Elements Of Mechanical Design Assignment
F18 Elements of Mechanical Design (ME 370) Homework 8: Due Class 15 30 Points
1.) (10 points) A bar of Cold Drawn AISI 1015 steel has the following stress state:
90 , 50 and 160 . a. Find the factors of saftey against yielding using both MSST and DET b. Plot the failure loci in the and plane on graph paper to scale*, plot the principal
stress point and draw the load line. By graphical measurement estimate both factors of safety.
c. Compare your numeric and graphical safety factor results. * feel free to use the Excel worksheet provided on Blackboard to print out graph paper after entering in the yield strength.
2.) (20 points) A pipe with the designation “200 mm Schedule 20” has an actual outside diameter of
219 mm and a wall thickness of 6.35 mm. The pipe below is made of AISI hot-rolled 1030 steel and is subjected to the loads shown and the internal pressure in the pipe of 15 MPa. Find the safety factors against yield based on DET and MSST at the highest stressed location at the section of interest. Ignore stress concentration and transverse shear stress. Plot the failure loci in the and plane on graph paper to scale*, plot the principal stress point and draw the load line.
