Aluminium Design and Construction - Chapter 7 pps

... equation (7. 7): (7. 8) which becomes operative when: Non-welded outstand ß > 12.1 Welded outstand ß > 12.9 . The effect of so doing is shown by the broken curve in Figure 7. 7. Chapters 8 and ... Reserved. Figure 7. 4 Slender internal element. Stress-pattern at failure, and assumed effective section. N=non-welded, W=with edge-welds. Figure 7. 5 Slender outstand. Stress- pat...

Ngày tải lên: 22/07/2014, 18:22

... bisymmetric, radial-symmetric or skew-symmetric S coincides with G and g=0. For sections entirely composed of radiating outstand elements, such as angles and tees (‘type-R’ sections, Figure 9 .7) , S lies ... lying one side of one arm, and the result then multiplied by 2n. Figure 10. 17 Symmetric sections: (a) bisymmetric; (b) radial-symmetric; (c) skew-symmetric; (d) skew-radial-symme...

Ngày tải lên: 22/07/2014, 18:22

... research by Nethercot, Hong and others [15– 17] . The curves are compared in Figure 5 .7 on a non-dimensional plot. Actual design curves of p b against appear in Chapters 8 and 9, covering a range ... appropriate scatter-band, with a cut-off at the limiting stress for the material. Local buckling of a thin-walled cross-section, as distinct from overall buckling of the member as a whol...

Ngày tải lên: 22/07/2014, 18:22

... K=1.2 {1+ (1-e -0 .7a/r )(1-r/b) 2 } r/b > 1 K=1.2 (12.2) Other non-linear effects which become significant in fatigue are the secondary stresses in trusses, due to joint fixity, and the effects ... to in BS.8118 as ‘fatigue- quality welding’ (Section 12 .7) . 12.5.2 Friction-stir welds At the time of writing, the new friction-stir process is being actively developed, and there are...

Ngày tải lên: 22/07/2014, 18:22

... parent metal, and k z1 = softening factor (Section 6.4.1). For the non-heat-treatable alloys it is found from: p f =0.5(f oo +f uo ) (11.18b) where f oo and f uo are the proof and ultimate of ... already been covered under member design in Chapters 8 and 9. Here we just consider A and B. 11.3.2 Basic checking procedure Looking first at the loading cases (a) and (b), the basic...

Ngày tải lên: 22/07/2014, 18:22

... determination of the effective block-width (b e1 or b e0 ) is explained in Sections 7. 2.3 and 7. 2.4, or in Section 7. 4 .7 for reinforced elements. Very slender outstands need special consideration ... slender outstands For a column containing very slender outstands (Section 7. 2.5), the designer must know whether it is permissible to assume an effective section that takes account o...

Ngày tải lên: 22/07/2014, 18:22

... being ineffective (Chapter 7) . For a very slender outstand element (Section 7. 2.5), as might occur in an I-beam compression flange, it is permissible to take advantage of post-buckled strength when ... elastic-perfectly plastic steel-type stress-strain curve. The effect, that the actual rounded nature of the stress-strain curve has on the moment capacity, is considered by Mazzolani in hi...

Ngày tải lên: 22/07/2014, 18:22

... material and also non-heat-treatable material there is negligible dip at A, and k z3 =k z1 . 6.4.2 Heat-treated material Table 6.1 lists proposed k z -values for MIG-welded joints in 6xxx and 7xxx-series ... equivalent curves for welds on 7xxx-series material. It is seen that A z is generally higher than for 6xxx material, the 7xxx-series S-curve coinciding with the 6xxx-series N-curve...

Ngày tải lên: 22/07/2014, 18:22

... for the fasteners used in aeronautical construction. These can be in 2xxx-series alloy (T4 or T6 temper), or in a strong 7xxx-series material such as 70 75-T6. In the USA strong fasteners in these ... 0 .7) a compromise alloy, lying between the stronger and weaker kinds of 6xxx material. Somewhat weaker than 6061. (c) Weldable 7xxx-series alloys The composition of the weldable (weaker) 7x...

Ngày tải lên: 22/07/2014, 18:22

... for non-aeronautical use are usually in the stronger kind of 6xxx-series alloy. They can be either machined from T6-condition bar-stock, or forged and then artificially aged (T8-condition). Design data ... suitable design, as for example by using a tongue -and- groove detail between mating extrusions. The clamping technique may be important in controlling the glue-line thickness. 3.6 .7...

Ngày tải lên: 22/07/2014, 18:22