tailieunhanh - Fundamentals of Machine Compon Part 11

Tham khảo tài liệu 'fundamentals of machine compon part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | SOLUTION Known Two steel plates with Sy 425 MPa are butt welded together with E70 series welding rods. The weld length is known. Find Determine the maximum tensile load that can be applied to the joint with a safety factor of 3. Analysis 1 .From Section the weld rod has a yield sưength of sv 70 - 12 ksi 6 89 MPa MPa y ksi Since 425 the weld should yield first. 2. With the assumed 100 efficiency the maximum tensile load that can be applied is SyA X IO6 m 203 B kN SF 3 11-1 SOLUTION Known Two steel plates are butt welded using E60 series welding rods. The safety factor is 3. Find Determine the tensile load that can be applied to the plates per inch of welded plate width. Assumption The weld efficiency is 100 . Analysis 1. From Section the weld rod has a yield sữength of Sy 60 - 12 ksi 48 ksi. Since 48 ksi is less than Sy of the plates the weld will yield first. 2. With the assumed 100 efficiency c _ SyA _ 48 000 psi in. L F SF------------- 3 ----------- 3. The maximum tensile load per inch of weld is F L 8000 Ib in. Comment The load that the plate can carry per inch of length is given by F SyA 52 500 26 250 lb which significantly exceeds that of the weld. 11-2 SOLUTION Known Two steel plates are welded with a convex fillet weld. Find Estimate the static load F that can be carried by the joint. Assumptions 1. The plates themselves do not fail shear failure occurs in the weld throat area. 2. The throat length is given by t h. 3. The weld efficiency is 100 . Analysis 1. With the assumed throat length t h the weld throat area is 5 100 mm2 for the two welds. 2. The weld throat area is stressed in shear. Using the distortion-energy theory Ssy Sy 203 MPa. 3. F SsyA SF 203 3 23 920 N or kN Comment If the top plate has a cross-sectional area A 40 7 280 mm2 then the load capacity of the plate is F SyA 350 280 98 kN which significantly exceeds that of the weld . the

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