Aircraft Structures 3E Episode 15 doc

... 162-5 bifurcation point 156 boundary conditions 155 buckling load for a pin-ended column buckling modes 154 critical slenderness ratio 156 definition of buckling load 153 eccentrically loaded ... equilibrium state 153 polar second moment of area of a thin-walled column 184 reduced elastic modulus 159 slenderness ratio 155 Southwell plot 162 tangent modulus 157 , 159 44...

Ngày tải lên: 13/08/2014, 16:21

... the life of the aircraft in terms of flights is Nflighr = l/l)total 8.7.5 Crack propagation (8.60) (8.61) We have seen that the concept of fail-safe structures in aircraft construction ... complete aircraft less tailplane) based on wing area is C,, = -0.032. Geometric data are given in Fig. P.8.8. During a steady glide with zero thrust at 250m/s EAS in which CL =...

Ngày tải lên: 13/08/2014, 16:21

... x-(l-v)yxy=- 2(1 +v)rx1' 7.y = - 1-v2 2 Thus 2ooooo x (-0.0 015) 7;cr = 2( 1 + 0.3) rxy = - 115. 4N/mm2 i.e. The application of the finite element method to three-dimensional ... of the analysis of two-dimensional structures. The basic three-dimensional elements are the tetrahedron and the rectangular prism, both shown in Fig. 12 .15. The tetrahedron has four nod...

Ngày tải lên: 13/08/2014, 16:21

... (4.16) so, mass 150 x m3 1 200 volume = - = P 150 x 10-3 x 109 1 200 XR~H = = 1.77 mm 150 x 106 H= a x 1200 x (150 )2 = 19 s 3 x 104 x (150 x - 3qv2 Also ... Calendering, 313, 315 Capillary viscometer 369 Carbon fibres, 28, 39, 168, 181, 189, Carreau, 352 Celluloid, 2 Cellulose, 1 Centrifugal casting, 337 Charpy impact, 152 , 155 , 1...

Ngày tải lên: 13/08/2014, 09:20

... Broddle of British Aerospace for supplying photographs and drawings of aircraft structures. T.H.G. Megson 1989 Aircraft Structures for engineering students viii Contents 10.3 Wings 10.4 ... 6.13 Tension field beams References Problems Part I1 Aircraft Structures 7 Principles of stressed skin construction 7.1 Materials of aircraft construction 7.2 Loads on struct...

Ngày tải lên: 13/08/2014, 16:21

... components of shear stress are r2, = rZx1 + rzyrn, rzs = rzyl - rzxm (3 .15) Comparing the first of Eqs (3 .15) with Eq. (3.14) we see that the normal shear stress is zero so that ... surface strains 29 Fig. 1.1 5 Strain gauge rosette. the form of a rosette, as shown in Fig. 1 .15. Suppose that are the principal strains at the point, then if E,, &b and E, a...

Ngày tải lên: 13/08/2014, 16:21

... are ignored but may be calculated when required for particular cases. Of greater interest in aircraft structures is the calculation of the deflections produced by the large shear stresses experienced ... Eq. (i) gives A, i.e. Although braced beams are still found in modern light aircraft in the form of braced wing structures a much more common structural component is the ring f...

Ngày tải lên: 13/08/2014, 16:21

... the equilibrium of Problems 115 obey a non-linear elastic stress-strain law given by E=T[l+ (31 E where r is the stress corresponding to strain E. Bars 15, 45 and 23 each have a cross- ... in Fig. 5 .15( a). The compressive load on this strip is N,Sy and due to the bending of the plate the horizontal length of the strip decreases by an amount A, as shown in Fig. 5 .15( b...

Ngày tải lên: 13/08/2014, 16:21

... range between the local and primary modes, failure occurs through a 6.2 Inelastic buckling 159 or E,=E +EtT I1 I2 I (6.16) where E, is known as the reduced modulus, gives d2v d22 ... apply there still remains the difficulty of deciding which should be used for design purposes. 154 Structural instability so that the differential equation of bending of the column is d2v .....

Ngày tải lên: 13/08/2014, 16:21

... rocket aircraft, the X -15, capable of speeds of the order of Mach 5-6. The use of titanium alloys increased significantly in the 198Os, particularly in the construction of combat aircraft ... control rizontal tail countering e aircraft s tendency to pitch in a vertical plane Aircraft weight Fig. 7.3 Principal aerodynamic forces on an aircraft during flight. The for...

Ngày tải lên: 13/08/2014, 16:21