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4. ASTM International, also known as American Society for Testing and Materials, located in West Conshohocken, PA. ASTM's aerospace material standards are instrumental in evaluating materials, components, and devices primarily used in aerospace and aircraft industries. The aerospace material standards also discuss the design and safety operation of various engines to be used in unmanned aircraft systems and airplanes. In order to design an aerospace component, please refer to the chp 8_Phase, justify the following metals and their feasibility to serve as aerospace materials: Al, Mg, Ni. (Hint: please check their density, boiling temp, in order to verify the phase change upon aerospace environment)

Answer 1

For thiis post we want to focus on two important aspects of identifying specific extruded aircraft parts using the AND (Army Navy Drawing) part shapes designations and the desired AMS (Aerospace Materials Specification) for a particular part, or shape.

AMS stands for Aerospace Material Specifications that are established by the Society of Automotive Engineers or SAE. AMS specifications are compiled in a comprehensive database of individual directives that standardize procedures, equipment and processes related to aerospace material processing. These are continuously updated and revised to stay up-to-date with advances in material science and processes technologies.

There are a several standard aerospace and aircraft extruded aluminum shapes with AND (Army Navy Drawing) shape designations. Each designation describes a specific part shape such “10133”, for example, which refers to an equal leg angle. (Illustration 1a)

у AND10133 SET R y x х A у

[1a]

AND10133 is an aluminum extrusion available in many different alloys and finishes such as 7075, 2024 and 6061 in both tempered condition and 0 condition. AND10133 extrusion is used in maintenance applications and new build applications throughout the aviation and aerospace industry.

While there are a number of other shapes available, the most common are listed below. (Illustration 1b)

LTU 2 HT AND 10135 Angle, Bulb, Extruded AND 10136 Tee Extruded AND 10137 Channel Extruded AND 10138 & 10139 Zee, Equal Leg. Extruded AND 10140 "H" Beam Extruded AND 10141 Tee, Bulb Extruded

[1b]

An AMS specification covers the general requirements for aluminum alloy bar, rod, shapes, structural shapes, tube and wire, extruded. Specific requirements for these products in a particular alloy are covered by the applicable detailed specification.

For example, the part AND10133-0401 is made with the aluminum alloy 7075 and has a T6511 temper. This temper is achieved as the aluminum is solution heat-treated, stress relieved, then artificially aged. Stretching the metal by an amount that depends on the type of standard wrought product being made, either extrusion or tube, results in stress relief. The metal is straightened after the stretching operation.

This particular part has a specification of AMS QQ-A-200/11. This specification, according the SAE, covers the specific requirements for aluminum alloy 7075 bar, rod, shapes, tube, and wire produced by extrusion. It also has the second highest strength compared to the other variations of 7075 aluminum.

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