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Aerospace Fastener Applications

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Presentation on theme: "Aerospace Fastener Applications"— Presentation transcript:

1 Aerospace Fastener Applications
Part 2 An Aerospace Manufacturing Perspective

2 Aerospace Rivets Primarily used to fasten aerospace skins to the sub-structure Concerned mainly with shear and tension loads. Two types of rivets: Solid Rivet Blind Rivet

3 Aerospace Rivets Rivets on the skin of a Boeing 737

4 Aerospace Solid Rivets

5 Aerospace Solid Rivets
Universal solid rivets on the skin of a Boeing 737 Note that they are not flush with the skin

6 Aerospace Solid Rivets
Countersunk solid rivets on the engine pylon of a Boeing 737 Note that these rivets are flush with the surface

7 Aerospace Solid Rivets

8 Aerospace Solid Rivets - Identification
Rivets manufactured in accordance with the AN/MS standards are identified by a four part code: AN or MS specification and head type one or two letters that indicate the material shank diameter in 1/32nd inch increments a dash followed by a number that indicates rivet length in 1/16th inch increments.

9 Aerospace Solid Rivets - Identification
Aircraft rivets are made of many materials, and come in a wide variety of shapes and sizes How do you select the right size? How do you select the right material? We must know what the part number tells us…

10 Aerospace Solid Rivets - Identification
Example: rivet identification standard universal head solid rivet Material: 2117-T4 aluminium 1/8 inch diameter 5/16 inch in length Rivet ID = either AN470AD4-5 or MS20470AD4-5

11 Aerospace Solid Rivets - Identification
Same rivet, different material:1100 aluminium AN470A4-5 or MS20470A4-5. AN470 or MS20470 denote the specification for universal head types AD is the material code for 2117-T4 (A=1100, B=5056, C=copper, D=2017, DD=2024, F=stainless and M=Monel) 4 = 4/32 or 1/8 inch diameter -5 = 5/16 inch length

12 Aerospace Solid Rivet Installation
Rivet installation summary Drill appropriately sized holes Deburr holes Secure pieces together with Clecos Install rivet, buck with rivet gun or use a rivet squeezer

13 Aerospace Solid Rivet Installation
.032” 2024-T6 sheet aluminum to be joined with rivets Rivet gun Bucking bar Drill Drill bit and chuck key Center punch Cleco Cleco pliers

14 Aerospace Solid Rivet Installation
Drilling holes with a #30 drill bit Use 1/8” rivets with a #30 (.1285”) drill bit

15 Aerospace Solid Rivet Installation
Deburr the holes by rotating (by hand) a much larger drill bit in the holes This removes any metal shavings caused by drilling

16 Aerospace Solid Rivet Installation
Position the pieces together and secure using Clecos Clecos maintain proper alignment of the pieces while rivets are being installed

17 Aerospace Solid Rivet Installation
Place the rivet in the hole Make sure you are using the correct size, material, and type of rivet

18 Aerospace Solid Rivet Installation
Align the rivet gun on the rivet head Hold the bucking bar on the opposite end of the rivet Pull the trigger on the rivet gun to hammer the rivet in place

19 Aerospace Solid Rivet Installation
Solid rivets can be installed using a rivet squeezer instead of a pneumatic rivet gun The squeezer is hand operated The squeezer uses various inserts depending on the type and size of rivet being installed

20 Aerospace Blind Rivets
Used when you cannot physically access one side of the work Blind rivets are hollow, and thus weaker than solid rivets To retain strength of the joint: stronger material, larger diameter rivets, or more are necessary and of course 20–50% heavier than a solid rivet because of steel stem

21 Aerospace Blind Rivets

22 Aerospace Rivets – Fuselage Repair
Exterior of a riveted patch fuselage skin patch Note that solid fasteners are used except in the middle of the patch Why would you use blind fasteners in this application?

23 Aerospace Rivets – Fuselage Repair
Interior of a riveted fuselage skin patch Because the stringer on the interior of the fuselage prevents the bucking a solid rivet requires Blind rivets are the only option when access is restricted

24 Quality Assurance of Aerospace Fasteners
Aerospace Fasteners Material Selection Aerospace Fasteners Testing

25 Aerospace Fasteners Material Selection
Background Some factors to be considered before material selection are: The max. and min. operating temperatures The corrosiveness of the environment Fatigue and impact loading Always try to use standard fasteners, such as AN, MS, MIL, NAS, SAE

26 Aerospace Fasteners Material Selection
Alloy Steels Aluminum Titanium Stainless Steel Superalloys

27 Aerospace Fasteners Material Selection
Aluminum is the predominant material used in the manufacture of commercial aircraft. Table 3 lists the typical aluminum alloys used in commercial aircraft.

28 Basic Aerospace Fasteners Application
The basic applications (or needs) for aerospace fasteners are: Shear Tension Fatigue Fuel tightness High temperature Corrosion control

29 Aerospace Fasteners Testing
Analyzing a Joint Calculate all the load required for each type of joint failure: Rivet Shear Sheet Tensile Bearing Sheet Shear Failure will occur in the mode that corresponds with the lowest load carrying capability.

30 Aerospace Fastener Standardization
Most aerospace hardware is manufactured per government standards The three most common aircraft fastener standards used are: AN = Air Force/Navy NAS = National Aerospace Standards MS = Military Standards

31 Common Standardized Fasteners
Bolts Nuts Washers Turnbuckles Cotter pins Screws Rivets Plumbing fittings (pipes and tubes)

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