Introduction to Aerospace Engineering
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1 Introduction to Aerospace Engineering Lecture slides Challenge the future 1
2 Structures Aircraft & spacecraft shell structures Faculty of Aerospace Engineering Delft University of Technology Challenge the future
3 Introduction Outline of lectures/lecturer 15/11 Material physics & properties / environment 22/11 Structures 29/11 Loads 6/12 Materials & manufacturing 13/12 Selection of materials & structures / space 20/12 Design & certification / fatigue & durability 6/1 Manufacturing & joining Lecturer Name: R.C. Alderliesten (Structural Integrity) Room: NB R.C.Alderliesten@tudelft.nl Structures 2 25
4 Learning objectives Student should be able to Give definition of Airframe Principal structural elements Secondary structural elements List typical structural elements for aircraft and spacecraft Explain the function of sheets Explain the difference between material stiffness and structural (geometrical) stiffness Structures 3 25
5 Aircraft & spacecraft structures Definition of airframe Aircraft/spacecraft without installed equipment and furnishing Consists of load bearing parts: parts that take up forces during normal flight maneuvers take-off Landing, etc. Consists of skin and framework (skeleton) that provide aerodynamic shape Protects contents from environment Structures 4 25
6 Aircraft structures Examples Skin and framework Structures 5 25
7 Spacecraft structures Examples Skin and framework Structures 6 25
8 Aircraft & spacecraft structures Definition of primary/secondary structure Primary structure Critical load bearing structure of an aircraft/spacecraft that in case of severe damage will fail the entire aircraft/spacecraft Secondary structure Structural elements of an aircraft/spacecraft that carry only air and inertial loads generated on or in the secondary structure Structures 7 25
9 Aircraft & spacecraft structures Typical elements Fuselage shells Skin Frames Stringers Bulkheads Splices Wing structure Wing skin panels Ribs Spars Assembly of spars & skin Structures 8 25
10 Shell structures Recall: from truss to shell structures Function of diagonal elements (tension & compression) Replacement by sheet (compression causes buckling) Structures 9 25
11 Shell structures Examples of buckling Buckling of sheet Structures 10 25
12 Shell structures Sheet material A sheet has more capabilities than reinforcing a structure! Tension Compression Diagonal function: shear Sealing function (air tight, fuel tight) Structures 11 25
13 Shell structures Stiffness of sheet material A sheet in compression bends out Sheet in tension is not a problem Structural solutions Fold the sheet stiffening effect Support sheet with stiffener Structures 12 25
14 Shell structures Example of folding/corrugating sheet Junker Structures 13 25
15 Shell structures Selection of stiffening configuration Comparison of stiffener geometry Stiffening spacing Structures 14 25
16 Shell structures Stiffener geometry Preferred shape depends on type of load Preferred shape depends on manufacturing method Sheet metal work (brake press forming, rolling, drawing) Extrusion Structures 15 25
17 Shell structures Stiffener geometry or adhesive bonding Z-stringer J-stringer Y-stringer I-stringer stiffening effect hat-stringer Z-stringer hat-stringer hat-stringer (Lower wing) (Upper wing) Structures 16 25
18 Shell structures Stiffener geometry Sheet geometrically reinforced by stiffeners Example stiffeners Stringers Longerons Frames Structures 17 25
19 Shell structures Stiffener intersections Stringers in combination with thickness steps (joggling) Butt-joints Doublers Intersection of stiffening elements Structures 18 25
20 Shell structures Other stiffening concepts Integral structure by machining Extra material milled away Sandwich structure face sheet Skin core face sheet Structures 19 25
21 Shell structures Other stiffening concepts Integral structure by machining low cost low part count simple blade stiffening thickness continuously adaptable lot of scrap (90%) rapid crack growth thick skin large aircraft Structures 20 25
22 Monocoque structures Stiffening concept Sandwich structure No stringers needed Smooth structure Difficult to repair Difficult to join Structures 21 25
23 Monocoque structures Stiffening concept Sandwich structure No stringers needed Smooth structure Difficult to repair Difficult to join Bending Excellent structural concept, however.. complex and expensive details corrosion (metal) and delamination (composites) problems Structures 22 25
24 Monocoque structures Stiffening concept Sandwich: Excellent structural concept, however.. Corrosion (metal) and delamination (composites) problems 1970s: Problem: Bréguet Atlantic Moisture ingress in honeycomb corrosion Structures 23 25
25 Monocoque structures Stiffening concept Sandwich: Excellent structural concept, however.. Corrosion (metal) and delamination (composites) problems March 6, 2005: Airbus A Air Transat Flight 961 Problem: In-flight separation of composite rudder Structures 24 25
26 Summary Aircraft & spacecraft structures Shell structures provide function as diagonal element Can be geometrically stiffened Stiffeners Have different shapes depending on load and manufacturing Can be attached to skin sheet or milled from thick plate Sandwich panels Face sheets carry tension/compression loads Core carries the shear load Structures 25 25
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