Tham khảo tài liệu 'bruhn - analysis and design of flight vehicles structures episode 3 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | STRENGTH DESIGN OF ROUND STREAMLINE OVAL AND SQUARE TUBING ni TENSION COMPRESSION BENDING. TORSION AND COMBINED LOADINGS. no restrictions on type arrangement of members is the lightest truss. of weight of any gusset Joints. of truss or however the goal Omit consideration plates at truss 1500 1400 1200 A I Ị 1000 lb. u 1 i i iB 4- 28 4 28 4 28 -4 - 28 -4 Fig. 6 Fig. 4 7 Same as problem 6 but Instead of a cantilever truss use a simply supported truss with supports at points A and B . 8 Fig. 5 shows a front beam and front lift strut In an externally braced monoplane. The wing beam and lift strut are In the same vertical plane. The ultimate design loads on the beam for the critical conditions are w - 50 lb. In. and w -30 lbs. per Inch. Minus means load is acting down. a Design a streamline tube to act as the lift strut. Material Is 2024-T3 aluminum alloy. b Same as a but made from alloy steel Fty - 75000. Compare the weights of the two designs. 9 Fig. 6 Illustrates the strut and wire bracing for attaching float to fuselage of a seaplane. Determine the necessary sizes for the streamline struts AC and BD for the following load conditions. Condition 1. V -32000 lbs - 8000 lbs H 3 Condition 2. V - 8000 lbs H -28000 lbs Material 2024-T3 aluminum alloy. Use c l. 10 Tube size 2 - .065 round. L 44 In. C . Material alloy steel Ftu X 95000 welded at ends. Design ultimate loads equal 22000 lb. compression and 28000 lbs. tension. Find margin of safety. 11 Same as Problem 10 but heat treated to Ftu 150000 after welding. 12 The ultimate design load If 20 000 lbs compression. L 30 In. Use c 1. Design the lightest round tube from the following materials and compare their weights. a Aluminum alloy 2Ũ24-T3 b Alloy steel Ftu 180 000 c Magnesium alloy FCy 10 000 13 Same design load as in problem 10 but design the lightest streamline tube from 2024-T3 aluminum alloy material. 14 A round tube is to carry an ultimate pure bending moment of 14000 In. lbs. Select the lightest tube .
