Overview of Assignment-
In part one, you will be analyzing the loads, support condition, internal forces and the design of an object of your choice. In part two, you will analyze an unintended load (accidental load) on the object to determine if failure will occur.
Your specific task is the following.
- Please find an image of a component, or a structure. You may take this image yourself, or find it via web-searching. Please identify the primary material(s) in the component, and to the best of your knowledge, their mechanical behavior (e.g: ductile vs brittle, yield stress, modulus of elasticity etc).
- Take that image and draw it in SolidWorks. Do not forget the supports, i.e. if you are drawing a bridge, add the piers.
- Determine, via measurement, or referenced standards a number for the loadings on the component of structure (for example the loading on a chair with the person sitting on it is 686.7 N=(70 kg)(9.81 m/s2))
- Use the Solidworks image and draw a basic free-body diagram of whatever component you are considering. Identify the support type and number of reactions. The image should clearly show the reactions and loads on the component.
- Comment on how the loads are applied. Is the component subjected to a concentrated force or a distributed force? Is it a continuous force or occasional? Does it vary? What is the frequency and duration?
- Using the free body diagram in task 4, and the respective loads that you determine, calculate the reactions and internal forces of the component (for instance, beam internal forces are: shear, axial and moment forces). Present this information in a table or a chart/graph (and state how you found those values.)
- Using the internal forces, material properties, and the dimensions of the cross-section, calculate stress in the section (axial stress=P/A, flexural stress = M(half of depth)/(moment of inertia)).
- Find maximum elastic stress in the section at the location of the maximum internal forces. and describe whether current design is sufficient by comparing the maximum stress in the section to allowable (yield) stress. Also calculate the factor of safety (F.S.= Allowable stress/maximum elastic stress in the section).
- Consider any possible loading that you think the component is not designed for but is possible during the life of the component. Determine, via measurement, or referenced standards, a number for the accidental loading. (For instance, consider a chair; it is designed for different ranges of weights but it is not designed for jumping on it; jumping on it would cause a force of ____ on the chair in each of the legs)
- Make a new free body diagram with the accidental loading and repeat tasks 6-8 and determine the locations of failure (where would it break, how would it break?).
- Finally, if cost were not a factor, please describe and illustrate modifications to the current design that would reduce or prevent failure. These may include material modification
IN ALL STEPS, please JUSTIFY your decisions and explicitly state your assumptions using references, or ideas that you have learned in ME2350, or any other course. Please note that for the purpose of this project, it is acceptable to reference a lecture or assignment from this or a previous course.
These assignments will be graded based on the following criteria:
20% – Recognition of problem and breaking down to critical ideas
20% – Application of engineering mechanics principles
20% – Statement of Assumptions
20% – Identification and Usage of necessary values
20% – Communication, Images and Overall Presentation
Lateness: If your assignment is late (within one week), 20% will be subtracted from the grade
ME2350 Section X –
X SEMESTER – YEAR
The abstract is a concise summary of your report. It should be about eight to ten lines long and single- spaced. Write for the intended audience (think of your high school science teacher), with the goal of helping the reader decide whether the full report is worth reading. The abstract should explain the purpose and scope of the report and summarize the key findings. When summarizing findings, don’t write, “results are presented,” leaving your reader wondering what the results were. Instead, describe the results, or state what was interesting about the results. Abstracts are standalone documents, and should not refer to figures or acronyms that are found in the report. Most writers find it best to write the abstract after completing the report.
Submitted By: First Last
Group Members: Name, Name, Name
Body of the report: use subtitles wherever needed (such as mechanical properties, loads, analyzing design, etc.)
Your conclusion is a brief summary, highlighting key findings and any other significant aspects of your work. New material should never be presented in a Conclusions section. If you are introducing new material in order to support your conclusion, it is an indication that you need to revise the body of your report by including the new material there.
Presentation Guidelines For Engineering Work
Professional practice demands that work be neat, easy to read, and clear in its meaning. Engineering reports and calculations may be checked by a peer, a supervisor, or even a litigant. Moreover, a sharp presentation will make your work more respected by its readers.
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