Subject: Design of Machine . Using the book of Juvinall, R.C., and Marshek, K.M. (2011), Fundamentals of
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Subject: Design of Machine. Using the book of Juvinall, R.C., and Marshek, K.M. (2011), Fundamentals of Machine Component Design, 5th ed., John Wiley and Sons. complete the following problem. subject its rivets and welding.
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Part II. For the case shown, let Sy = 330 MPa and use a Safety Factor, S.F. = 3. Determine the following: y a. Is this a torsion or a bending case? b. Which stresses apply (see list below)? 350mm 80mm C. Determine the centroid of the weld group. X = EXA ΣΑ ΣΑ Bracket 14 0m d. For the weld group, calculate Ix, ly, and J around the centroid of the weld group. 80 mm JWELD GROUP = > (Ix WELD + ly WELD ) GROUP P=0.01 MN GROUP and (Ix) WELD = GROUP EEACH (Ix. + Ad²) [For ly, simply change "x" for "y"] WELD e. Transfer the load from the hole to the centroid of the weld group as "a force and a moment". Show a sketch of how you calculated it. f. Which is the critical point in the weld? Why is it the critical point? Calculate the distance "r" (and components) from the centroid of the weld group to the critical point g. Determine the required stresses for this case at the critical point (formulas available in the list of options below). Draw them on a sketch with arrows to specify directions. h. Find the total stress (resultant) at the critical point of the weld that will be applied as a shear to the throat of the weld using the simplified von Mises failure criterion. Use the simplified von Mises criterion of failure to determine the throat size "t". j. Calculate the weld leg size "h" by trigonometry. i. k. Specify the weld leg size "h" that you would use in a drawing given to a welder. Options of potential stresses that may apply: 1. Uniaxial normal stress: o = F/A (out-of-plane) (in-plane) (in-plane) 4. Bending normal stress: o = Mc/I (out-of-plane) 2. Direct shear stress: T = F/A 3. Torsional shear stress: T = Tr/J Part II. For the case shown, let Sy = 330 MPa and use a Safety Factor, S.F. = 3. Determine the following: y a. Is this a torsion or a bending case? b. Which stresses apply (see list below)? 350mm 80mm C. Determine the centroid of the weld group. X = EXA ΣΑ ΣΑ Bracket 14 0m d. For the weld group, calculate Ix, ly, and J around the centroid of the weld group. 80 mm JWELD GROUP = > (Ix WELD + ly WELD ) GROUP P=0.01 MN GROUP and (Ix) WELD = GROUP EEACH (Ix. + Ad²) [For ly, simply change "x" for "y"] WELD e. Transfer the load from the hole to the centroid of the weld group as "a force and a moment". Show a sketch of how you calculated it. f. Which is the critical point in the weld? Why is it the critical point? Calculate the distance "r" (and components) from the centroid of the weld group to the critical point g. Determine the required stresses for this case at the critical point (formulas available in the list of options below). Draw them on a sketch with arrows to specify directions. h. Find the total stress (resultant) at the critical point of the weld that will be applied as a shear to the throat of the weld using the simplified von Mises failure criterion. Use the simplified von Mises criterion of failure to determine the throat size "t". j. Calculate the weld leg size "h" by trigonometry. i. k. Specify the weld leg size "h" that you would use in a drawing given to a welder. Options of potential stresses that may apply: 1. Uniaxial normal stress: o = F/A (out-of-plane) (in-plane) (in-plane) 4. Bending normal stress: o = Mc/I (out-of-plane) 2. Direct shear stress: T = F/A 3. Torsional shear stress: T = Tr/J
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