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EAS 4200C Main page for Daniel Arena Class notes / Homework

Material Properties
Aircraft design is governed mainly by the limitations imposed by weight. Mass is the primary concern with respect to all areas including fuselage, wings, engines and everything else. Current design is a balance between performance and how much it will cost to lift off the ground.

One method of combating weight is to use as much light weight yet strong material as possible. Cutting edge composite development is a major part aerospace industry, composites can be used instead of metals and provide the same strength.

There are two main factors to consider with respect to aircraft structure and design, the strength and stiffness of the materials used. Material strength can be described and separated into deformations states. First there is elastic deformation then plastic deformation and permanent deformation. If the material is stressed beyond its maximum yield point it will reach rupture stress and fail.

The Modulus of elasticity also known as young’s modulus is the rate of change between strain and stress. Further informations can be found at

http://www.instron.us/wa/resourcecenter/glossaryterm.aspx?ID=99&ref=http://www.google.com/search.