Lab - Threaded Fasteners and Shear Strength Lab Report Template Fall 2022-1.rev1 (1)
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Colorado State University, Fort Collins *
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251
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Mechanical Engineering
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Dec 6, 2023
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CON 251
Materials and Processing
Laboratory #
Laboratory Title
Submitted by:
Your name
Submitted to:
Dr. Fantz
Group and Lab Section
(Wednesdays 11:00-12:40 PM)
Laboratory Performed on
(e.g. January 27, 2022)
Report submitted
(e.g. February 1, 2022)
Introduction:
What were the goals of the lab, materials tested, apparatus used, and how was the experiment was
performed?
Data:
This section should include your shear test results:
Shear Strength =
Load @ Rupture
2X Cross Sectional Area of Bolt
Note 1:
The shear strength of a fastener is equal to approximately 80% of its rated tensile strength value.
Note:2
Cross sectional areas through the threads are:
Area of a ¼-20 UNC: 0.0318 sq. in.
Area of a ¼-28 UNF is 0.0364 sq. in.
Sample #1 Type and Grade
1 & 2
or
A307 Carriage Bolt
Area
Peak Load at Rupture
Shear Strength
psi.
Listed Tensile Strength of this fastener
ksi
Approximated shear strength value
ksi
Sample #2 Type and Grade
Grade 5
or A325
Area
Peak Load at Rupture
Shear Strength
psi.
Listed Tensile Strength of this fastener
ksi
Approximated shear strength value
ksi
Sample #3a Type and Grade
Grade 8 or A490 Through threads
Area
Peak Load at Rupture
Shear Strength
psi.
Listed Tensile Strength of this fastener
ksi
Approximated shear strength value (80% of listed tensile strength)
ksi
Sample #3b Type and Grade
Grade 8 or A490 Through Body
Area Through the body (use calipers and calculate)
Peak Load at Rupture
(Through the body)
Shear Strength
psi.
(Through the body)
Listed Tensile Strength of this fastener
ksi
Approximated shear strength value (80% of listed tensile strength)
ksi
Analysis and Discussion:
How close did your shear values agree with the approximation using 80% of tensile strength?
What is the peak load gained by using Sample #3 Screw’s body instead of the threads? How would you
use this information when ordering cap screws to attach a ½” thick bracket to an I-beam?
Conclusions:
Are your results what you expected? Do you believe there were errors in the lab that may have affected
the results? If you were to perform the lab again, what would you do differently?
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4 تسلم الأسئلة بعد الامتحان مع الدفتر
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