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Engineering Practicum Baltimore Polytechnic Institute M. Scott A single iron rod, radius R, has a critical buckling load B and a tensile fracture force T max = T If you bond together seven such rods in the following two configurations, what will be their new failure loads? Explain your answers. a) b) 11-29-10 Drill
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Engineering Practicum Baltimore Polytechnic Institute M. Scott 1.ASTM A36 steel has an ultimate tensile strength of 400 MPa and a Young’s Modulus of 200 GPa. If you create 1 m long rods of the following configurations, what will be their critical buckling and tensile fracture loads? R = 1 cm R = 2 cm R o = 2 cm R i = 1 cm R = 1 cm Additional Problems A B C D
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Engineering Practicum Baltimore Polytechnic Institute M. Scott How would you solve for these two configurations?
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Engineering Practicum Baltimore Polytechnic Institute M. Scott 2.With a 5% uncertainty in each measured value, what is the uncertainty that propagates through your calculations to your final answers?
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Engineering Practicum Baltimore Polytechnic Institute M. Scott 3.Now at a cost of $1 per pound and a density of 7.8 g/cm 3, what is the difference in costs among the four configurations? R = 1 cm R = 2 cm R o = 10 cm R i = 7.5 cm R = 1 cm
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Engineering Practicum Baltimore Polytechnic Institute M. Scott Materials Test Wednesday Anything covered in lecture and lab A couple error/uncertainty problems Multiple choice, matching, short answer
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Engineering Practicum Baltimore Polytechnic Institute M. Scott Materials Review Objectives 1.Review major concepts from materials lecture and materials lab 2.Understand the implications of material properties and tension/compression equations on design
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Engineering Practicum Baltimore Polytechnic Institute M. Scott Review PowerPoint “U2-2 Materials 2”
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