By T.H.G. Megson
Airplane constructions for Engineering scholars is the top self contained airplane buildings direction textual content. It covers all basic topics, together with elasticity, structural research, airworthiness and aeroelasticity. Now in its fourth variation, the writer has revised and up to date the textual content all through and additional new case learn and labored instance fabric to make the textual content much more available. contains a options guide on hand to all adopting lecturers. * New association aids figuring out of the basics of structural research and emphasizes functions to aircraftstructures* New labored examples through the textual content reduction figuring out and relate recommendations to actual international functions* extra assurance contains digital paintings, pressure box beams, submit buckling habit, fabric homes, composite buildings and crack propagation* an in depth airplane layout undertaking case examine indicates the appliance of the key suggestions within the ebook* finish of bankruptcy routines and accompanying Instructor's guide at http://textbooks.elsevier.com
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Extra resources for Aircraft Structures for Engineering Students, Fourth Edition (Elsevier Aerospace Engineering)
Changes in the linear dimensions of a strained body may lead to a change in volume. Suppose that a small element of a body has dimensions δx, δy and δz. 54) The constant E/3(1 − 2ν) is known as the bulk modulus or modulus of volume expansion and is often given the symbol K. 15 Stress–strain relationships An examination of Eq. 5 since a body cannot increase in volume under pressure. Also the lateral dimensions of a body subjected to uniaxial tension cannot increase so that ν > 0. 33 below the elastic limit.
3 N/mm2 the negative sign arising from the fact that it is in the opposite direction to τxy in Fig. 8. 0 N/mm2 (acting in the direction AB) Different answers would have been obtained if the plane AB had been chosen on the opposite side of AC. 7 Principal stresses For given values of σx , σy and τxy , in other words given loading conditions, σn varies with the angle θ and will attain a maximum or minimum value when dσn /dθ = 0. From Eq. 10) Two solutions, θ and θ + π/2, are obtained from Eq. 10) so that there are two mutually perpendicular planes on which the direct stress is either a maximum or a minimum.
52) γxy = τxy 50 = = 650 × 10−6 G 76 923 Now substituting in Eq. 35) for εx , εy and γxy εI = 10−6 360 − 290 1 + (360 + 290)2 + 6502 2 2 which gives εI = 495 × 10−6 Similarly, from Eq. 36) εII = −425 × 10−6 From Eq. 5◦ The values of εI , εII and θ are veriﬁed using Mohr’s circle of strain (Fig. 17). Axes Oε and Oγ are set up and the points Q1 (360 × 10−6 , 21 × 650 × 10−6 ) and Q2 (−290 × 10−6 , − 21 × 650 × 10−6 ) located. The centre C of the circle is the intersection of Q1 Q2 and the Oε axis.