Full exam for Machine Design in the Aerospace Engineering degree programme at Politecnico di Milano. The document covers: Exercise 1 Consider a part of the crank shaft shown in Figure 1 (between AF), which lies in the plane of XOY. At point G, which is in the middle of CD , there is a force F always perpendicular to the plane of whole structure . The diameter ππ can be regarded as the dimension
Full exam for Machine Design in the Aerospace Engineering degree programme at Politecnico di Milano. The document covers: Exercise 1 Consider a part of the crank shaft shown in Figure 1 (between AF), which lies in the plane of XOY. At point G, which is in the middle of CD , there is a force F always perpendicular to the plane of whole structure . The diameter ππ can be regarded as the dimension
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Exercise 1 Consider a part of the crank shaft shown in Figure 1 (between AF), which lies in the plane of XOY. At point G, which is in the middle of CD , there is a force F always perpendicular to the plane of whole structure . The diameter ππ can be regarded as the dimension of the section for the whole structure. The H-H indicated in the Figure are the mid points of DE. Figure 1 Considering the structure is rotat ing at a constant angular speed Ο, it is required to: 1. Determine the torque T considering the application of force F. 2. Plot the diagrams of internal forces (bending, torsion, shear) for the structure considering the application of force F . 3. Perform the static assessment at section H-H. If πΉ = πΉπ‘, and πΉπ‘ = πΉπ + πΉπsinβ‘(π€π‘): 4. Perform the fatigue assessment at section H-H with the variable force F t applied . Data Loads Fatigue parameters: πΉβ‘ = 1500β‘π π2 = 0.85 πΉπ = 1500β‘π π3 = 0.85 πΉπ = 600β‘π πΎπ‘ = 1 Geometry Material: πβ‘ = β‘150β‘ππ ππ¦ = 500β‘πππ πβ‘ = β‘100β‘ππ ππππ = 600β‘πππ πβ‘ = β‘150β‘ππ ππ = 22β‘ππ Politecnico di Milano - Master of Science in Aeronautical Engineering Academic year 20 21-22 Course of Machine Design (Prof. M. Giglio) Written test 1 β July 18, 2022 NAME : SURNAME : Polimi-ID : Do not write here: 1 2 3 Total Exercise 2 The plate shown in Figure 2 is subjected to a far-field loading P. There are three through-thickness cracks: one of them is a central crack and the other two are side ones . Assuming π = π0, it is required to: 1. Identify the most critical crack: central crack or the side one . 2. Calculate the most critical lengths of the critical crack for both plastic and brittle failure and identify the most critical failure condition . Assuming P is a cyclic loading, and in each cycle ππππ₯ = π0, ππππ = ππ, it is required to: 3. Check if theβ¦
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