Scenario B: Figure 2 shows part of an automatic screwdriver designed to drive several million screws. The maximum torque required to drive a screw is 11.3 Nm (i.e., torque varies from 0 to 11.3 Nm). d Figure 2: Scenario B illustrating a screwdriver under the fluctuating torque Table 2: Parameter variations for scenario B. All dimensions are in mm. Case 1 Case 2 Parameter r d D Material 1.0 15 25 AISI 1095 HR Your tasks are to 1) Find the factor of fatigue safety using Goodman failure criterion. 2) Determine the largest static torque, T, the screwdriver may be subjected to using the Von Mises criterion and a factor of safety of 2. 3) Develop a matlab code that can perform the calculations for 1) and 2), regardless of the parameter variations. Changes of the variations can be done by specifying different variable values within the .m file. Interpolation of stress concentration values should be demonstrated.
The following tools / resources may be useful for you to complete the assignment:
a. Chatgpt (You may use it to learn Matlab coding or any other computer language. An
example is given here: https://shareg.pt/mXHGne9 ). Please take note that code generated
by chatgpt can be directly copied and pasted.
b. Matlab
i) Useful cheat sheet (https://n.ethz.ch/~marcokre/download/ML-CheatSheet.pdf
)
ii) Getting started with Matlab
(https://matlabacademy.mathworks.com/en/details/gettingstarted )
iii) Getting 30-day Matlab trial license
(https://www.mathworks.com/campaigns/products/trials.html )
iv) Polyfit (https://www.mathworks.com/help/matlab/ref/polyfit.html )
v) Exponential Fit (https://www.mathworks.com/matlabcentral/answers/91159-
how-do-i-fit-an-exponential-curve-to-my-data)
c. PlotDigitizer (https://plotdigitizer.sourceforge.net/ ) or a free online app that does not
requires installation (https://plotdigitizer.com/app )
You may use your own engineering judgement to make any assumptions on any “missing”
details of your scenario, provided that you state your assumption(s) and provide your
justification(s).
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