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Air Frame - Sheet Metal Repair
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Terms in this set (27)
Bearing Strength
•A sheet of metal being able to withstand of being torn away from the rivets in a joint.
•Affected by both its thickness and by the size of the rivet in the sheet.
Shear Loads
Created when opposing forces are applied on opposite sides of a body.
Shear Versus Bearing
The bearing strength and shear strength should be as near the same as possible, with the shear strength being slightly less.
Proper Rivet Diameter
3x the thickness of the Thickest Sheet of Metal in the joint.
Width of the BuckedHead
Must be equal to 1 1/2x the Rivet's Original Shank Diameter
Height of the Rivet
Must be 1/2 the Rivet's Original Shank Diameter
Calculation of Rivet Length
•Multiplying the Diameter of the Rivet by 1 1/2
0.125 x 1.5 = 0.1875
•Add the Grip Length of the Metal to obtain an Overall Length
0.1875 + (.032 + .040) = 0.2577 inches
•Convert the answer into the closest 1/16 inch Increment
Rivet Pitch
• Distance between Adjacent Rivets in a Row
• Minimum : 3D
• Maximum : 10D-12D
Rivet Gauge or Transverse Pitch ( Distance between Rows of Rivets in a Multi Row Layout))
75% of the Pitch (Provided that the rows are Staggered)
Two times the diameter of the rivet shank.
What is the minimum edge distance for aircraft rivets?
Shear Loads.
A well-designed rivet joint will subject the rivets to:
1 1/2 the Diameter of the Rivet Shank
The shop head of a rivet should be:
56
How many MS20470 AD-4-6 rivets will be required to attach a 10" x 5" plate, using a single row of rivets, minimum edge distance, and 4D spacing?
Shear
What type loads cause the most rivet failure?
One and one-half times the rivet diameter plus .096 inch.
The length of a rivet to be used to join a sheet of .032-inch and .064-inch aluminum alloy should be equal to :
What is generally the best procedure to use when removing a solid shank rivet?
Drill through the manufactured head and shank with a drill one size smaller than the rivet and remove the rivet with a punch.
Shear Failure
Joggles in removed rivet shanks would indicate partial:
5/16 inch
The length of rivet to be chosen when making a structural repair that involves the joining of 0.032-inch and 0.064-inch aluminum sheet, drilled with a No. 30 drill, is:
Diameter of the rivets being used.
A factor which determines the minimum space between rivets is the :
Straighten cold and Reinforce.
When straightening members made of 2024-T4, you should:
All scratches, kinks, tool marks, nicks, etc., must be held to a minimum
When fabricating parts from Alclad 2024-T3 aluminum sheet stock,
Permitted but are normally more critical in reference to strength in tension than similar repairs to the upper surface
Repairs or splices involving stringers on the lower surface of stressed skin metal wings are usually :
Shear Strength of the riveted joint.
When repairing a small hole on a metal stressed skin, the Major Consideration in the Design of the patch should be :
Thickness of the material is Greater than the Thickness of the Rivet Head
What is one of the determining factors which permits machine countersinking when flush riveting?
Three times the Diameter of the rivet shank
What is the minimum spacing for a single row of aircraft rivets?
Centers of Adjacent Rivets in the Same Row.
Rivet pitch is the distance between the
Burnishing.
Shallow scratches in sheet metal may be repaired by:
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