load-bearing structures, are made almost exclusively as thin-walled ones to fulfil perfectly the postulate of minimizing the structure’s mass Such structures, in which the cover is reinforced with longitudinal and transverse elements, providing the whole system with the required rigidity and strength, are common. Local loss of coverage stability is permissible only under the conditions of a service load, exceeding the critical load levels of the skeleton body components (frames, longerons) is virtually synonymous with structural damage This specificity forces a continual improvement of both design methods and solutions for aviation structures. By simultaneously reducing the thickness of the covering and introducing densely arranged stiffening longitudinal elements, a structure with significantly higher critical load values can be achieved, and this results in a more favorable distribution of gradients and stress levels, which leads, in turn, to an increase of the structure’s fatigue life
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