Metallic Structures

Question 1

What are the four common basic stresses on an aircraft

Answer 1

Tension compression shear bearing

Question 2

What is the grip length of rivet

Answer 2

Combine thickness of the material to be joined by the rivet

Question 3

Where are special rivets, such as huck or cherry lock rivet used?

Answer 3

Where access to both side of the rivet structure is impossible. Limited will not permit the use of bucking bar. Call blind rivet

Question 4

What is the boned honeycomb( sandwich) construction

Answer 4

Laminar construction consisting of combination of alternating dissimilar material, assembled and fixed in relation to each other so that the properties of each can be used to attain specific structural advantages for the whole assembly while reducing weight ( a laminar construction with honeycomb in the middle )

Question 5

What type of material are used in honeycomb construction

Answer 5

Stainless steel , titanium, magnesium, plywood, resin, impregnated, paper e-glass nylon in various combination

Question 6

Where are sandwich construction assembly used?

Answer 6

Bulkhead, control surfaces, fuselage panels,wing panels, Radoms, empennage skins or shear webs

Question 7

What calculations must be made when bending sheet metal

Answer 7

Setback and bend allowance

Question 8

What factor are used to determine setback

Answer 8

Radius of the bend and the thickness of the material Setback = radius+ thickness

Question 9

When bending a sheet metal, how should the grain be in relation to the bend

Answer 9

Bend should be Perpendicular to the grain

Question 10

What is the bend tangent line

Answer 10

Line at which the metal starts to bend

Question 11

What is a jiggle

Answer 11

Offset near the edge of a piece of sheet metal to allow of clearance for a sheet or extrusion

Question 12

what are several methods using forming sheet metal

Answer 12

Folding , bumping, crimping , shrinking and stretching

Question 13

What kind of metal formed it is done by bumping

Answer 13

Compound curve

Question 14

Briefly describe the anodizing process, and what purpose is serve

Answer 14

Aluminum alloys are placing electrolytic bath which caused a thin film of hydroxide on the surface of aluminum. this anodizing coating not only provides excellent resistant to corrosion, but it is also excellent bond for paint

Question 15

What are the proper dimensions for the shop head of a rivet

Answer 15

1.5 times the diameter in width .5 times the diameter and height after bucking

Question 16

What size drill should be used for common shank with a diameter of 3/32 , 4/32 ,5/32 inch

Answer 16

3/32 = 40 ,4/32=30 , 5/32 =21

Question 17

What is a lightening hole?

Answer 17

 Holes are cut into rib, sections, fuselage frame, and other structural parts to decrease weight. Flange are presss around the hole for strength