Aluminium Design and Construction - Chapter 3 potx

... temperature-indicating crayons. Minimum annealing temperatures are: 1xxx-series, 36 0°C; 3xxx-series, 400°C; 5xxx-series, 35 0°C. Copyright 1999 by Taylor & Francis Group. All Rights Reserved. 3. 7.4 ... 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-cond...

Ngày tải lên: 22/07/2014, 18:22

... 1.5, 2.0, 2.5, 3. 0, 4.0, 5.0 and 6.0 mm. Most sheet is produced in non-heat-treatable material (1xxx, 3xxx, 5xxx), and is supplied in a stated temper (such as ‘quarter-hard’, ‘half- hard’) with ... Cold-reduced strip is roll-formed to a circular shape and then fed past a welding head to produce the final product. Such tube is produced in long lengths from non-heat-treatable coiled str...

Ngày tải lên: 22/07/2014, 18:22

... Table 12 .3 or 12.4) may be valid, the designer must specify fatigue-quality welding and state the necessary level of inspection (Section 3. 3.5). The drawings should be marked with a ‘Fat-number’, ... of fatigue details (arc-welded) —propagation through weld Notes. 1. For cases 34 37 the ends of the weld must be ground flush, using run-on and run-off plates. 2. For case 35 the class...

Ngày tải lên: 22/07/2014, 18:22

... 25°C. 3. Columns 3 and 4 give the room temperature curing time to achieve =1 and =10 N/mm 2 , when tested at 23 C. 4. Columns 5 and 6 give typical average strengths when tested at 23 C and 80°C, ... 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), th...

Ngày tải lên: 22/07/2014, 18:22

... becomes: (10.23b) Table 10 .3 Shear-centre position and warping factor for certain conventional sections Notes. 1.Refer to Figure 10.12 for section details. 2. For sections C1 and Z1 symbol f=Dt/BT. 3. I xx ... giving w ° =0. In all other cases, w ° is non-zero and must be calculated. Figure 10.16 compares the warping of an I-section (bisymmetric) and a zed (skew-symmetric). With...

Ngày tải lên: 22/07/2014, 18:22

... except in the case of the unequal angles SA3 and SA4. 2. Channel and top-hat sections. The shapes covered and the notation, are shown in Figure 9. 13. For all of these t is calculated from the ... convenient nomogram: x 3 -3 x 2+ Ax-B=0 (9.15) where 9.6.9 Torsional buckling of struts containing very slender outstands When the section contains very slender outstands (Section...

Ngày tải lên: 22/07/2014, 18:22

... based on expression (8.6) can be as much as 36 % too low for the fully compact case and 39 % too low for semi-compact. 8 .3 SHEAR FORCE RESISTANCE 8 .3. 1 Necessary checks We now consider the resistance ... p v1 =buckling stress without tension-field action (Figure 8.11), and v 2 =tension-field parameter (Section 8 .3. 6). The section of the end-post must be adequate to resist M and...

Ngày tải lên: 22/07/2014, 18:22

... element. Stress-pattern at failure, and assumed effective section. N=non-welded, W=with edge-welds. Figure 7.5 Slender outstand. Stress- pattern at failure, and assumed effective section. N=non-welded, ... 7.1 .3) . The pattern for outstands is similar, but with a different ß-scale (about one-third). The scatter shown in the figure results from random effects including initial out-of-flat...

Ngày tải lên: 22/07/2014, 18:22

... 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 alloys. These have generally ... roughly taken as: 6xxx-series alloys 3 days 7xxx-series alloys 30 days If heat-treated material is held significantly below 10°C, the recovery time will be longer. On th...

Ngày tải lên: 22/07/2014, 18:22

... 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 whole, is covered in Chapter ... (4 .3) . For the stress p a , we generally follow the British Standard and take the mean of proof and ultimate stress (although some codes take p a =f u ). Again, there is a...

Ngày tải lên: 22/07/2014, 18:22