Embedded Files
Boundary conditions of the thin steel plate.
S-N Diagram Plot. Source: Norton, Robert L. (2010) Machine Design An Integrated Approach. Fourth edition. Upper Saddle River (NJ): Pearson Education, Inc. Chapter 2, Materials and Processes; p. 38.
Background
Background
This is an assignment for my ME-441 Computer Simulation and Analysis class. In the Computer Simulation and Analysis class ANSYS Workbench and Discovery AIM were used extensively to simulate. Instructions were provided, and sometimes the models, either from Creo Parametric or SolidWorks, were provided as well. Some assignments however need the objects to be modelled from scratch or modified before hand.
The assignment
The assignment
In this assignment, a fatigue analysis is conducted on a thin steel plate using ANSYS AIM Structural. The plate is 0.12 m in length, 0.01 m in width, and 0.0025 m in thickness. A moment of 1.5 N.m is applied at a face at one end of the plate about the z-axis, while the other end face is fixed in place. In the solver setting, large deflection is on. The structural steel's yield strength is 2.5 x 10^8 Pa. Steels typically have an endurance limit; other materials usually don't. The endurance limit occurs at the one millionth cycle.
The theoretical calculations goes:
Factor of Safety
FS = sigma_yieldpoint/sigma_computed
Damage
Damage = Design life / Available life
Results
Results
The displacement, Von Mises stress, and fatigue life, safety factor, and damage are presented below. The maximum stress shown is 1.7256 x 10^8 Pa. The Factor of Safety is 1.45 based on the FS = 2.5 x 10^8 Pa / 1.7256 x 10^8 Pa. The minimum fatigue safety factor is 0.46784 for one million cycles, meaning that it fails under fatigue loading since it is less than safety factor of 1.45. The minimum fatigue life is 34632, which is the number of cycles until the plate fails. From the fatigue life, the fatigue damage can be obtained through Damage = 1,000,000 cycles / 34,632 cycles . The fatigue life is 28.875, as seen below.
Displacement magnitude of the steel plate.
Von-Mises stress of the steel plate.
Fatigue life of the steel plate.
Fatigue safety factor of the steel plate.
Fatigue damage of the steel plate. This end is from the face that has a fixed support.
Page updated
Report abuse