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3 Pages

### hw5_S10

Course: ME 336, Spring 2010
School: University of Texas
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Word Count: 320

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336 ME Spring 2010 Unique # 17980 Prof. D. Kovar Homework #5 Due Friday, February 26 1. Two rods of steel (yield strength = 410 MPa) with a diameter of 25.0 mm are brazed using a silver-copper braze material (yield strength = 70.0 MPa) to form a very thin butt joint and then pulled in tension as shown below. a) Draw Mohrs circle of stress for a volume element located within the filler material and for a volume...

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336 ME Spring 2010 Unique # 17980 Prof. D. Kovar Homework #5 Due Friday, February 26 1. Two rods of steel (yield strength = 410 MPa) with a diameter of 25.0 mm are brazed using a silver-copper braze material (yield strength = 70.0 MPa) to form a very thin butt joint and then pulled in tension as shown below. a) Draw Mohrs circle of stress for a volume element located within the filler material and for a volume element located in the steel. Assume that, due to geometric strengthening, a triaxial stress develops in the filler with the radial stresses = 2/3 of the applied axial stress. b) What is the maximum force that this component can support without yielding. Filler Steel Steel 2. A steel tube of slightly more than 25 mm ID and wall thickness of 3 mm is inserted into and then brazed to another steel tube (uniaxial yield strength = 310 MPa) with a OD of slightly less than 25 mm and wall thickness of 3 mm using a silver-copper braze filler (uniaxial yield strength = 70 MPa). be To conservative, assume no geometric strengthening occurs. Calculate the minimum length of the lap joint (i.e. the depth of penetration of the inner tube into the outer tube) to ensure that failure does not occur in the braze filler. Assume a factor of safety of 1.5. 3. Schey 8C-3 4. A tensile specimen of Bevonium (a new, space-age, metallic alloy) is tested at less than 40% of its melting temperature. The initial specimen size is 12.68 mm wide, 3.230 mm thick, and the gage section is 50.00 mm long. The specimen is tested at a constant cross-head displacement rate of 6.000 mm/min until the load reaches 10,660 N when the gage length has increased to 60.00 mm. The test is continued until the load increases to 11,096 N when the gage length has increased 70 mm. a) Calculate the strain hardening coefficient for Bevonium at this temperature. b) Estimate the instantaneous flow stress when the gage length is increased to 80 mm. State any assumptions needed to work the problem. 1
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