Shaft AD consists of three shafts AB, BC, and CD. Each porti…
Shaft AD consists of three shafts AB, BC, and CD. Each portion (AB, BC, and CD) of shaft AD is a solid circular rod with diameters and torsion loads as shown below: Given above problem, the customer of your project wants you as an FIT engineer to provide the following three part shaft analysis (each part is 5 points): Part 1: Find shaft portion with maximum torsion load. Show torsion diagram (VMT) to prove. Part 2: Find corresponding torsion stress for maximum torsion loading you found in Part A. Part 3: Does the torsion stress you found in Part 2 represent the overall maximum torsion stress in Shaft AD? If your answer is no, find overall maximum torsion stress and location in Shaft AD. If your answer is yes, explain why. Simple “yes” or “no” is not an acceptable answer to the customer. You will receive 0 credit for Part 3 without a detailed, unambiguous explanation supporting your argument for yes or no answer (explain why). Extra Credit (5 points each): Part 4: The customer being schedule, weight and cost conscious wants to further optimize shaft AD to reduce weight. Customer states that the minimum allowable shear stress is at least 150 MPa for shaft AD material (Stainless Steel: AISI 302 in Annealed Condition). Customer wants you to use a safety factor of 1.15 and not to consider other detrimental effects such as operating temperature. Provide one suggestions to reduce shaft weight, include rationale and show your work. You will receive 0 credit by simply stating a suggestion without supporting rationale (explain why). Part 5: What is the torsion load reaction at point D?
Read DetailsProblem 3 (60 Points) Landing gear on aircraft are typically…
Problem 3 (60 Points) Landing gear on aircraft are typically produced with lug and clevis joints to react aircraft landing as well as take-off loads. Lug-clevis joint at a location of interest on the landing gear is assembled together using a pre-loaded pin. Assume that the maximum axial tensile pre-load is 1 kips on the pin. Also, assume that the pin has a nominal outer diameter of 1.00 inch and has a solid uniform circular section. Joint dimensions, axial pin preload, applied clevis load from critical load case and corresponding details for lug-clevis joint are detailed below. Given problem shown above, provide following four part pin analysis (each part is 15 points): Part 1: Develop a free body for the pin, purple component shown above. Assume centered point loads instead of distributed loads for contact as an initial approximation. Clearly label your FBD – show all distances, values, points, units. Include pin’s axial tensile pre-load of 1 kips from assembly in your FBD. Part 2: Develop shear – moment diagram (VMT) for the pin, do not include pin pre-load. Part 3: Calculate overall max shear and max bending stresses (including pre-load effect) in the pin. State or show where max shear and max bending pin stresses occur (including pre-load effect). Part 4: Show the 2-D “plane-stress” state at the point with max bending pin stress. Sketch largest possible Mohr’s circle for point with max bending stress (including pre-load effect). Label circle radius, average stress, max shear stress, max principal and min principal stresses on Mohr’s Circle. Extra Credit (5 points each): Part 5: Calculate max shear and max/min principal stress angles for Part 4. Part 6: Sketch 2-D element for max principal and max shear stress. Show all values and angles. Part 7: Assume that given loading is a limit condition and that pin material allowables are Fsy = 19 ksi, Fsu = 22 ksi, Fty = 38 ksi, Ftu = 95 ksi. Calculate shear and bending (including pre-load effect) margins. Use a factor of safety of 1.15 and applied max principal and max shear stresses from Part 4. What is the minimum margin of safety for the point analyzed in part 4?
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