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ENGINEER 1P13 – Project Two:
Get a Grip
INDEPENDENT MATERIALS RESEARCH ASSIGNMENT
MATERIAL SELECTION (STAGE 1) - PROBLEM DEFINITION
Use the following information to help you in your assignment:
•
Function: The containers must securely contain a surgical tool during the tool’s
sterilization period.
•
Fixed Variable: Radius, melting temperature (100
O
C, steam)
•
Free Variable: Wall thickness
•
Objective: Must minimize cost and mass (material density and CAD)
Use the following MPI’s to select your final material:
•
Stiffness Design:
!
"#
!
•
Strength Design:
$
"#
!
Chosen Design
Chosen MPI
Objective
Stiffness Design
࠵?
࠵?࠵?
%
Minimize cost and mass
Please provide a short justification for your chosen design and MPI
.
A stiffness design would prioritize the ability of the container to resist permanent deformation after undergoing
stress. This design is critical considering the function, which states that the containers must securely contain a
surgical tool during the tools sterilization period. During this period, there is internalized pressure present which is
necessary for sterilization. Knowing this, we want the material to retain its original form while being sterilized,
therefore optimizing based on stiffness would be ideal.
ENGINEER 1P13 – Project Two:
Get a Grip
MATERIAL SELECTION (STAGE 2) - MPI AND MATERIAL
RANKING
Include a screenshot of your GRANTA graph in the text box below. The following should be
included and clearly visible in your graph:
•
X and Y axis
•
MPI slope
•
Material titles
o
The materials that you may choose from are those that are able to be 3D-
printed (i.e., materials such as ceramics and glasses should be excluded from
your database)
•
Material family bubbles
Material Ranking
Rank 1
Rank 2
Rank 3
Assigned MPI:
Stainless
Steel
Titanium
polyoxymethylene
ENGINEER 1P13 – Project Two:
Get a Grip
MATERIAL SELECTION (STAGE 3) - FINAL SELECTION
State your chosen material and justify your final selection
Chosen Material:
Stainless Steel
Discuss and justify your final selection in the space below (based on the MPI results and any other
relevant considerations)
.
Based on the MPI results stainless steel is the best material in terms of stiffness [1]. In terms of
cost, polyoxymethylene is the cheapest material but it also has the lowest longevity which is an
important factor to consider. Steel is also a relatively cheap material and will last significantly
longer, making it ideal. Steel is also significantly cheaper than titanium [2]. In terms of mass,
titanium is the lightest material which is one factor that overrides steel [1]. Knowing this, stainless
steel performs better in general in all categories, especially in terms of price. Considering that
sterilization containers most likely will be mass produced, the cost is a critical factor. Considering
everything stated above, the final chosen material is stainless steel.
References (If any):
[1] Ansys GRANTA EduPack software, ANSYS, Inc., Cambridge, UK, 2023(
www.ansys.com/materials
)
[2] R. Ahmed, “The difference between Titanium vs Steel?,” Metal Supermarkets,
https://www.metalsupermarkets.com/the-difference-between-titanium-vs-
steel/#:~:text=Steel%20is%20the%20less%20expensive,than%20steel%20per%20unit%20weight.
(accessed Nov. 27, 2023).
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